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习题练习:Physics Unit2: Kinematics One Dimensional Motion

 作者: physics   总分: 98分  得分: _____________

答题人: 游客未登录  开始时间: 22年07月19日 23:10  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object travels ksf a 2u3-d +l6gn8b5vw pukz-from one point in space to another. Make a comparison between the displa38pkbskunufa+ l 5d-g62vz-wcement and the distance traveled.

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When is the average velocity of an object equal to the instantaneous velo2 nyh5:u5eoqvgyn89 rcity?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A new car manufacturer advertises that their car can go "from zero to six mv3;g- axnq8pty in 8 s". This is a descp8q3vn ;x-mg aription of

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object moving in the +g )tum h92bpkek6t( h9x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a car traveling to the East (+x direcxhn-pi8nb x6 v:v(h axud46dz31 7drtw:pt 4ltion) begins to slow down as it approaches a traffic light. Make a statementz:n4w 6(4:p 1vr8b6 du3phi-hdaldvtxxn7 t x concerning its acceleration.

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a car travelingyi 2p*,xhd,i ;(yk -j ;erczbx*;cqby to the West (-x direction) begins to slow down as it approaches a traffic lig h,iy;e(y;;xp*bbdqickz *j cr -,xy2ht. Make a statement concerning its acceleration.

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object 3e cr n7xj;gv (unm7g2is moving with a constant velocity. Make a statement concerning its jc3nem;u n ( 2r7gg7vxacceleration.

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity of an object is zero, does it z *2lhdn8i5ak mean that the acceleration is zero? Support your answer with an example.2h5kl 8*ia nzd

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can an object's velocity change direction when its acceleration 1y(whxw*.qh i crrz49 is constant? Support your r. 9c4 x*rwh1yzhiq( wanswer with an example.

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object is moving with constan:q;nl-p u54s .;l +rxtdkqinxt acceleration. Make a statement concerning l 4x;qt-nspul;:rx+.k qd 5niits motion with respect to time.

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can an object have increasing speed whilenh +dvhkux,g+m: )*oy its acceleration is decreasing? Support your answer wiv:)xm*ky +g uho+,hnd th an example.

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a can, after an initial kick, moves up aloc,u2ue6, xkgh7 m(f2/lecwe. .aa ddzng a smooth hill of ice. Make a statement concerniehdx76/l dc2uu aec, ke wzf.am(,g2.ng its acceleration.

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Under what condition is average velo,l9hqzfyllw j; )g. l7rwg7 5ccity equal to the average of the object's initi5yfj,;9wwq.7hcg g7z ) llllr al and final velocity?

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Objects A and B both stajl .5l- mfm.b skfu:qlm9 f5x7rt at rest. They both accelerate at the same rate. However, object A acceleratef5- ljfm9mf5.l:bms l 7.k quxs for twice the time as object B. What is the final speed of object A compared to that of object B?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Objects A and B both start from rest. They both acc f3jke+)ad. nbl h(mb,elerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A comnhae (+) .kbjl fm3,dbpared to that of object B?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When an object is released from rest and falls in tvid1y4 fz4;be he absence of friction, which of d ziyb1 ;44efvthe following is true concerning its motion?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When an object is released from rest and falls in the absence of fricihx xu0 (v7k/ktion, which ofv kih7xx(0uk / the following is true concerning its motion?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up. Make a statement abo *jqlge3:7bhc ut the velocity and the acceleration when the be*7qg3hl jb:c all reaches the highest point.

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up. What is its acceleration just beforl:z 6t6qxpn 6 vy6m3b+m+ yzdue it reaches its hig6 6:6yxzmv+bzqud3n pl +m t6yhest point?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up, reaches a maximum height, then falls to it0 a rkf.898pi2ik xv 4a qg/dnbl/jhi0s initial height. Make a statement about the direction of the velociji/8g9rab d/aqikp vh804 i.n2x fk0l ty and acceleration as the ball is going up.

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up, reache*pe3nf/kp hmb5d:+d h s a maximum height, then falls to its initial height. Make a statement ad5hk+m/ ep*fhdnp : 3bbout the direction of the velocity and acceleration as the ball is coming down.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown downward in the absence of airju7 qq6)gvu jlln b8 ;:.eym3s resistance. Make a statement conce 8 e63nql)gj 7juvylu. bmq:;srning its acceleration.

