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习题练习:Physics Unit2: Kinematics One Dimensional Motion



 作者: admin   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 one point in space to another. Make a pjbcer -;*5jwb4 znz31j3wllcomparison between the displacement and the distance traveled.*b1j5lp z ; zw3cb3rj le4j-nw

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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 objectp.;( sq4y ikkuazb0l, equal 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 ta(s . g+k(4yej ren1vlheir car can go "from zero to sixty in 8 s". Thi ( .yg4jesr k1n(elv+as is 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 td + rglovx2a+pf)(3y0o-uimrhe +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 Easti166vm s+ oqwm+ui10a. a:d /zdvybkp (+x direction) begins to slow down as it approaches a traffic light. Make a statement conciv./aa vd+i+w s: mb166ud1yp0ozk qmerning 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) begins to slolazbf:b: ,x ,7q8nrf ew down as it appro7rf bbfq8 , zn::xela,aches a traffic light. 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 constant velocity. Make eg +*fh5/nb6z(pngyy a statement concerni pnfh5gn+/6eb*y z(gy ng its acceleration.

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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 obj.82/e )ts p6b2cazc p8dfqeg nect is zero, does it mean that the acceleration is zero? Support your answer with f2eb8cg p qesazn) 8tp6.d/ 2can 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 iswq 0/ 3;blce (awu(yva constant? Support your answer with an;wl(ycv0(e3ub /aqwa 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 acceleration. Make a st klm jzya--4 6m too7ex.4chd2atement concerning its motion with respect to ti 46oml-xh jado7z42.kymte- cme.

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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 w 7hdv7 -;p cmyg4pdvf3hile its acceleration is decreasing? Support yod7- f7 ;vy3p4 pvgdmhcur 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 initiaz-9+zzoz 7 zsnl kick, moves up along a smooth hill of ice. Make a statement concerning its a z- z+zn79szozcceleration.

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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's h6:rqtp2jm8)iua q 8l initial and fi8rj8 qhpu i6lqt2m) :anal 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 acce40ncoe2 nz(xf-kj 1 nulerate 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 that of (u2kjnf-o1enx zn c40object 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 tewux*d:s9 i.zhe same rate. However, object A accelerates for twice the z*:ux si 9wed.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 released from rest andl;k7oio:lx 46fbpd m :qh 4j(o falls in the absence of friction, which of the fokijlpm4d;qf6 ohb7x:: 4lo( ollowing is true concerning its motion?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When an object is released from rest and falls in te-(*; )wtdtk : 8dudmouygll1a* d e)khe absence of friction, which of the following is true concerning it e ot8myl-*)u(t1dkd:*duedklg)w ;a s 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 sta2o; pow.yhc(ntement about the velocity and the acceleration when the ball reaches topo;( .nh2w cyhe 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 thrown3 i,lku5 d(oghjh s92a straight up. What is its acceleration just before it reaches its highest poi9s,j 2(ok5 l3u hdagihnt?

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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 5pksh e2-kxf;7et,ly m8 ai3c up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and accepy -hkta3ci 5 8 mee2l,kx;7fsleration 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 heigpi -8ll2 w:ycwht, then falls to its initial height. Make a statement about the direwc wp2l: il8y-ction of the velocity and acceleration as the ball is coming down.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown downward e4v /.xd zhfx,in the absence of air resistance. Make a statement conc d/vexx4zf.h, erning 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 jumt.lp.wi hy89t ps from a high-flying plane. What is her acceleration when wh9 i.ty lp8t.she she reaches terminal velocity?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown vertically upward wi.-rvefhjxb2 b3go7r .th 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 gfb72o. ej3 x.rbvhr-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. O *+*v1 bdoyn,l 8pjeeldyr ,1une second later, ball B is dropped from the same bu l* on1p1ely,d ,ej+8vd* bruyilding. 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 building. One second later, ball B is drvwrw:e3eu/)64 7lumoo er 16fn :sexfopped from 4/ r7mfu:1:3 f6eww uoerxonlsev )e6 the same building. 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 from the top of na/ d a,oy pp(4jhs7q 1q;z(cba tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are(4, p;sbqh (o7yq npdz/c jaa1 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 buildik(6+qhn:xbj,hl1ble i . -r+ y0zwou kng. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of6+lx okwh1bkj,r(eqlin z -h.+ub0:y 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 constnv sw:, yrts9m -lkuc o*/.xl2ant non-zero velocity in the +x axis. The position versus time grav, /:n2us9c ok*rylts.l xm w-ph 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 c//lfpe g :n te;hf51aionstant non-zero acceleration in the +x axis. The position versus time graph of thisifte :l 5hg/;p1efn/a 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-u o5rvt1m 0-hy ay6xiz y*8o+ezero velocity in the +x axis. The velocity versus time mho- t i1r *azxey6o08y+u5vygraph 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 co(. (j,d3he,rdl jwomt6h c cu+nstant non-zero acceleration in the +x axis. The velocity versus t+e j(h,,.d(3uj6dc mhlc tworime 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 positwnzzui/9//q3 pb9gmb ion versus 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 vthwwls57dne+65a )c 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 acq1v- z)sb 7fbmceleration 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 timeu:dwywy2z*qo ufp. + : 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 z-8(i 1lh)byr, lzkms of an object is a horizontal line, the object r, hb)zm l(kzs 8ly1-iis

