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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 selos y 06t8jn+ oh3 m4z*dbg/rpace to another. Make a comparison between the displacement and sn o8jr4l*3do0me ybgt+/h6zthe 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 velocity?o6mt t um*gfz2;9edus8o/5tibzc 3 +x

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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 gv i2sdho,tpi2 u7l+:3.vwtr go "from zero to sixty in 8 s". This is a description otws,hlvr .3d 2ivgo72ipu+: tf

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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 +x axis experiences an accelw-e;5zt tjdbx: :b.rh eration 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 diwu,z f.e u;kzzv /1b) bui2k0urection) begins to slow down as it approaches a traffic light. Make a statement concerning its accelera/,uz b;uuzfk e)ku biz1 w.02vtion.

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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 the West (-x direction) :- y7ka;owyvk begins to slow down as it approaches a traffic light. Make a statement cono -:w kvyyka7;cerning 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 constant velocity. Make a statemenyr qf ) ir3sw4da33u7nt concerning its acceleri dwf3nura)4 3q3ysr7ation.

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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,g-b.x6rfdc8 3 .eky sd does it mean that the acceleration is zero? Support your answer with s.-6kx 3c dbdy gre8f.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 whenpn ut:+h0(.i j++:ihv ugrewv its acceleration is constant? Support your i:ht.ihvw:+ rpj+g0uu v+en( answer 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 constant acceleratiq -ummvv/vk.dyd4 b-or2-3qton. Make a statement corv k.-m4dv3/byd qovq- u-mt2ncerning 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 increaak8 )q/vt9cg tsing speed while its acceleration is decreasing? Support your answer with an exam)qcvkt9/8ag tple.

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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 along a smooth hill of ice. Maku0 pn/hbj.fhc rd3 3-ee a-3jhrh.pfu c/en0 3bd statement concerning 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 velocity equal to the average of the object'sbdr8 iea hbwc hu-*+5( initi8b h+chw5*eb ai(r ud-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 start at rest. They both acsaob v: o/ *glv,yjf1/celerate at the same rate. However, object A accelerates for twice the time as object B. Whatyoalv,/1 s:gbf /vjo* 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. Thpi - 3yoghh/) zx)rn/sey both accelerate at the same rate. However, object A accelerates for t)yphg) z3s/r/ni-xohwice the time 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 rele,ko; pw dns12rased from rest and falls in the absence of friction, which of the following is2 onsw;1rdpk, 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 aqsb8dipfs3 i76e qyt2 (2e(z absence of friction, which of the following is true c t(pezs aq223i86 f i(7sybedqoncerning 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 the vel e6 srogeqs.4:ocity and the acceleration when the ball reaches the highest rso.qge 4:es6 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 acceleratio 59d y,pf9bbxcp6g0 z95kautj n just before it reaches its highest poinx 5 cpp9ybd,j65a9 0ugkfbz9t t?

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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 thyt mv8;1v lzw-rown straight up, reaches a maximum height, then falls to its initial hv 1w8zvy -tlm;eight. Make a statement about the direction of the velocity 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, reaches a maximum height, tx euz+jrbq- 7t; t4mk:hen falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming d4jtb7tq;xr : z ume+-kown.

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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 ao6eiria qqc7*c ; -x1zbsence of air resistance. Make a statement concerniq7*;roixza6 qcie1- cng 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 accelery;yp rz y 0pkcftis,y6k x8(/6gnyu8 +ation when she she reaches terminal r 6fkus+zk xyyy;80ct/8i g n ,(yp6pyvelocity?

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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 upwaxmbps u ua65qp 5a5 (oe,0ox*mrd with 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 bale55s (bp,ao5x6uq pmux amo0*l 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 of a building. One second la7-fyi;mg4)*d bbf nwcgrt( e-ter, ball B is dropped from the same building. As time progrbg- b4 7;g*nr wyc m()def-tifesses, 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 building. One second lat9g;rxsacb/ bnc8 votr+ ./ ,cger, ball B is dropped from the same building. As time progresses, the difference in their spe;cc9 ,cv/.ngb/+so gb xa8r rteds

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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(x9. x( /ronrf-llqie ot)oi a 6 :ozg*wq7h-u top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are gqo:r6(i -owt.lrax-/o*nu o9lz )h7 efi x(qtheir 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 thenit2j. 3 zo;hw top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance.32.wnhjt;ozi 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 pfv*8 4edl:g3rqrrz 2+x axis. The position versus time graph of this object ir8r:l3p2qdv* fz4re g s

