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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 travels from o*dsmcf:z *1*vuvt p/ttma/. one point in space to another. Make a comparison between tot1zfta: **td/vvmps m.cu*/ he displacement 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 eqd .kjmjrq3( c(ual 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 zero to six1ze0s.0 r qy9*dzlpybty in 8 s". This is a ds09qbpzy0z d. l eyr*1escription 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 experiences an accelerapg. upes; a64ution 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 the0 i4s tet ebr)wgtx*eoc2*u(5 East (+x direction) begins to slow down as it appboit)uet(* 2te50 rgx wc*4seroaches 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 the West (-x direction) beginse6nfg f(8 fhi3 to slow down as it approaches a traffic light. Make a 3n8(fgi f hfe6statement 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 constant velocity. Make a statement cobcr3glqf. sf6l tt-w u.6a,n 6ncerning its accelerafa6wt- .tgf l,nbs3u q.r66cl 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 zera 7i uxakai;9pdg;c-jg)c 7u pfbzg ;oc43)k(o, does it mean that the acceleration is zero? Support your answercp (gakzi7-) 7c;u 4co i3gaapjxf;du9 bkg); 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 aa/9al s+6xk n9ga hp j/v4t+npq:h sx)cceleration is constant? Support your /t +jx v9as pn/hn+l69s)hqxg4 a:pakanswer 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 acceleratw8ete;pfe5 o1rf0dh 9ion. Make a statement concerning its motion witfee5d8o1f ;re t0w9hph 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 its acceleration baa.ih)j ,s a;z0n s4b*5s,rlz 8klkhis decreasing? Support yourazs 85ilka0zs hnj),. ;a,b4*kr bhls answer 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 along aj1.lwv5i, avi smooth hill of ice. Make a statement con.i j,i5l1 wvavcerning 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 velocitp;tjuh2)37( ta:epadpfo/k p y equal to the average of the object's initial and final velochd /pta(te3ap ;p j)ok 2:7fupity?

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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. Theyh 1cfh*b 6dydk*f qr05 both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is t1qy6hfhdfc k d0br*5*he 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 accelerate at e el6rq sbti1to;md.+x j-8u9the same rate. However, object A accelerates for twice the time as object B. What is the distanq sloi 8tee .+;xmr9b6-j u1tdce 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 releaseawiw,*t sd:aec/ 4z: ywu3+mnd from rest and falls in the absence of friction, which3wws ,+mntieyzc::wa /du4a * of 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 from rest and fvy2ekn 73a orj1l513i3kiulaw 0ww7 ealls in the absence of friction, which of the following ik70i3n7v w 3wa23yw5 r1alljei1kuoes 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 fqb*ti;f+ -70,b o:;sy3l8a/vc exl rreljkza statement about the velocity and the acceleration when the balleb q/k7; ofz; xfbjt,vr0+r l3ey8al*csi l:- 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 thoei*4 7qqruo nddqh:17(ue *erown straight up. What is its acceleration just before it reaches its highest pnqd*e77qui hoeu1e 4*o:(qdr oint?

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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 sr/muhsh* r7 s)w)cw (mtraight up, reaches a maximum height, then falls to its initirc(w wshs *u 7rm/mh))al height. 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 he)mr2c4mop19 b ww8(e7l e jkpmight, then falls to its initial height. Make a statement about the direction e4m )2p cwb klrp(oe978mw j1mof 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 air )1xuxsn6 y*xrresistance. Make a statement concerning its acceleratio1u )6rn sxx*yxn.

