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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 from one point in space to another. Make a c9t*l54gk ad1:kmbfdiomparison between the displacement and the gm1t 59*dlfk:ki a4bd 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 equalhr7*uxq o ok,hj vj 40if1-fow: wxl2- to the instantaneous velocity?

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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 zerosj.4g q dhmf- k4ct19237ie:eccglor to sixty in 8 s". This is as 3ico7 -qjk ct.:ecehdr2gg9lmf144 description 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 thexg8eaf (f r4p9rl ,qul3: /dli +x 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 (+xn.v kbc+- o1au rwiam.*u ,j(m direction) begins to slow down as it appa* + bnkorau i-m1u,cj w.(v.mroaches a traffic light. Make a statement 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 traveling to thv0 s3 v c09 5ns*juzn9bcatrh-e West (-x direction) begins to slow down as it approaches a traffic light. Makejs9rvas0 nnct0 3 5*u-vhbzc9 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 is moving with a jso08bvor h.-b(mm*i constant velocity. Make a statement concerning its accelerav(hb *b-.jom8rismo 0 tion.

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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 mean that the acxk2;q+u8f0tbf r6by eceleration is zero? Support 6b ; +2rfqyetbk8fx0u your answer with an example.

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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 ib4o g9ii 9 x5*tvxc)excdyi(3s constant? Support your answer with an e 5ixixty3xc)(4cdb egv*9o i9xample.

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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 isaj5x :8gz9 o(1foktq7h v /xyno ky5n0 moving with constant acceleration. Make a statement conc1v fn08x5jozyoa5 tog:y(q /7k 9nk xherning its 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 while imbc89hp :vw ) : l,q8lkl5 b,ofiuvvfr3 3yp8cts acceleration is decreasing? Support your answepu)vv,lrf8 83: l kp vb3yfc h:,o9ci58q wblmr with 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 a-e8 gj qltvg(-long a smooth hill of ice. Make a statement concerning its accelerat-l gvqg(8j-e tion.

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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 velocity equal to the alm7f .s,rqah81/hfl e verage of the object's initial and fi1h,.elf/ 8hmqla srf7 nal 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 start at rest. They both accele2m7xv,p6a s2/t ewdwyrate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to thaty2t e/,wsx2 7 mapdwv6 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 accelerate at the same rate. H2)gf w.uxbi7 wowever, object A accelerates for twice the time fw u.bw2xi7g)as object B. What is the distance traveled by object A compared 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 fro8-c txt88b3qb.h nxjk oe) kp4m rest and falls in the absence of friction, which ojk.)8kpx -c8 8ohe34qbttxbnf the 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 f05 af/hg-czkmtm.-p v3u) 5:uen7:lfgm eyvsrom rest and falls in the absence of friction, which of the followf7vygt :) .guvf s- 3m/ u-phmee:0mcz5al5n king 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 about thdqe/ :g/w3rmp e velocity and the acceleration when t //dw3:peqgrmhe ball 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 beforepl jf41 ,ekrau f56 myya()-9j8lrptu it reaches its hightfp9m54 ar8 jfy),1ayjpr- uu el(l6kest 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 it+l ahun-- +bukw*eojl+5pd+rs initial height. Make a statement about the direction of the velocity and acceleration as the bar-n u+u*wh delk+-pjo l+a+ b5ll 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, rc-nbaa7bw;c )eaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as tbcca7 bw);-na he 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 absencuxu7x1uynz v96mxl+ 4e of air resistance. Make a statementn6m+uzu41u yxv xx l97 concerning 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 high-flying plane. What is her acgve.xbu 52peb, vd8t 46wko,cceleration when she she reaches terminal veloct k.vb52evpe6w4xboc, , ud8gity?

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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 o9 z+au)+pkozwith a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)kaz ++9opzou )

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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 tf89q 5yvb 0yczop of a building. One second later, ball B is dropped from the same building. As time progresses, the distance betw9q vbc8y5 f0yzeen 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 building. One sec f;jaoa meyhm; d,uz*hqw/v( h: r(d88ond later, ball B is dropped from the same building. As time progresses, the difference ;qd dy/ wr fh:*,hou zv8(ea(mj 8mh;ain 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. One is thrown upgpnj jkzl r356w4o 2m., and the other is thrown down, both with the same initial speed. Whatowzjkj3l6 nmg2r 5p.4 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 a building. Am20, ejt2 w-bdls0ppg second brick is thrown straight downg2pelt ,w pj00m-s2bd 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 velo2mxyee87 juayr w2 i:9yk0 c;ncity in the +x axis. The position versus time iyu08e j2c2; xemy:ykr7a wn9graph of this 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 no5b:6f1s 7* jyvqfcy kon-zero acceleration in the +x axis. The position versus tif: okc5y f1 y67bvqj*sme graph 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 o *, a uo79bvrzxrfulg8jqp8,e n 9)x-constant non-zero velocity in the +x axis. The velocity versus time grapgv7ur9)a x *enbjlu- orfq, 889pxz,oh of this object is