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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 j)4ux. k(i(gkr-phgv the +x axis. The position.x gkv 4j)ig-(( rhpuk versus time 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 constant no3 r1tym h+svzcc-5 /v8 qsyf,yn-zero velocity in the +x axis. The velocity versus time graph of this obytv+c8 /,csqfyhs 3-1mzy v r5ject 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-zero acceleration in the +x alvlyfx 4*5gqv/ u y;fp :lz,56 fvm4uhxis. The velocity versus time graph of this o /,y*lgpf5v4xvq;6l:muvzlf5h4yu f bject 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 wftgk tm )8tfz 7:qr-5graph 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 gr v le:i4agsd(+aph 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 anmus jx+.mhj09t4 7nou acceleration 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 velocity versus time graph gi/j 0u7 y0 tm6klylt,xjves

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versurbo7posvc: c*1 l7 gu5s time graph of an object is a horizontal line, the object ic 7:rbus1o 5ov*lc 7pgs

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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:4qfzzd*nd hd 8;fc5ezwv6h; an object is a vertical line, the object is:f5dhc4d;*f z vdqnh;z6w8 ze

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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 object is a horizontal line, thewy d).uy yqkle7t30x( object ye y)(0dxky37wtl.qu is

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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 fkfrn(9j3aik2 w +x1 n:hja/ 7fspg(s time graph of an object is a straight line making an angle of 30 degrees with the time axis, the k( ak32rf(h n/sgj1wa7:fip+9f xjns 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 1hwl*4 +1wkap+s uoap71.0 m south. Find both the distance traveled and tlu* waha+kp14+p 7sow he 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 water. How long wil.o8 duv;/xm7roh5vq (miv kcbo8+i+r l it take to move 12 km upstream in a r/rv8v.vqoo h(cm5ki +xo bruim8 ; 7+diver 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 bcvdpg*1skd2p i.x73m/s? (1 mi = 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 avu,molx9q (lqiv4bnl8ha cy). s.zw0 3erage 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 ,c6erbxi 0,h-dtx/b i 2 hours and 57 min. What is the average speed of the runner in mh/dr6xci -x0 ,i,tbbe/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 t lj,yse xrmd) 0 ok1w*+,zq+tnravel 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 travebr7n0nq 10 yoxu y3,+ahe2gjuls in one year. The speed of light is 3.00 x 108 m/s. How many miles are there in a ly? (1 mi = 1609 ,70+o0ja1qux b3en ngyyu rh2 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 vw-ni8c*0fg1l7noza you look to the side for 4.0 s, how far do you travel duringozv10a*lw 78ngn c-fi 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),52ghpsjc( aw oizz ,,.gr)4ltc*n(u t in 100 s, your averagzp a24t5n(,hl.osctg*g ,iwu (c z)jr e 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 Polegi:sc57cy*nd (t.nxk,hm ,ff . It 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 point. This trip takes 4 y7csc,fikn5dng:(xm ,t.fh *5 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 south, then 1.0 bzaambz5)6y8n/ aie: 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 averaz8:az i /5mya6baeb)n ge 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. I3c69 n3(zj.1mghc c7x ewfkjlft(b.e t then starts to snow and you slow to 35 m1c jgzc9nx3jlm k(3ec w(f .6.t7befh i/h. You arrive home after driving 4 hours and 15 minutes. How far 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 bem+f)kb rs7sd56v88u +nr d nkm/h. What is the average spu8 nd+rss7)md bv8kfr+b6 e n5eed 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 2.0 h at 100 km/1dl4ok , yqsj*vm-c+z h. What is her average speed fo+4qj s-dz,okvm l 1y*cr 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 then at 250 mi/h nort99bt ,xvm/u*jk.ka vbh for 750 miles. What is the ab 9k /v,ubtj9*m.kxavverage speed 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 race the anchorman ewncd - gu5--cu8gkk5qk6e 8r(the person who runs the last 100 m) for team A can run 100 m in 9.e kc n8ukw85e5 -gq -rdc-6gku8 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 aftebbd7dvg y7q39i c2kc.r 10 s. The car's average velocity durib.7yc3 ki297bdv cd qgng deceleration was 50 km/h. What was the car's deceleration 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 of zn:eza24+ r zrnzz2ra +4rez :$15 \; m/s^2$. 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 al xaw iugs*g-t.8qw3 hlcy -16t 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 rest and s ipa+hq( 3ct7c,sk c4accelerates 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 f+sgdug7hnws5 ffs +)4oe/ ;5jev6ewwu)h+ l s. It then speeds up with a constant acceleration o;j) 7d5wuw6shese+o+fw5 f4sguhn )efg/l v +f $2.0 \; m/s^2$ 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-i5qn9n txv8i4 pgb8m.0 m/s experiences a constant acceleration of-4gbxvnq p5i8 89nmti $2.0 \; m/s^2$. 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 direction) w*/h/gi ,jt.vkjz txu /jkle; )ith a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm. What is;hjxe k u./ktv/i,*/zjl )tjg 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 cata4o aqnd*z a5gmu6)syf 5c7+pdpult on an aircraft carrier. It reaches a speed of 4fsmz5au7o d *dcnyp5+ qag)642 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration 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 rest movesf9x)4-8 hekekypz w3d 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 awn8q) k(t9pw pverage acceleratiot )nwk( qwp9p8n?