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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 acceleration jds+: p57ycfy1tm+qn when she sh: +t1f npc5smyy d7qj+e 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. An identical second bap ccbrq:q .8k/ll is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height ofqkrcp q8 c/.b: the second 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 of a building. One secon:p +yo klv7w6b l2nek7t)(rard later, ball B is dropped from the same building. As time progry)(o2l7aetn lw+ vpr rb:k6 k7esses, 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 buildint6ema)iq ,jbz9g+t 4n 1g+c uig. One second later, ball B is dropped from the same build)1 t9ga ,cbi4+neq+ 6jtzgm uiing. As time progresses, 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 frx ,ofp+k1-iss om the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are thspso,i1k- +fxeir 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 br*i+d0c2* mhnqzx szh 7ick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. i2 *h0z *h+smzdn 7xqcCompare 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 3nj i7(0i)a-sqx(fp r nca 6ooconstant non-zero velocity in the +x axis. The position versus time graph of this o)oqcn(r(aasf36n ii7p 0j- xobject 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 1n:fu 5bo,bq o5lo re1with constant non-zero acceleration in the +x axis. The posi: boerl o fub,1o51nq5tion 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 constan;t, sjmd,7lu,61ci 8nyit qtzt non-zero velocity in the +x axis. The velocity versus time graph o6 y m1z 87,j,iquci;tlt s,ntdf 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-zero acceleration i h0d-2;k evy;;epdz7k19mhatkg bkn+ n the +x axis. The velocity ve -te0he hv;dky7 d;+z1bkn2 ;gm pkka9rsus 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 ,bur+2pqw zp ayf:4f3graph 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 0e 33sn3la adzb6tvnrv: p0,rgraph 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 acceleration vers0vg; vkp uiy u4m62d6kus 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 curnkxz/c (mq*6v +q)havve in a velocity 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 line, the oby /s yjw,.wn ()lgmbq2ject in)y/b.j (q2gwymwl, s s

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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 ji;xhzhyf g7lg at8/vh:v l6 0c9:ig- time graph of an object is a vertical line, the object is6: igv:t ;-/ fchvzal89gj0i7xl yhgh

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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 lig.7jsl g;uno2ne, the object iogl2 ;j.7nusg s

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity versusf-teb4)/dpf ra; mol 9+ z)oio time graph of an object is a straight line making an angle of 30 degrees with the time axis, the o )ti/d) e9f oozbo;-r m4al+fpbject 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 t5vmjsrmfp 9q0j ;d 7 .fjsct)g,i q,j9hen 11.0 m south. Find both the distance trave.;mg99t jis m,p 5jj7 s fcqf)rvq,jd0led 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 ; ,h/jcp*nh nfwater. How long will it take to move 12 km upstream in ncnf; ,h *pjh/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 = 160mc n9766:(tbuw m 1gfb .rhozi9 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 order to r i10wrd+gbj :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 m9*;,paeghlarg- w xx. in. What is the average speedxh. l,a9xg;apew- r*g of the runner 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 takej)kln ;f 0/* ise fc*wk:xi8fe for it to travel 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 travels 1 5uo+u k/ b zmd*w,rijr,zq7hin one year. The speed of light is 3.00 x 108 m/s. How many miles are to+ ,7j ,biduw1q5zz*/rkm hruhere 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 the sido,e3 y3xz1k9d ; xcadpc 9o(ide for 4.0 s, how far do you travel during this inad1doxc i3 9e aoy z(cpk,d3;x9ttentive 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), inwty 189u(w g iry+7ftu 100 s, your average velocity isyt7 f tuw8w9 uyrg1(i+

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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 Pkfko53m g q4 800vlgelole. 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. Thikl5kvl o0fm eg g34q80s 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 ;g/xr7a0y ;o*rm8ehle-1webo6 j al r North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km weshgbar-xr0/e;o7 om 6er8;l l1jwy *ae t 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 vefr) n q46 /g4w9rafza weekend 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/ea4z6rfg9f w )r qvn4 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. What is the ao2,dxl0 ez u m j7o)(w3iahts+verage sxhlzmu ta7 )jo2 i(es d,+ow30peed 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 807u9,9w(9 hgxrq k g-pkwoco7 t km/h and 2.0 h at 100 km/h. What is her average speed for the trigug9kw -p9 o9 q7ork,x7(htcwp?

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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 an s56s.xw71 agtobul0c d then at 250 mi/h north for 750 miles. What is the average speed for the trip?s6t awgu cs7l5o01 x.b

