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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 i z .w1*(u0q oeif r2rujx)q*bgn space to another. Make a comparison between the displacement and the distan0 fozqu bxqg2r( w*ir1j).*uece traveled.

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When is the average velocity of an object equal to the instantaneous v 4 atxvcz7a9 52 6evy/p5dh mmj+ns,zgelocity?

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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 th5 jx3hxfc ky49at their car can go "from zero to sixty in 8 s". This is a descrihjck5 y9 f3x4xption 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 ang 2 tp.v(pny)u 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 t* 7w- 7 +jjjyuqpmnq*mo the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its accj*m ywjq 7u+jnm-p7q* eleration.

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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 travex8gj-whwf 9l 9 :dp0muling to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its accjwf p89-gmlu9d h 0w:xeleration.

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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. - t* : xfjes7fw9.lk;lcv5q rf Make a statement concerning its accelerat :t5fq c e*w9fvs7rjk;l.l-fxion.

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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 is6kxr* plr mkt:b09k+ig (l;hb zero, does it mean that the acceleration is zero? Support your9 :bk6*kk m+(0ltglbp;hr xir 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 direction when its acceleration 2obqg7swhb*y td8 /u2 is constant? Support your answer with an ebw tog2h7 b/y*d 8us2qxample.

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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 acceler d q+/ ts5ycbqk7qm7ek -x3ypp*n2v4 ration. Make a statement concerning its motion wi qdp+y27yexk rvq b47tk3 s*pcm n/-q5th 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 decreasing? Supp/n-)vel :hw +dlnq3n lort ynhn+ :nd)q3elv- wl/l our 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 d sevt7yk60s+ mlf u*j5w.h;);ye svdinitial kick, moves up along a smooth hill of ice. Make a statement concerning its acce; 7y5;vey)fus+6vs.lmkh 0t* w eddsj leration.

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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 aiwt j5n ;)x4 nh:wim/ ,y/osaequal to the average of the object's initial anm) nw: //a;o hj, iwxt4nyia5sd 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 accjg0kf18 e0c; qdqr9 cxelerate at the same rate. However, object A accelerates for twice the time as object B. What is the 1q ; 0gj0 fqkdcecr8x9final 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 the same rate. 3h2vb k2+9t4o jed4lw hhkyag74sb :p However, object A accelerates for twice the time as object B. What is the diohkjk 9agt s:pd24ew+4h3l4h byvb72 stance 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 and falls in the absence of friction, whichdv;l/6d-wt jp of t wddljp/t6v-;he 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 0rr,eyf:8d pj ez rvu6s+8;j po cj)y4falls in the absence of friction, which oj6) :8 s;jjud8r re0o pfv4 yzyc,pre+f the following is 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 a statement about f ;jw e,qr6r,pthe velocity and the wf,q,p6jrer; acceleration 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 straight up. What imatn3ii, qrzw 055*5s zp:supg+vg1rs its acceleration just before it reaches its higheswag *+u: sgp p0vz3zq5r, n5siri5tm1t 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, then fzbezhz3/: jaxp/kd / a2 7nt2malls to its initial heightz/:e d2 m/2bzpkjna3z/xt7a h . 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 straigpmem/7p* qx5k9qf/3 mtz 4detht up, reaches a maximum height, then falls to its initialt /z9 md4*7q3/xmmetk p5pqf e 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 downsd(1olku 7 yys-btp*4ward in the absence of air resistance. Make a statement concersl* do-ybp4u(kt s 1y7ning 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 o.wxy9 jm f6wl,a:,hgfrom a high-flying plane. What is her acceleration when she shogxh.j, :m6 y9,walfwe 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. ivpx0+uksb* ;20 w-9ab bpp.ar+gl,h jxiac8 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 times higher does the second ball go than the first ball?ihab, vp b*8ip ;wp ub+gjx0lk2aca 9rsx-+0.)