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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 c+curvk 5safs-3.9jw object is a vertical line, the object is. vcs-59fwk c3+sar ju

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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 lwy9 9j(b+ 1l*b whfy :i*cwukcine, the object (lw: wchi uw+9b1f c9**yjykbis

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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 makjhy9*(vw;yzi f7np+r ing an angle of 30 degrees with the time axis, r wnp9yf+;izy(h 7v*jthe 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 4lpez/+dior2 distance traveled and the ma4i+zle2/ ordpgnitude 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 waters1moys; h n191+gnne6b) zkc1e1 fyts. How long will it take to move 12 km upstream in a river flowing 6.0 km/h?g+k fz1 ochy e; t61s19esyb)nm 1n1ns

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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 cau:uie w;a4s2 jd8rx 8h61tymi = 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 speiqaozzge g273z u3;8tdi,za- ed 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 (approtn320 c kj3cdi:o6n esximately 42.0 km) in 2 hours and 57 min. What is the averagec 6keo jtcn:2nd3si03 speed 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 take for it2qc egi4+ ucd( 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 in one year. The speetz+u36:4oiv.4qog lmqfqf 4ed of light is 3.00 x 108 m/s. How many miles are mfgeulf 6iq:4vtz+o oq 34 4q.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 stjdod;d ,ig hbr5;x50xraight road and you look to the side for 4.0 s, how far do you travel during this inattentive pxod ;dixr; 5hdjgb,5 0eriod?

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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),w2 eb (oloj */g4gh8v:hyfi*sv ot ;.z in 100 s, your average ve:2hi 8flogyw (h*vzootj;bseg *4/v.locity 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 j6 yp.-g de5gh 7pml0mtravels 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 45 min. What was the bear's average sp6l-gmhypmed0 g5 p.j7 eed?

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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 Nkw6))mrsoxo(g,.jmo 7 t w. guorth Pole. 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 45 ming. t)m6)j 7.woosm,(gk uwx or. What was the bear's average velocity?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are driving home on a weekend fro;: b(na;dfj+tpzu361 fch (0sythxe ym school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your t:;tey; afdx(6fy(p 0h ubn hjc13 sz+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+ 2pyfe.x3d pirakqd63 6 l7ul 160 km at 100 km/h. What is the average spee3xd+3 uea2lrid7 p6p.fyk q6l d 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 i xzzzfk,efq005h t0h3p 1a u-2.0 h at 100 km/h. What is her average sp qzfkixa,z e 5h3hpzu 1-0t0f0eed 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 then at 250 mid6guo. r(5 z.l3 o y2*zpbin 7sw,xemo/h north for 7rpuy3im obe67 s.*5dw.zlo gx 2(n,oz50 miles. What is the 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 zf+ag 34tgl rq0:/teodi2 -f xwho runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman f4lz20 t-oeq+/:trxi fgfdag3 or 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's averagduyym:lys 8n+7 m/nd(ha+ nv7 e velocity during deceleration was 50 km/h. What was the car's de+m8dy77+: unna l/nydms(yvhceleration 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 sp:0bv 0 e bwcxbwp2u)2jeed from 100 m/s to 160 m/s, at the average rate of 0 cb0xbwv:u )2 pwbe2j$15 \; m/s^2$. 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 accre g8xam0s eu9a4d a1yc.3m;h elerates 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 accelerateoloznv*0b (7 zs 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 constant acceleralbpy xc5 ,x9ts. u(8jation (lcx5y.b,tas9 x puj8 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 experie:f,u rbz,e(g jnces a constant acceleration ogbfr,:(e z,u jf $2.0 \; m/s^2$. 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 direcs:qcj z*l95m.t.xo7eft -qux tion) with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm.m clo95*j7ste: .qfztqx.-ux What is the average acceleration, in $m/s^2$, of the bullet?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A jet fighter plane is launched from9 zqavgz 48:jn 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 the catapu jva9n:8g zzq4lt?

