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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: 匿名未登录  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 travelsj/3: ydx0td c gv:cx2a from one point in space to another. Make a comparison between the displacement anddcx va 2yc3:dtjx/:g0 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 ininenddy4l/:, :7rk4h s2yvi5sbvytm nd+ h54stantaneous 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 zero to sixty in 8id5sc i.-h)+kq jvaw6 s". This d.w hj i )v+a-qsk65icis a 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 the +x axis expzgsp*isbk-(, ,4 e kugeriences 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 direction) begip,cqz+pv j kqv:(mz:(0i4g 3gu8h.h5h mwnp ons to slow down as it approp(hv 8 .:qhmquc hpgi v:,n(wzp+45gkjzo0 3maches 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 travelinz8 t(+-;wm4l plifl*eax8knn g to the West (-x direction) begins to slow down as it approaches a traffic lig;4n w(z *+teplxnlkla f88-im ht. 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 is moving with a-vxlzn6zgyx e4( kn8j u4c a1 e25hu2c./zyad constant velocity. Make a statement concerning its acceleration.u cn4y2zzeyag5la2c81xn /(j z.4xhdk6v -u e

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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 s c+a jd8jxp0(bx,in3p4g6c w it mean that the acceleration is zero? Supc06,8nx3pi j dgc(awbx jps+4port 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.5aaaxpki 4d( direction when its acceleration is constant? Support yourak5a4a( ipxd. 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 objec6qr4s5 )0 himj ,bdr/ 7gmokuyt is moving with constant acceleration. Make a statement concerning its motion with respect to 4r, )/j5oui6d kg07s bmy hrmqtime.

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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 i-+ 3rk lywmmh1r -pgf3ncreasing speed while its acceleration is decreasing? Support your answer wif- grh-wpmkmr yl3+ 13th 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 up8udxw o )o1txo,+pjl4 along a smooth hill of ice. Make a stateoto4d,81 xwx)l p u+ojment 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 h6/ ozl aakdzg.l ,n08:v rtx6/qzwp4is average velocity equal to the average of the object's initial apxz6zqv4zwra ll 6g:8ko,. t /d hn0/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 restg8 jo 1 o6q04i4llksuk. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speedoq60k 8lks4glo4uji 1 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 bothf/ud, xt/w5 yj accelerate at the same rate. However, object A accelerates for twice the t5,xy f/j/ tdwuime 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 from rest h .fdbjz aa,a3),1qksand falls in the absence of friction, which of the following is truebfha a1)3k.jq,s d, az 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 in4f;oy7mxid3mfuz d v (7f98ad the absence of friction, which of the following is true conce 8yi(94 vf dmd;dm3xfo fzau77rning 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 statemenc9,c,hyr s(u *cqjsh-t about the velocity and the accelerac,*urj(y hscq cs 9-,htion when the 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 straighfkhgic5sap ;fx )y1u6 n-/rk7t up. What is its acceleration just before it reaches its highestis 5p ca; 7f)61rf- kh/uykxng 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, :g;7mbjghx/t then falls to its initial height. Maket mjh;b:7g /xg 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, then falls to itj 6tlnmq6(: vts initial height. Make a statement about the direction of the velocv6 tlq(6jm:nt ity 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 air resistance. Make a statet)4:/ fcwxz wp92hd1 md51qo(c b rzv:v ph3anment concerning its a4vd2 pvnmw9qca:3dht 5xo:( rzphzf cw/)11 bcceleration.

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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 acceleral mf6mhyjj ;4- hc/ss3tsaz/zy 9r63etion when she she reaches zl9h c/f; tz s3m4y sahj3rej-m/6ys6terminal 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. An identica v.v qsf.2ck4xl 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 balxv.4s 2f vkq.cl?)