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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-zea e-l86qw1 evtro acceleration in the +x axis. The velocit avqt681wele- y versus time graph of this object 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 time ggx6 u3 +u 5wsjzdxw-1qraph 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 versus time graph giv/xq8m-bf;xn7hv9)u pbw v6 wmes

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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 acceleration versus time gdx//m-zp.s-s1cghnr7f ih o 9 +p -/tw in0eisraph 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 w( b87 aws1l ip69ktzc,p3ebssdyu2 4velocity 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 versus time graph of an object is a horizontal finj- iz t)m6oq6c5f6line, the object fiq- toj f6 56z6m)nciis

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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 line, the object isz rh(: xpwx6e6b/d 5siezdhx6 p rxw:6s(b/i 5

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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 of an obj)p: *p6 vq.(zxkwbh(;dbs or nect is a horizontal line, the object *):o sw6xbnhk(b dr;pz qp.( vis

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity versus time graph of an objecdfl9w ei :z5t9t is a straight line making an angle of 30 degrees with the time axis, ze9i59 l tdw:fthe 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 northv *hykn +:cgvnt.q6b(kazpl.bqwy bqm 853* , and then 11.0 m south. Find both the distance traveled . ( 6glt qa8 y:.pbbkkvwnn3,5y m**zvcq+qbh and the 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 30 km/h in still t7jvzbh z2/43s( ij we6ld1lt water. How long will it take to move 12 km upstream in a river flowing 6.0 i2 j4z/evj1(d w 6lshtbl7z3tkm/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 = pjd(-q l41bhtqsf+*tmar 0a7 1609 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 ave 3fgcxhg)3: ctrage speed in order 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 (approximately 42.0 km) in 2 hours and 57 min. Whatrk ousv5-+y9s-n /x 5 /gds6du1jrwzm is the average speed of the runnrzos5ss 6vu+- 1nk 59 xgyj/mw/dur-der 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 travey2.k wh-aya: e*1amyhg a ..pol 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 dizfpxev eu 749 4j z )zh7+/wa,okfp)wastance that light travels in one year. The speed of light is 3.00 x 108 m/s. How many7/jx pzwpueozffz, kh+ ))97wav ae44 miles 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 anb ( dcp/mojxgc zye):at e,q:b856wg4 d you look to the side for 4.0 s, how far do you travel during this inattentive period? tedj/ g58 cbaex p:)z6(ygb,owcmq :4

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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 a2 9as bl8qeh*mfwrro 0q3 v+d dda4c0/n outdoor track (400 m), in 100 s, your average velocity4a03rvb+hqw oc90qdr s*8eda /f m2 dl 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. It travels 1.0 km south, theuy*y pu0zfn 87n 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's aveu78uy*0pn y fzrage 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 uncp,d6g v(e.km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's .gvpc,n( 6deu 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 weekend from school at 55 mi/h for 110 miles. It thf)qutw;3( mrpl 145 v2ejihrhen starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How fwr5 hu p2t1 q)fv3mlie4h (r;jar is your hometown from school?

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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/h and 160 km at 100 km/h. Whatv(,qz +it.ts f is the average vi , qft+zt.s(speed of 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.-e3*aehs6 wdw-t( ca4jr cs,l7m,ky t0 h at 100 km/h. What is her average speelar(w4tc -7smk sw3ha 6 ,et,eyd*cj-d for 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 d5kgax7rr4lzq,ic90 hen at 250 mi/h north for 750 miles. What is the average speed for th0rz gdq4,7 ac9xi kl5re 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 race the anchorman (the person who runs thu mhsjz +uwuq:*0my*qz1w t87 e last 100 m) for team A can run 100 z1u j8m:h s*qmyuu w z+t7wq0*m in 9.8 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 a stop after 10 s. The car'sihe b ls5lzq1* 8fdk0u/8fot ) average velocity during deceleration was 50 km/h. What was the car's deceleration while sl0o1fb sdllt5)fuh8z8k*e/qi owing 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 13f9y4*cq imrg 00 m/s to 160 m/s, at the average rate of yr9 cmq3gfi* 4$15 \; m/s^2$. 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 acceleratesk.h phczuwf1d8 levh )5) g,m1cm8*hn at the rate of $2.0 \; m/s^2$. 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 rn(2;rw pkd)4( t*jwis qkcl(xest and accelerates 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 then speeds up .w k3dc 54h voku5 b*r;whh8oqwith a constant acceleratiohwhc 3 5k.qwo db84* hk5uvr;on of $2.0 \; m/s^2$ 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 experiences a constant acceleration v0zw+f1:k)jpp(vw.pq x7c dv of v+kv7(pfvwjpdwc 0qx.1 zp:)$2.0 \; m/s^2$. 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 right (+x directiq9fr rh)b c 5i0;)pzfvon) with a speed of 500 m/s strikes a sandbag and penetratesfv c5qhf;iz 0r9r))pb a 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 lausimb1cp0fe)0 a - z*sunched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the0-p*mau1cis0fb )s ze 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 rest moves with constant acc)z kgk)nw3pm* eleration 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 mb- zmro0a1i-b 52kiqg . What is its average accelerka z--i 12obmi50gbqration?