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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 j/ *3dic3jbc lwg84z1d8zfcwconstant 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 bavtm)w+s,d7d qe1qmsw6 ,9 o m/s in a distance of 200 m. What is its average acceleratiow +t,61 smvoqqdswe,9d7ba m)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 aq: c/,n/ii:r de x(pcbcceleration. During the first second it travels 5.0 m. repin id(:/ :cb/cq,xHow 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 accenp19) x.iy 5huy(bg cnleration. Initially it is traveling at 16 m/s. Three seconds later it is t.yc5) nn 1bu ih9gx(pyraveling 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 andxkce v n6r5-gi7 s4chddc.7/w e*oiq ; 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 onic(-w6t5j3o sy**lcs x01g +mwu d aoy 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 has been waiting :1wulh0bac: h a,kj-oat the intersection starts b o0- ,1a:auw:jckhlhahead 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 wi/yv gd*z1.)y zxk(x vv :lnjw4th a speed of 12 m/s on the surface of planet X where the ac*vy)v(g /xvxyz.dwk4 z1n:j lceleration 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 on the surface of plane .ksui;gqbhbt,9 : k)0w4z )6yhqsx ckt X where the acceleration 9)uk cykz)k6.gs;,: h s04ib thxwbqqdue 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 upo7frc. b/4(g3p x .n(vd e0npv9pdigjward with a speed of 15 m/s on the surface of planet X where the accelerati9pov3dc4rd./( gi bfgp7p.(nnv xe 0jon due to gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a6i lnbl2bntcv, xs 77/ rb.i8y speed of 14 m/s on the surface of planet X where the acc ll6bc/i2sbt 7n v nixbr.,78yeleration 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 ./ ikof oj,ixroy:sxz3*sl0 9 greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you c: j3kiozf,* islo.0y sor9xx/atch 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 9d;04uwsqkj v m/s. What is its velocity after 3wq49 0d uksjv;.00 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:w*gc9wb9hs2-nt mffh - .oygb-+ja s up returns to its starting point in 10 s. What is the initial speed of the bullet?w2-a:+. bo -*bhw-yffmg9c9gh jssnt

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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 o bccu(ue5pysvp+s8. u wjs+ 86f 36.0 m/s. How long does it take to return to its starting uve w.suc+up8 s6pb5+y sc(8jpoint?

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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 with an initb;y(wo plbbn: ;(eu1oial speed of 25 m/s. It strikes the ground after 2.0 s.;nu ( o; bl:ewb1(oybp How high is the building?

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81#
 
填空题 ( 3.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up with a speed of 30 m/s. (only fill in numerical va/,: a38l rb hi)wvmmxylue in the blan)b8mvx 3,ay/hirlwm : ks)
(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 th ut/ c laul(r3c7m)rh/e air with a speed of 30.0 m/s. (only fill in numerical value in thlulum//ca()rh c73 tre 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 ; ),dzl9dm1f+0ibvbn /icb o3p su)nwat 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 veloci,/ nvs+ pm31yirfsc 0bty 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 at j;5;t gawlz2zx 0am0.a8(fatb4at pm 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 velocf/b3jbc0jh* aity 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 s7k+r* v/i- 2v4p*y mcusdoea0 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.kozyw b02 2g,wj1m80m hwg lu;ug m3y 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 accelerau -/,x ; ,ulczsfu:glntion 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 acceleration at 3.llkhc :e 8+*7ouiily/ 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 to 5.0 s0yrhon )r27d z gtf2m4u7k hq.?


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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 avera+ -qfi6ttz , zji+bx2fge acceleration from 0 to 8.0 s?


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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the displacement from 0 to 8.0 s 0s ** xus-y(xc1pqxqs?


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