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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 later, ball B is dropnp;516 w zvairo0z6fsf0i wa81yr. qvped from the same building. v 1;rzfioz86si 0 fq1r0vp wnw5ya6a. As time progresses, 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 buildink5z0nl krwy4ptd r/3; g. One second later, ball B is dropped from the same building. As time progresser n5zw/rkl3kd;04ytp s, the difference 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. O 5-*j yz rvmp4lpslj,ety(*ovm4 so3 ,ne is thrown up, and the other is thrown down, both with the sm,l4 mvrp4 oz, j*3 tse*(yv5 o-lsjpyame 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 a building. A second brick is thrown 1s:2 ,-i 6kybdn hxtbvstraight down from the same building. They are released at the same time. Neglect air resistance. Compare the-6ki 2:nbdh ,1xytv sb 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 constad*3np huod1h/cew*z p3 (v3m t;ek8 rpnt non-zero velocity in the +x axis. The position versm3ehp /u 8 (1**pekn33 hodt; rpdcwzvus time graph 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 non-zero acceler/zvi)* o/a.t5y (, mmwmfqx+ c4zxqz oation in the +x axis. The position versus timzfm a,/qxxoct *o(z .z/mw)y+ vqi 4m5e 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 non-zero velocity dq n:9ded4s7qin the +x axis. The velocity versus time graph of this obj:d9 dqnd4qe7 sect 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 wic gecb.jb j1q* 4xf35bth constant non-zero acceleration in the +x axis. The velocity ve5jbb 1*gqfcx 4jb3.ecrsus 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 versu :vdss :r3z/zus time 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 versus time graph givcoj(nu,eo 23nes

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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 accel nae 571sy sw32kbj0/t1ghxfieration 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 gra*-qnfqd (u8zlv+g4c mph 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 l c zou:*f3sga 3x43g2njeeaq 3ine, the object x3eg4qs 3u ef3nj g2ca*a :z3ois

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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, trfxbaabalv)4,l66rvt; t*m. )n q u9nhe object islv6tunfqvlbxa; 4m.nr6,b9 )ta ) *ra

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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, themqr 5off7io5lp8d h xs6c*i ); object isi;x5 7icfdhf58)o*rlpsm o6 q

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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 object is a straight line m *p3k8;st8ybh b6 w1g dla)airaking an angle of 30 degrees with ths8blg*;16krib3t 8pd ahy w )ae 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 11.0 m south. Find both the distancejhh/iis,4ik;x;in or 3ai *h, traveled and the magnitude of the displacem*xj, 4r3 ak;hhsniii;,/ii hoent 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 will it take to move 1pt.q q ,w q;6vc,pww1g2 km upstream in a rivp cq1 , t6wpw,g;wqq.ver 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? (txv2y 2v*3blc 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 average speed in omm27/x1l k atay :12gbmblf p0rder 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 (approxi d,6 lw qy8 b2bqjy9utfrm 6t6u082cdnmately 42.0 km) in 2 hours and 57 min. What is the average speed of the ru qrcu0qy2wb6 2y6 f6988, djumbtd ntlnner 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 travel 400 ks( u+1 dznwo0zm?

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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 qt;wo k.qbd+ rvf3+- dkw(z c ,e5ogy)travels in one year. The speed of light is 3.00 x 108 m/s. y)tddk+w+5qz qo;vrw e- b(.g 3,kcfo How many 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 and you loo:o h i0vwh +j:rw/wx1hk to the side for 4. :1wwhi hr +/w:o0xvhj0 s, how far do you travel 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 100 s, your a) c,ok)fzm9mucv9q pm 0om0k9verage m uk990) zmc0)ckfqmov9 op,m 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. It travels 1.0 km south, then 1.0 k.o+aqvsc2 tst2(fd 9mska8*3p b+ophm east, then 1.0 km north, then 1.0 km west to return toc s2+ds.s +ott*m aah(2k39op vbpf q8 its starting point. 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 1qg lgk)*ug/7 y.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 45 min. What was the q7kg /y)l*gug 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 weekend from school at 55 mi/hgw(pk *dnq*m:b. ow ph,e;h5 g for 110 miles. It then starts t(b g,;p.m*h5: nkp qwo hdwe*go snow and you slow to 35 mi/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 km/h. Wxhte; 8vcv 06mhat is the average spee60cm8 htxv;evd 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+nwff.g 8t7jp km/h and 2.0 h at 100 km/h. What is her average speed fofp8+t.7wf j ngr 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 north lpw m2(ju ,e v7/,8h kjcqyd/oo:kba+ for 750 miles. What is t ujwp2 kva8(km/c/7 b,eyl h:od+q,johe average 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 (the person w0 l8;k 0vnn wq h-oe.mwz1sw-oho runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m in 10.qo1z wk-vs80e;-onw w .lnm0h1 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 afterib-gw kr7pl hw .1,ftp*z*kc . 10 s. The car's average velocity during deceleration was 50 km/h. What was the car's deceleration while slobg, .i. 7lfw-hr ppk w*1czt*kwing 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 ou,yb 6f-2nfn kf fy -knuf62b n,$15 \; m/s^2$. 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 accelerateg9j*up+5ena 3sefj 5ctk5tt4s 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 rest and accele712 8 ejmd.no 1jl wl saxt,nwb-,i*cwrates 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 qf(ye) ;qw)lg.hz4 yzm:3vt s up with a constant acceleration ofqzh:lz(m 43);stwf) vqg. yey $2.0 \; m/s^2$ 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 acceleajs(s87gbb k i 3s5y/jration ofsb3 s kig7a(jsb5j /8y $2.0 \; m/s^2$. 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 (+4sdd8 om 5z1bcx direction) with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm. What is the average acceleration, cs5od 8m4d b1zin $m/s^2$, 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 cadfy te g /;/ v/ramnj127vswi+tapult 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 acce/tf;j7gyv+niw mer/ v1d a/s2leration 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 moves with constant acck.9/ 5nl dq.oxkxi- ,8jwlm roeleration 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 to1 pwn/ pgp5f+ l,kozf5 80 m/s in a distance of 200 m. What is its average acceleratio,/pf+ 5g5 nwzpf1lpko n?