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a skydiver jumps from a hig)9fyz/: nqn1bxkdp z. h-flying plane. What is her acceleration when bzpnf1ny xd.q:z)9 /kshe she reaches terminal velocity?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown vertically upward with a speed v. mf 5d17(qat1:v(5 i(p*o(xy nbc edhmxjcmn;An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the secx1ma1vbmt5m (:( odcy( nn*f;5xpehjd iq7 (cond ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Ball A is dropped from the top oft(,pk pxcv66 uw7uu y) a building. One second later, ball B is dropped from the same building. As time 7wuuuv6y)x,tpk ( p6cprogresses, the distance between them

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Ball A is dropped from the top of a build.v(8rveu :q ys)ezhp)f; mzk3ing. One second later, ball B is dropped from the same building. As time progresses, the ;mz 3.vp ruve))e:8zhf(q ys kdifference in their speeds

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two objects are thrown from the top of a tall building.at. vt)mr m*6b One is thrown up, and the other is thrown down, both with the samev *ta)r .tbmm6 initial speed. What are their speeds when they hit the street?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A brick is dropped from the top of al7g: x lo -ldkr.vfy,4 building. A second brick is thrown straight dolv 4dofg-ly r.kxl7:, wn from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero velocity in the +x axks,ff ased5i d4jd 9;6is. The position versus time graph of thifk,jid9ea6df4 s sd; 5s object is

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero acceleration in the +x axi+5 )qc*, z.l r bc7;wb91x emgcxcgncms. The position versus time gracg. 5m7*rc m9e1wcgx ;qc,b)lbcz x+nph of this object is

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-*+mmpu igwntot- z, 33zero velocity in the +x axis. The velocity versus time graph of this object isgnu+wm-z3,mt3t *po i

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero accel;x:oig wk. 7iq-qf;j igxa;3oeration in the +x axis. The velocity versus time graph of this ob qfk3q;;;. :gxa jiogwi-7xoiject is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The slope of a position versus t,4 jsufqu4495 lpvr gmime graph gives

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The slope of a velocity 3 ym3.anmc .yut5e 8bsxjl)4 jversus time graph gives

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under a curve in an accn.:7f,j- x huz ;kuj9j ,wzjhhl0e yk0eleration versus time graph gives

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under a curve in a v as+ +hz,irva) apay+8elocity versus time graph gives

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versus2q9:rkheior 9 time graph of an object is a horizontal line, the object 2q h9 9keiror:is

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versus time graph of an object is a vertical l2y/jgrwe-;o+-lcv/kq lrq3 y ine, the object isyyo2/k-wvqqe crj l3;rg-+l/

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity versus time graph ofrfn oxby-zm bw(00wqn80c0 6e an object is a horizontal line, the object ie6qr000y bz(wfbco w x-nnm80s

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity versuy.(l9o ps 72-(vuu x.gcvyy gms time graph of an object is a straight line making an angle of 30 degrees with thgyou (g(cv7. ysly2.9vu xmp- e time axis, the object is

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object moves 15.0 m north and then 1u )krb-0zsd3a3: sbp 6lb 2lat1.0 m south. Find both the distance traveled and thea0 : du3 rp6)-3abk lb2zssblt magnitude of the displacement vector.

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A boat can move at 30l pp( do60oxo2ov 3gz6 km/h in still water. How long will it take to move 12 km upstream 2 o6 v36l odo0xz(gpopin a river flowing 6.0 km/h?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  55 mi/h is how many m/s? (1 mi = l ): +7+ivq13z yft3rog djczzemdj031609 m)

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What must be your average speed in ord*b/cjnfujs9 -qn:5 txr(s*( /qxpw ccer to travel 350 km in 5.15 h?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A runner ran the marathon (approximatt+pr9 mrlv6ro, os7 +zely 42.0 km) in 2 hours and 57 min. What is the average speed of the runm6sz+pr, +r lr9ov7 toner in m/s?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car travels 90 km/h. How long does it take for it to trap /c(au* cvc7zvel 400 km?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ly (light year) is the distance that light thh*wqpz 2d h,6f4nzj n7i2q5travels in one year. The speed of light is 3.00 x 108 m/s. How many mile5nztjh*f 6w7d2q hnph4iq, z2s are there in a ly? (1 mi = 1609 m, 1 yr = 365 d.)