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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 and undergoes uniform acceleration. Durv2r 6tv7s ;pg nbxhhat*z-;sog )5 .bfqm i+x/ing the first second itg*shn.;)b-p tgxq bft/o r 2 v;6xmz7i+h5vas travels 5.0 m. 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 constant acceleration. In*p hki/3t+xaz tx:i8i itially it i/ttiki8+3h z xx pa*:is traveling at 16 m/s. Three seconds later it is traveling 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 a ht3f/d a+xo4lu2g9 bknd accelerates 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 on a dry road can decewx )t1yn-q4gulerate 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 8qk6lqw8,(pndf7lyx 7hf2ov5uni4e green, a car that has been waiting at the intersection7x 8(k 7weq6q,fy8 lp42od5iulnvfnh 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 s+xbqw ok)v7 (apeed of 12 m/s on the surface of planet X where the acceleration due to gravaw7 xk+()qvb oity 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 12 lt f,q6-pja )aws0as0)a2jrc m/s on the surface of planet X where the acceleration, l2)6j0 wqr-jfa0spcataa)s 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 6f4elf*3 5ozhx. j chrwith a speed of 15 m/s on the surface of planet X where the acceleration duefh.4c rz hexo*35j l6f 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 upward with a speed of 14 m/s on the surface 27. t iwr38f hzd ml,v5fcl6boof planet X where the acceleration due to gravity iswl3f .8ho i, bmdzlr5f62vc 7t $3.5 \; m/s^2$. 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 rul m*4 xj yc-k.2pn:crkwer between your fingers and releases it without w:*jwkcyx.-p m4rc2 n karning, 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 upwarw/o8 :ln a8vptkv7my p5f)s,jd at a velocity of 19.6 m/s. What is its velocity after 3.00pp o 58k l 7jn8t:f,asvw)/vmy s?

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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 in 10 s. What iap9jl 8rv; ;les the initial speedrelp9 lvj;a;8 of the bullet?

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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 w3lwg;,c (6ui8rj ( h ofgq/jnvith a speed of 36.0 m/s. How long does it take to return to its stgj lj,uo(ri 6 w;vf3h/qg8nc(arting 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 downward4.qj-8f ;8zjqx b3kvdqei7rd from the top of a building with an initial speed of 25 m;r748 q e3 -fidq jxdkzjb8q.v/s. It strikes the ground after 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 sp4 g,zewpte 2i7kd)5 + 3dvxgaseed of 30 m/s. (only fill in numerical value in thaz+ 7 , 2k tev5gxg3d4d)siwepe blanks)
(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 b*ax(zne+48zky8 3mgl l dj*nthe air with a speed of 30.0 m/s. (only fill in*ln k8z*ab3xzyg e 8l+nj(md4 numerical value in 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 velocity at t = 1.0 s?1v skju 7cm*:l


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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 the velocity at t = 2.5;(f flgbq.7y oc+( cqu 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 at t 8as 5roab,p5mvb41 y n= 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 7rwpwwvh(/ksz77443e gi z 4pj*x agi(ip2mdthe 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:f,lriek:u7s0 p wa9j 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 av ahfhzu. 7z/c,rq)3rcerage 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 accelerl71l mk4mig+ mjw e,iq+ t-jv6ation at 1.0 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 the acceyyrqok/y 8mjkpbt; dw,0: *;uleration 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 accell7+fek k5;tu: of6n maeration from 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 the average acceleration a1my h3gzf)6yq*kh ngr0/+ ne 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 the displaceme05 csvrwj lja o0.ee4+nt from 0 to 8.0 s?


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