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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 one point in space to another. dbud)a (e*)w*qptmk/ Make a comparispdtbwe a(k*/))u*qd mon between the 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 equal to the instanta) 4w lz8 *-wmaq4kgo3lw7f junneous 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 inyg2uf , /m3cdg2t- yhs 8 s".td2 h3ygy2 uf-cg sm/, This 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 the +x axis experiences an acceyn0; m+m7dxy,mfh 5h1 ota7n zleration 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) begins to slow down a i- *-ookljsr7s it approaches a trafficj -sol-r7ik* o 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 then(0 gbtxpx2))6s n w pk9a0ygi West (-x direction) begins to slow down as it approaches a traffic light. Make a statement conb9w pgk0))y x nsx 2(60aingtpcerning 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 woon;hyg; di*pikd 2v*p; ic (,y a:r8constant velocity. Make a statement concerning it p,d;ivro2(c;h iygp 8:kw ;dy*on*ais 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 object is zer )y56fz5b y7 q )ebydwr,j6qeeo, does it mean that the acceleration is zero? Support ze6f567yb j q,rbeywe5q)) ydyour 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 directi2+p3 p-lx qrmvon when its acceleration is constant? Support your answer with an example+ vr-qxp3l2 mp.

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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 acceler7.wz la :gfk2aation. Make a statement concerning its motion agla fw.k72: zwith 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 is decreasi gxuj;9vot4:l 1w x:zgiqhs( )ng? Support your answer with an exam:vxq4g);(xtj: o ulgsz 9 w1ihple.

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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 1hb9 jb , 4k9e1qjt4pnn;fgmbof ice. Make a stab 4g4ep n 9,qb;9t1 jkf1jmhnbtement 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 objecn y 6r7w5ntekhh0zboxj 7m42 :0dt(w lt's initial an0e6jd0owzt hxb4 ntr2n 7m hk7l(y5:wd 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-y:*em ;./pi ucr.gbznv*g w/h fs3yq accelerate at the same rate. However, object A accelerates for twice the time as object B. W-iqr3z* .*. bs/chu ;nvgy f:ymewpg/hat 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. They both acceleratp+ 5o ;1j6c q(/r9wc )docb2dizf nrzwc r8k,je at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared tow d+rjzb1cw(8i,q6 kcd;2n zjrc rf po59c o/) 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 f9)t,(x +mbegeoz2h osrom rest and falls in the absence of friction, which ooe, m2estgz b9()ohx+f 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 restd kdv5q;7cu) u and falls in the absence of friction, which of the following is true concerning itsduv;uk)7 dq 5c 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 thgsjp l hifah((w:3(9 vrown straight up. Make a statement about the velocity and the acceleration when the ball reaches the highest poin(hl ag ((j hvsw:pi3f9t.

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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 str y5))dc n.9mfxbfg,8u0jd xmx aight up. What is its acceleration just before it reaches its high 8.ufb)dcy )nxd05xxf,jm9 g mest 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 stl8mid1y z wo)- 0s 8keclkgx66raight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball i6lm 8)id8ol0z6 y c 1ksx-ewgks 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, reach)hmo g(gc ndz-q c +6.ot--glues a maximum height, then falls to its initia-(olg)mn g-tc z.ud6 +qg-chol height. Make a statement about the direction 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 in the absence of air resistance. Make a gkyre1 *3ih+tg*+,gu qxy2v jstate *x 2,ug 3yre iqh*gv+j+g1ytkment concerning its acceleration.

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a skydiver jumps ,8tbqt x kk,1+vcajrgj) l )7ifrom a high-flying plane. What is her acceleration when she she c 7ia8r ),q+x)v t1klkj bjt,greaches 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 az m9psu:/*aaa ds 5s2with a speed v. An identical second ball is th*s2as/d :smpaua59 azrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