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you are driving 72 km/h along a straight road and you look to t8m mci 8f*vntrz1(:bpdv ++ u oo4qgwqav2b(:he side for 4.0 s, how far do you trave+o t (vc2+1uvmg qprv:iq4boa* zbfm:w8(d 8nl during this inattentive period?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you run a complete loop around an outdoor track (400 m), in 1004v l9o y -gr8zkasf-s3 s, your averagf va-z-r49kssy og83le velocity is

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A polar bear starts at the North Pole. I7vgm6-j bb)5x p3w cr 47l1z*pn;hqxy gu,blj t travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting poinh *p wj q3vpug75r,gy47 xmxc) l-bjb;6z lnb1t. This trip takes 45 min. What was the bear's average speed?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A polar bear starts at the North Pole. It travels 1.0 km soue cjmw9*md(cljcm*38th, then 1.0 km east, then 1.0 km north, thene9cjm*wdl (c*c3mm j8 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are driving home on a weekenx-s7 sogz 5fwp; ha7b6d from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from schoolh 7gofa;6 7-bxw5s pzs?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motorist travels 160 km at 80 km/;o( +k bve. raajbx0r0hsvf ,/h and 160 km at 100 km/h. What is the average speed o +,;raxk hos(vvba.0r b0/fe jf the motorist for this trip?

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motorist travels for 3.0 h at 80 km/h and 2 pwg ge698zdv .(/8 s b)ywahtm.yr x8ry66sqv.0 h at 100 km/h. What is her average speed fxgtsh. v y6drve y98pswg.wzbary 86 )m 8(/q6or the trip?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane travels at 300 mi/h south for 2.00 h and t);afh0 6h4n oiorlir43+) b:zl heqfyhen at 250 mi/h north for 750 miles. What is the average speeb 3))r4a;fh fqihori:zlo4hyel+ 60nd for the trip?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a 400-m relay raco r+b hcn.7ec)e the anchorman (the person who runs the last 100 m) for team A can run 100 m in 9.8ch)n 7 .cboer+ s. His rival, the anchorman for team B, can cover 100 m in 10.1 s. What is the largest lead the team B runner can have when the team A runner starts the final leg of the race, in order that the team A runner not lose the race?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car decelerates uniformly and comes to .0b4xodr ,.yzixc6era stop after 10 s. The car's average velocity during deceleration was 50 km/h. What was the car's dexb..i6zo c40yrdr ex, celeration while slowing down?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane increases its speed from 100 m/s to 160 m/s, at the average rate om2, r oxt isrf1 00p03cvglk)cf mok0st302ixfc )c0rlr , gv1p $15 \; m/s^2$. How much time does it take for the complete increase in speed?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car traveling 60 km/h accelerates at the rate 3+unkuv;; xwsof $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cart starts from rest and accelero:req *ge8h5,:8bd s3ube cl rates at $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car travels at 15 m/s for 10 s. It t3(0jql . titp3s2zfv7-kzq/a -u+jby fnoau,hen speeds up with a constant acceleration of7bj z 2nlyz3(-/0f+utt oq3av.a-fj ,qiuskp $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cart with an initial velocity of 5.0 m/s eweuin 1- 4o5k.rauyd4 xperiences a constant acceleration ou. o4wykura- ni541 def $2.0 \; m/s^2$. What is the cart's displacement during the first 6.0 s of its motion?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bullet moving horizontally to the gx6d)g3vej/2e; hoyfwwuib)q zp4 28 right (+x direction) with a speed of 500 m/s strikes a sandbag and penetrates aw4 u)jedggevh qb 6izpw )x322 y/o;8f distance of 10.0 cm. What is the average acceleration, in $m/s^2$, of the bullet?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A jet fighter plane is launched from a catapult on an aircraft carrier. It rey/+h : vo.jklsza. ,f: l2begcn; +xjcaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the accelerataj:j:zf.+ , bcol xvs2.ge/l ykh;n c+ion is constant, what is the length of the catapult?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car starting from ren7 .nds*9 tal+mgiw1hst moves with constant acceleration of $2.0 \; m/s^2$ for 10 s, then travels with constant speed for another 10 s, and then finally slows to a stop with constant acceleration of
-$2.0 \; m/s^2$. How far does it travel?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car goes from 40 m/s to 80 m/s in a distance of 200 m. What is its averageq3 r3 24k7afew50wyfnk-kr nu acceleratn nu53743refyfwqk 2a0kkr -wion?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object starts from rvjm:r2)a xd*zxkdw*h h60df: qb k3s;est and undergoes uniform acceleration. During the first second it travels 5.0 m. How far will it travel during the third secmw;6a:f*v* k:)kj20bddhx zqx hr 3dsond?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving in a straight line with constant acceleration. Initiallyqnp 6 6vwhb ss(yhy;;9 it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move du6y;qy6;h b w9 snvp(hsring this time?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car starts from rest and accelerates uniformly 25.+/p o okzurstcub)at $3.0 \; m/s^2$. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at $5.0 \; m/s^2$. How long does it take the second car to overtake the first car?