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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 oa1b5 ; :+lbs)qnbqs+w4 udi0oopp/tff a building. One second later, ball B is dropped from th)5+/f sql1n :i tdpo0bso4+bqup;wab e 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 buqz3o iin:e9 1lilding. One second later, ball B is dropped from the same building. As time progr:3z1nli o9iq eesses, 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 4gx am3tcm34 jtall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when the ag3tm4x3mc4j y 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 sec ba;cb)kj:wk0iex 9 s*ond brick is thrown straight down from the sae0i; swkj*b ca :x)9kbme building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with const 6p4qk8h t/n9nr7 bdppant non-zero velocity in the +x axis. The position ve /npqpkbhdpt8 nr67 49rsus 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 acceleration in the +x ax*ks v/0vadp (w63yscgis. The position versk 6syv/a (dcsgpw*30vus 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 kza;gw3 xg*q8c4fiyh9t. z 2dwith constant non-zero velocity in the +x axis. The velocity versus time graph of thihi8.kf; d g 39zt4yqwa 2xcg*zs 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 ac qhxh2 5btcd1sav-pe2 i8y45jceleration in the +x axis. The velocity versus time graph of this object isajv s8c24dip1b h 5x5tqh-2ey

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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 positik wwt, p/*4-a -hbnqgaon 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 x 9byf (bwygne5q8)rs;o:*ur time graph 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 curg 8y i;ook gf5/a1ey3lve in an acceleration versus time graph gives

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under a curve in a velocity versus time graph gi lfktb)p 6dsqh 794y3ydu,+xk q8y dwr5 /ygn5ves

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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 hpk jklt.wt)6+p kq0 8-ate6lc orizontal line, the object iskj)t-8pt+e6 .kwl6q0cap ltk

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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 gk8/ojcy2(fif c9ms ,gs9d)cqraph of an object is a vertical line, the object isjfsm)cg,9c 28 y(qd9 ios kcf/

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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 gey+ 44aq 5syz3yxds to7j1w(in qff,6raph of an object is a horizontal line, the object isswya i f5jeqsdy36o 1 fy7txn4( 4z,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 syp;weplw/ou+7q 7rt / ;*scl ctraight line making an angle of 30 degreqpcc+royl l;7t*e7s/ pw wu/;es with 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.pyefg x5xi3()ts*l zlvs3iu aw.u)5; Find both the distance traveled and the magnitude of the displacement vec vxfx*a.5ewu53is)s gu zy3l; (i)pt ltor.

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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 sti 1r)qmkzeu ffjvv a6g7r-4z/:ll water. How long will it take to move 12 km uz:f46aue rjf1 zv- qvg/7mr )kpstream in 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? (fd2 m3yze;; mr1 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 m:z bd,s;6og+;k.pmvfv ln;w 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 marathoh,of93 8;q.baygmxz zn (approximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in m/s38.o 9fzbxah g,z q;my?

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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 400i /ne1hs;scwxyw g5ow w2490j 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 .c7 o.mg 25px2gpfgfvone year. The speed of lightpo.57g2g2 fmfcg vp.x is 3.00 x 108 m/s. 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 b(mr* u8: yzrmlook to the side for 4.0 s, how mr:(u*y8rm zbfar 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 ave.izq0ziwgyx 9i4: dy.rage velocitxq 4wi..z0dy9 gi y:ziy 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 travel3 ge7 -jj 9z 9j;by,tkyy*pntps 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. Thikt 73pyj,j p;*b-tnjgez9yy9s 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) ,tl 3lzka(sv. 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 poilv3(ks,tl a)znt. 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 bfrg fw2mlpec+4d;1aw9oc ;a 0*72jvo js/kna weekend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You aja4bg;o9+sv m *;cfjknc/ e1parlw 2 w270fdorrive 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 160o2 g (/c1a6oeutxrq5 d km at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for thisxeq c/5ud1rag2to(o 6 trip?

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/hnelfm7+ f0f6t. What is her average spe70m6nflf+e tf ed 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 30xx eazd2 4kos0vf*9 -n0 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. Wha09xe-4 k*fadzs 2ovx nt 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 who runs the last 100 m) for tea8z6t a;x0+;tzkgffdpmj2rdfu). cxj m * hz;. m A 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 f 6.jhufzt0dtxj; kp+ z )8mzmrd.f;2;xcga* 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 uniforml5pg 9++bm -yagix.abvy and comes to a stop after 10 s. The car's average velocity during deceleration was 50 km/h. What was the car's decelerationgi+yam9p .+5bgav- x b while slowing down?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane increases its speed fro 9 j 6m u mhxkcc,caj6p3(;-ii3dtpe2xm 100 m/s to 160 m/s, at the average rate of 6pamxc3c- hkpi(,x i dum3 26jct9;ej $15 \; m/s^2$. 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 rate o+pla bgl6xzhv)+ffhj.xbb8 4 2b *h(df $2.0 \; m/s^2$. 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 accelerater96ofj hbuzr + n: t54ele7x8ls 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 the o pj5d-y; mf7mitfm g)u;h6)hn speeds up with a constant acceleration f;yitfm-uo5; hd)7g6 mj)m phof $2.0 \; m/s^2$ 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 constauze;cq kvzyj /.4z.d1 nt acceleration of e. czv ;jkyzzdq/u .41$2.0 \; m/s^2$. What is the cart's displacement during the first 6.0 s of its motion?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bullet moving horizontally to the right (+x direction) with aamn hq9ox -50r speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm. What 9mqr-h 5naox0is 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 la8/9xd2 qkpfn/s g*k3w ostu7wunched from 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 skgfs92w78qtpdo/u s xn w3k*/. 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 of efp+jm2 kmsgk;l2 -8j/-ljpi $2.0 \; m/s^2$ for 10 s, then travels with constant speed for another 10 s, and then finally slows to a stop with constant acceleration of
-$2.0 \; m/s^2$. How far does it travel?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car goes from 40 m/s to 80 m/s in a distance of 200 m. What is it8 g4bctsnx ..ys average acceleration?xs4n.cy gtb8 .