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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 a* kaybu7qx /;building. One second later, ball B is dropped from ak/x q;7ayu b*the same building. 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 secm p k9lc0c.tq,ond later, ball B is dropped from the same building. As timeqp.c mc,tl9k0 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 a tall buibh2gj/cf sy0e:a m- u)lding. One is thrown up, and thes/: -0ea2hguf)jcym b other is thrown down, both with the same 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 stp4 d+71tgba)fz cn nt:raight down from the same building. They are released at the same time. Neglect air resistance. Comparegd)fabt1n p :4c+t7zn 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 d3k9qd 39*ov)x,lhxky) aiy)0x ofq qnon-zero velocity in the +x axis. The position versus time q d*i9vq)qx,9kx))dfa ly3oy k 3ho0xgraph 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 c7p- (2qvknhwu onstant non-zero acceleration in the +x axis. The posi2u-nq7 (wkp vhtion 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 non6al p308m*asoci*:m z be3e rj-zero velocity in the +x axis. The velocity versus time graph of ime8mc l3ja60 pza3* eos*r b: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 accelerationf4yt4 f9* ofq*bya( jzl3/fvb in the +x axis. The velocztf (lvb *jo3ff944yafqb y */ity versus time graph of this object is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The slope of a position verbzy96 u*pi:chndv/0/ajj + kusus 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 dgs 74)s2dmkqgraph 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 accel dx(nolmc p5888 bwrjb75 (tumeration 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 ver*26gzp *u .npdadgtk 0sus 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 ek9ecs,5b 5hq6,.oe q1g3uhlb/ z tvfline, the object i 5.lv,cz3ee,oeq5bk/hus h gq6fbt91s

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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 timeec hgy/q md/*4 graph of an object is a vertical line, the object isg /hm/4 ey*qcd

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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 time5qik 2o*d .w r.m*t8ltl:sxo6.s lubj graph of an object is a horizontal line, the object 25*r8b t* dsxw .oujtlm:.6.iqlsoklis

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity versun7 e4whno6mbeph ;n; :s time graph of an object is a straight line making an angle of 30 degrees whwne 764mnp:hb;en o;ith the 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 botycfxbbsla j/h)03j6;h the distance traveledyl0s c 6a j/b);jxbh3f 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 water. How long will it takgg8; p72xxft i4 b(wcce to move 12 km upstream in a rw(27fc4pbxc; gtx8i giver 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 9;qj qeku(8jh m/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 average speed in order to trlwg,mk/: q c5v)k +3gwacart .avel 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 (approximatp7t4dl 4o,sj wely 42.0 km) in 2 hours and 57 min. What is the average speed of the runner woj ,lp447dstin 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 40ph+t i2b 5:l m)yno*mlwx( 3fw0 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 trav(zxsvpx5/cx -gvb:*y els in one year. The speed of light is 3.00 x 108 m/s. How xxv5- *p/ bszgxv y:(cmany 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/b+. huw cu7e*/l ybj0vh along a straight road and you look to the side for 4.0 s, how far do y0l yc/uw bv+ 7hbue.*jou 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 mm bjxg :rdouca--w007 ), in 100 s, your average velo0ram0:cjgd-b u-w7x ocity 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 (f(,n ,dirbvkkm east, then 1.0 km north, t k,nb,f (v(ridhen 1.0 km west to return to 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 Norx lqjixep70leg)r7p -vv..h3 th Pole. It travels 1.0 km south, then 1.0 km east, then 1 h3v7gqrj-x7.p0 e.)xivplel.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 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 fo54 xitri/9sh ar 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours ai9/5 hs4rx itand 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. z/eq1o,,z3 j c r6e. vveoq(jb What is the average speed of the motorist fo(6reojzbve,3z q/ 1e.v joq,cr 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 a)m b)bs) fk*lc:wijg tcv642 et 100 km/h. What is her average spjicmvf)begls b6 w24)k* )t:ceed 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 1aaik3lc k1y(l/z uq ;mi/h north for 750 miles. What islc ; l(aqkku3/ zia11y 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 who runs the lastb4f162 s btyvv 100 m) for team f6 btbs4y 21vvA can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m in 10.1 s. What is the largest lead the team B runner can have when the team A runner starts the final leg of the race, in order that the team A runner not lose the race?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car decelerates unifooed b 3lh(6 m k b;p2e.zyhy;50kcs;marmly and comes to a stop after 10 s. The car's average velocity during deceleration was 50 km/h. What was the car's deceleration while slowing do;pcmh(bb20al;zeykk yh65mo3e; ds .wn?