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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 pepu2d ssr9k q(3rson who 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 10.12pus d9q3rks( 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's average ja2t .nt 2a b3+dabv x7138izofq7anevelocity during deceleration was 50 km/h. What was38+tbaatvd1b7e7axqn.ojzn2 i fa32 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 speedlanws a2 x-dzg17es p4e a*- hrr-5l)d from 100 m/s to 160 m/s, at the average rate of x)aln2a rz a-d4*1s -7gp-e slhewr5d$15 \; m/s^2$. 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 accele7ejv:0w 6 mj*bf bsu25az -eerrates 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 a2qs3 kyus5- e ycf*zch44b)stk4 i jk6ccelerates 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 with a constaeum m,a9v2 7z-yo8idyp h( hu4nt acceleration ofy2eum4u mizp -hd9va(oh y87, $2.0 \; m/s^2$ 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 expeve o1ol.o1gz z3qy 1m;e bt3-priences a constant acceleration ozo3o-ql13g.eev z1m;y pb1 otf $2.0 \; m/s^2$. 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 (ll):sb:3)t r1dzngof +x direction) with a speed of 500 m/s strikes a sa:1b tonf rs)d:l lg3z)ndbag and penetrates 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 lau8ik7w;:ps f+azd+bdh nched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this reqshdai f b:8;wzkd+ p+7uires 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 moves with cor-d x* d gp;2ep*asgb9voap48 nstant 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 tof ,n, 2dhenm )9/sod;y pef(oq 9vb6hn 80 m/s in a distance of 200 m. What is its average acce6b;yf oo,(/ )hd 2 dn9m qevf,pshnn9eleration?

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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 qrbtg 62cfr5+qwgt94qc ;3p nand undergoes uniform acceleration. During the first second it travels 5.0 m. 6 ; gp 9nqr+qtcf542tb3qgwcr 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 stf2v- rgst(5/j)f ro+v4xvyhiraight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling atry(v isr+v -x4 25/vg) ffthoj 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 accelerates unfe)gu-g+ga,/ hyn11rr mz1 nliformly 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)57mqktt nk9uk0)aoa 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 lu 0/anumjm fp3-qi x*9e;x(d pight turns green, a car that has been waiting at the intersection starts ahead with a constant acceleration of ; m3p9ep/aqnfx*i-m0 uj(xdu $2.00 \; m/s^2$. 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 spe,bptjsu 75vs3 y k//njed of 12 m/s on the surface of planet X whereysn 7kp5, vjb/u/ tj3s 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 uprdpn8dz( .7op ward with a speed of 12 m/s on the surface of planet X where opz r8pn7 .d(dthe 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 upw( diok 2,zgxmfunn4 t8 w50gv1ard with a speed of 15 m/s on the surface of planet X where the acceleration due to 0noxku nv fg24mdg(zw,i5 8t1gravity 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 of planet *p*a,pntp 1t7 jc-waumxk4c 5 X where the acceleration due to gravity tpxp*kc7j ma n1utw -54*c,apis $3.5 \; m/s^2$. 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 fri3n qiu8 0y-+a8uqew mmend holds a ruler between your fingers and releases it without warning, how far ueqmm wu yi0naq38-8+ 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 at a velocity of 19.6 m/s. What is its velocity after ba6rvn64xn l2evsbh 7u:;gz : dfsh*/3.;e7:hdsf4xrh6gs vbv*b 2 u z6na:n /l00 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 is the 29srb; 5z ci73 t+zkh8gwholces; y:yinitia: y ech95s+tz2 ;i;8bzwog hksyc73rl l speed 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 with a speed of 36.0 m/s. How la4jd m, lc/(avong does it take to return to its starting po ,c4daa(l/ mvjint?

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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 downwawvk. jlnlf9 u*/kzw0u8 p 7g+qrd from the top of a building with an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high is the building?zq7f*guuk +l0pw k j/wvn8. 9l

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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/9*u2o2ncy2 whq n c:uqs. (only fill in numerical value in the blanky9chqw *oc2 un2u 2nq:s)
(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 )v9v:y ch4lnt 2gdr i)kj,c 7fair with a speed of 30.0 m/s. (only fill in numerical valnkg:) tcd,v9iyh7lcf)4j rv 2ue 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 = 1y-drvphsx:dhzb .0cr9j ;/ 8vj 0 xjd6.0 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.* k :8k6 ixkg4uorj6ay5 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 = 4.0 s?/ k -8p.jmotyvb11 qvq


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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 gn7l/ vc 3dw+nhp/5ei the 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 f(ox uqe*,hds m6 r-vb,rom 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 th2.jm bdwd5q8src3(5l dw:i,itc 9 y0lc unn;he average 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 ecw .: 1y9lpjzj-s y(ks?


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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 accelerato hb,;fv; b ez;.-cickion 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 0 tqiq4ppg0 ki29,gyb -wo 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 acceleratio* (tlfn d3ij.qg+ wzj,n 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 :6 zxip9 wjc1hdisplacement from 0 to 8.0 s?


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