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70#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A car with good tire wwa,yzzb 8.ble-j2 9bs on a dry road can decelerate at about $5.0 \; m/s^2$ when braking. Suppose a car is initially traveling at 55 mi/h.
(a.) How much time does it take the car to stop?
(b.) What is the stopping distance?
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71#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
At the instant a traffic light turnsd7(udj3 qak3. kfd9js green, a car that has been waiting at the intersection starts ahead with a 9 qaj3( df7ud k3jdks.constant acceleration of $2.00 \; m/s^2$. At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.
(a.) Calculate the time necessary for the car to reach the truck.
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.
(c.) Determine the speed of the car when it passes the truck.
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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward 3 vc s-+xh2z2ljbx9vwfch 75fwith a speed of 12 m/s on the surface of planet X where the acceleration due to gravity is f xh2+hlcf v2z3-xb5v7 js9cw$1.5 \; m/s^2$. What is the maximum height reached by the object?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 12 m/s on the surface of planegeglnvr0z7gbjj/ 7 n7+w k7:ut X where the b0n:gv j+jw gu7nz77e7k/rlg acceleration due to gravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 15 m/hc20dj 2b(vgidg( if +s on the surface of planet X where thegihd+ v( cd202i(jgf b acceleration due to gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upwp95uxq5q*iec q 8 f0dhard with a speed of 14 m/s on the surface of planet X where the acc piqdq f8uh50ex9 q*c5eleration due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Human reaction time is usually greater than 0.10 s. If your frien*m z55lnky6aldxb-e ,d holds a ruler between your fingers and releases ib zd56,l a5ly-*e mknxt without warning, how far can you expect the ruler to fall before you catch it?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown upward a2gm0k1dw 26z0 8ui mal (xrcbat a velocity of 19.6 m/s. What is its velocity after 3.00 s?w8akaxr(bi m6d01 0m2gl2 ucz

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bullet shot straight up returns to its starting point iq muj7o;v t*z++ m2fzpn 10 s. What is the initial speed of the bulfz;p +v2mz7 qju*t+ molet?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up with a speed of 36.0kgr(ru4g fot;7kchmrd2j52/z7a 1i e m/s. How long does it take to re(uc24 /5htmr rrkkf ej2;o77dgzg 1aiturn to its starting point?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown downward from thi*026a;;q ny mlxs dwoe top of a building with an initial speed of 25 m/s. It strikes the ground af*lqd osm;i0ywx n 62;ater 2.0 s. How high is the building?

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81#
 
填空题 ( 3.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up with a speed of 3 1pxlfo*4 6ht0aaro:4qv/f o0 j(h qsn0 m/s. (only fill in numerical value in the 4 (p vx0t6raj*o40 : oh1fa losq/hqfnblanks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

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82#
 
填空题 ( 4.0 分) 切至整卷模式 搜藏此题  
  A foul ball is hit straight up into the air with a spfx)3oofffkyh ba+3c )h 61e a*eed of 30.0 m/s. (only fill in numerical value i)a 3f)y hoa* co6x 3f1ffhkb+en the blank)
(a.) Calculate the time required for the ball to rise to its maximum height.    $s$
(b.) Calculate the maximum height reached by the ball.    $m$
(c.) Determine the time at which the ball pass a point 25.0 m above the point of contact between the bat and ball for the first time.    $s$
(d.) Determine the time at which the ball pass a point 25.0 m above the point of contact a second time.    $s$

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the veloc9e5m lhtgs.v1j f8z ve 8i4 fgliip,57ity at t = 1.0 s?


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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is th83((u thp pq-w+ twkkh() v;ujppqsg51mgw-oe velocity at t = 2.5 s?


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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the vel) , lkbltz7g61 yase)zl9)t5uw mdf)iocity at t = 4.0 s?


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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is i8trbzp7 svx.0 k3634 jb 5s.uamggfythe velocity at t = 5.5 s?


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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the average velocity from 0 tok )elr6jzw4r*ssl7c 8bc2 k0l 4.0 s?


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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the averag5k5qpcu*d+ g)zxp u f2e velocity from 0 to 6.0 s?


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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the acceleration at 1.0 x4l6 yd.ds li8s?


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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the accelhb j-k,osws3 .eration at 3.0 s?


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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the average acceleration frombr9 u:: qjzq8m1e6c 6xj*wnvo 0 to 5.0 s?


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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the1gfy,d 4wxb :z average acceleration from 0 to 8.0 s?


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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is ty6v1 t 1 j nasjpsv)l08x:v-hwhe displacement from 0 to 8.0 s?


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