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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. During the f*suwl9d -93tx dqij+0u gem om5 j4h(qirst second it travels 5.0 m. How far will it travel du9g hj-+m0w(lqi34 xs*de 5 9jumdtqouring 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 straigah3r6 t)e4o kiol1x; q mq,*dbht line with constant acceleration. Initially it is traveling at 16 m/s. Tho ihq 1dk re3*lq;taom)b 64,xree 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 and acce(+ d6j j3x lygt-kf5thlerates 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 8lxxed cus283 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 trafyi* 2h4aang9h ,guor3fic light turns green, a car that has been waiting at the intersectrggin94y a3a h*u,ho2ion 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 of plan6zxw.p2 .2leq9dcw hn u3 xhv:et X whehde2wnc.u 6v zxqwpx9 l2 .3h:re the acceleration 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 12 m/s vf1plgav t( 0(ei)pl r8b*(pxl4wb:q on the surface of planet X where the acceleration(al)ltl(vpvgiw0f p*b (41 br8xep :q 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/y0wdty is2rspu5z 28b3jc 7 1ws on the surface of planet X where the acceleration d sp3uzyy120jr27 d w85istbc wue 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/dzr3w +n d;x 4)cha:frs on the surface of planet X where the acceleration due to grax:fr3ha zd dw4n); +rcvity 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. Isg/lkw ;n:d0.wtk7jq f your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fa/;kktljn .:wdgws q70ll 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 at a velocity of 19.6 m/s. Whay02 ( /v0esykwcgcz 3kt is its velocity after 3.00c/ge w(kz0y2ck0v sy3 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 16fh jvka05v-vp4pv e1tw+g2f bo7x/ m0 s. What is the initial speed of the bj7vpxagf2-1hb5tv+v 4kove/p 0 6fmwullet?

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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 3;gx1 yj,w6;j zrne.nt6.0 m/s. How long does it take to return to its startiw j 6yg; ;nrxt1jzn.,eng 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 o h qxpswh/ 236vxsnm78f a building with an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high is the bui vnmpqh7sh3s6/8x wx2 lding?

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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 n8zo rg6db2j3bumerical value in bbz3r6jd 2o8gthe 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 the air with a speed of 30.0 m/s. (only :seu bz9fj8( f(-fgj gfill in numerical value in tebjg(-8j (:g fusf9zfhe 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 y iv ol8nx:d ) 27-,gkbgwc-zdvelocity 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 the velocity at t = 2.f1 h1l4ohdbq )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 a;v(glx4f.k j;i3n yle)v3 vw mt 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 vmzahq*a5 1.ld9i i6nrnsy(,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 xm)no7g u38imfo a5r5 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 averag da cg,t29r/ qqxds*3/;q yhnge 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 aclllek/3q6oxh8c5u4f/ l bb f z+*rrsb7 9kt4zceleration 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 the6c8b9fsbomz6qp ddxb3bc1: 2 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 tn -3wm4m xo4nsv n;e/ahe average acceleration 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 from 0 to 8.0 sxkr++/zl cmq 3?


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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 di 0pr bm)ijf/dm- fqz+9splacement from 0 to 8.0 s?


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