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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 rest 5;xkdi.fh7f ij4)omzq r95 czfm:fb93rrmt- and undergoes uniform acceleration. During the first second it travels 5.0 m. .mimk 4m5i-:dx5rh qrcrf 3zt )f9j9fzo7;fb How far will it travel during the third second?

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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 kq )log16plbue 5pt+vc8xqbd p(7*:r constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is travd 8e7qo qbvtbl )lp uprp(x:16ck+* g5eling at 10 m/s. How far does it move during 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 acce nsmdy.3ev.g 4lerates uniformly 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 tires (:byqi1fi ev*r oq:c yft 9,t8on 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 turns green, a car that qv ztu(n470ed8; xiic9ohue*has been waiting at the interseivdcz7nox; t(uu*h9eei084q ction starts ahead with a 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 with a speed of 12 m/s on the surface o(yfvfgr/ pxn .g:bq /+f planet X where the acceleratio :npqyf+fg /b v.g(r/xn due to gravity is $1.5 \; m/s^2$. 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 129 1+*;:luh4o3lq6wkjtwamh wj8fi rj m/s on the surface of planet X where the accetr f9 jwwhh:k8* j4q6m j awloiul+;31leration 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 sp/jg5 pn +fl(mceed of 15 m/s on the surface of planet X where the acceleration duep gnjl/m5(f+c 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 xlhh0xu5yro) n :tu3) hwqw( .upward with a speed of 14 m/s on the surface of planet X where the accel) h.xy 5twr xlqhuu3o(0n)wh:eration 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 friend holds a rcy cp +ugrke(. 6rs7o/x ;qwx.uler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch itc(re7. urxc./ w ;sxgpk6+qyo?

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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 at a velocity of 19.6 m/s. What is its veloci6n:f7aku4k.seonejc ;wf; i(c o0f 2 rty after 3.00 c;6kwf4f 7 2s0.o k;j(unceoiena:r fs?

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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 d*z wu/h8 2o /zoz*+ne.gp tuoto its starting point in 10 s. What is the initial speed of the /ugt/ whnzz o2.* dz+p*ouoe8bullet?

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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 ) -v ymjf5xi4ovk;dj 2up with a speed of 36.0 m/s. How long does it take to return to its sta j- v5x;fj)v24 odkiymrting 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 the top of a building wif b95u5s f-kvkxu6 *nyth an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high is the buixv5*n9fu6 u -bsy f5kklding?

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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 30 m/s. (only fill in numericalj.4s; mrw hr0a value in the rr0hj;4asw.mblanks)
(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 speed of 30.0 m/s. i,r .um vjd*7/sqo(o 38jsoz i(only fill in numerical value in thdo/u.(3qjvs ijm*r 8,zis oo7 e 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 vek6c c:5e lt:rylocity 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 thnw 4ufw28z. 7 lpmxtb1e 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 velocity a7ych vgkl ,r/ 8j2csi9/kvc h+t 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 the velocity at t = 5.5 s?xn1 vr 904nhmx


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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 exv vrcq4ptec) z83gnf44+ 5 wfrom 0 to 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 average velocity fr c8nrevf7 f24b(k2)ei soozbna) (ck1om 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 w8m1:k dl:5qx8(:a i2fl k k(num ftdj1.0 s?


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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 th*d ob.l1sew:b8knx /ee acceleration 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 from 0d 0hkjlbw) xk+ 83hb o.cd8+bt 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 the average acceleration from 0+qe(jlg v3 td,xshh(* 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 the displa* )qm2l*6csxp)go g4jdm0 q b)s ex(bocement from 0 to 8.0 s?


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