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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/ 08r2 lewhx :af-:f:nm6l bglrs, at the average rate of emf h x8:6rr0-lgla bn:fw2l:$15 \; m/s^2$. 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 at the rhq: 7zbhckl;9calek)s)x5ffn4e/ t *ate 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 a l hc3 4ujb,(sb.t7qqf yodi4k-2m .hdnd accelerates at $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car travels at 15 m/s for 10 s. It then sp ,r9x(rigc g:ridd.wnuxr8x4 v1w( 1q eeds up with a constant acceleration or.c1,d1rq9nw iv(dw (xr x:4xg8igu r 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 5.0 m/mvt g5f/x.s7mn/r h9cs experiences a constant acceleration o r9hvxm 5g /t7.fmnc/sf $2.0 \; m/s^2$. 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 directi* 0kh-fb rc e/k -pjx2b0mx-6hnbtv6 kon) with a speed of 500 m/s strikes a sandbag and penetra0xt k*r - fc2nekb x/06vhmp6jh b-k-btes 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 launched fromo6qqof/ f2cy z,lo),/snix) x 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/icoo)zsy f6x,x,q2l/)qno f. 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 constant acceleration u cz,p .kq)bm 0dl/ g.jg)ge8wof $2.0 \; m/s^2$ 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 7x zbgik3-+:vkq*u pum. What is its average accelq:u pkzk3 *g+xi buv7-eration?

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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 undeeyc:f4st ( lbo 1qe-9nrgoes uniform acceleration. During the first second it travels 5.0 m. How far will it travel durif4 o( e-:qls cteybn91ng 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 accl ir 2x koy y7gml2mnp36f5b/:eleration. Initially it is traveling at 1:glo inrfb5ym 7 lk 32/px26ym6 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 and accelerates uniformly atam5t jgk1abmz9hw/ w0f 2/p9 m $3.0 \; m/s^2$. 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 ght i+q ,ywh))vyq: ax 5(g2hydecelerate 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 ligh+zjocbh a *28c i+kxvra*2q4jt turns green, a car that has been waiting at the intersection startjaqj + z+2a *4xk28obci cv*rhs 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 t ,pd+jzfgqa01he surface of planet X where the accelerat0dq +ap ,z1gfjion 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 khx-ior0:*7 u tc3whbon the surface of planet X where the acceleration due to g:c0 ot wk7-ir hxbuh3*ravity 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/s on the surface ofyu+7ro /-.fz t 5hpbgoxvva(;bg;,va planet X where the acceleration due to gravity is ;-t+ xu ,y;goa/ vzbo5(hvgp.vf7rab $2.5 \; m/s^2$. 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 w:b(evj4v,yh phq yz+:ith a speed of 14 m/s on the surface of planet X where the acc(p,:jvy4hbqyzeh+ v :eleration due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Human reaction time is usually greater than 0.10 s. If your friend holds a rule) nhehu+hx;4jr between your fingers and releases it without warning, how far can ye4)x+;hj hhn uou 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 upi6yl cj5bu639m a ,yof 19.6 m/s. What is its velocity after 3.00 s?9ymluap 5icu6 j6by,3

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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 rw3 cdw;lx5a62 ev6au initia3w66d uwcx;v aear5l2 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 straigz3kenkak0 o*rt,d* ). uu ,gqmb h1rg9ht up with a speed of 36.0 m/s. How long does it take to return n,3.rk )go0 gt*aud z9e1kqkb,mruh* to its starting 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 dow3-utv v8+q93addr vrs nward 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 building3 9qur-av3r dsvvd+t8?

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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/sakv0. vt k0x2k;ar pt9. (only fill in numerical value i vva at0r;kt9x.2pk0 kn the 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. (ubxqc m1 fen )k2g1c*/only fill in numerical value in the blank) /ge)*2m c fnc1k1buqx
(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 velocitjl) 3r/db9ezm d*wl6rojcy0l z;* ul1y 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 tvour6u1qdsu4-oct85h +* kea 1lj8 x * oz4tbfhe velocity at t = 2.5 s?


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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the velocity at t =sb8k7b 4.wbwf 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 velocitu p/a*kiz3;zy y 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 isk n ,a /cxs6 )ahwsktnn:y99z4 the average velocity from 0 to 4.0 s?


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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the average velr)6ln3ff 5 2t tfab4jpocity 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 atje f08ldwwk(. 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 3.0 sos.dh7j 60*4hia:huc(rf3cdqa/ g b k?


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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 sjo(w7 l4 fg7nm?


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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 fr+ b8lb,h/r+ l8dtg xd;xybr2q om 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 the7 ke:cwzdwv c 0c(zii,n e+m(5 displacement from 0 to 8.0 s?


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