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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 pdja h+t 3q)t:jf)t;xand undergoes uniform acceleration. During the first second it travels 5.0 m. How far will it travel during the ttqdh tx+)jpjft )3;a :hird second?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving in a straight line with constant acceleration. Initmfdpi) 472il x-s i0ys uc*kr1ially it is traveling at 16 m/s. Threlri7m21-pi4c s *x)kfs yui d0e 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 -v*suqn-5ixnkptig9 : 9yj9fch7 i5euniformly at $3.0 \; m/s^2$. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at $5.0 \; m/s^2$. How long does it take the second car to overtake the first car?

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70#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A car with good tires on a dry road can decelerate at abohb zbn;jbs0v-t21pn- (fj8 k out $5.0 \; m/s^2$ 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 hascjcty3 xp4m7te7rw/yr0 *n q; been waiting at the intersection starts ahead *mp nt;we4r37/yr0ccqxjy t7with 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/s5mxu+k1blj9 )txd(ojef:- nz on the surface of planet X where t15)d:bex9nz (t x ufm-jkljo+he 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 on the surfac:wbi 7fj,na96bb3h m te of planet X where the acce 37mfinb h6w,ba9 j:tbleration 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/s on the surface of planet l5h*b1om.vucp0jpt2 o i7bii( - i8urX where the acceleratioh 1pr-ob.cu08io bi7tm*pij 2l(i5uv n 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 a speuurs w3+1j ig9b fo; 9dhyh9-yed of 14 m/s on the surface of planet X where the acceleration dueh9jwh31uo-g usdy99r+ biyf; 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 gret; 9g/ gcgklyvy j,)6 m5wov*-(qcojaater 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 yout jcq-5yjk 6, (go* )wv vg9a;/ygmlco 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 afc8reht46o/ yp+t,)p v lr c)ytter 3.0 e 4ht+cr/,lpy vty8t 6p)r)co0 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 p ykgweg/blen.* zmt3q : 5,(enoint in 10 s. What is the initial speed of the bull n*yng: ( 3 ltzwemek./q,e5bget?

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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 long does it take :st,w6na*02gbs k1wz 6 ha(nm1ky u ijto return to its starting pi,(:k uw nbt*ms 6g 0wkjh6zsa1 nya12oint?

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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 initial speed umi pa6x5/1j.(tz 5.w o pgygvfc/1ynof 25 m/s. It strikes the ground after 2.0 s. How high is the builfwo ap 1/i( pc x6nv5gmzu/y.jg. yt15ding?

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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. ( 3ljau4m.v y4qonly fill in numerical value iy3ulq4j. a m4vn 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 sc u1l 6f7+yxqu7 hkff+peed of 30.0 m/s. (only fill in nuffl6h+k7cxu71q yf+ umerical value in the blank)
(a.) Calculate the time required for the ball to rise to its maximum height.    $s$
(b.) Calculate the maximum height reached by the ball.    $m$
(c.) Determine the time at which the ball pass a point 25.0 m above the point of contact between the bat and ball for the first time.    $s$
(d.) Determine the time at which the ball pass a point 25.0 m above the point of contact a second time.    $s$

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the 0f6-cjme; zpy velocity 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 1y /k17bpv8(ft2 tw1myt p 6xrovwe7mat 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 = 4. r+-fr+qt7 lec0 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 isk3.jgqz:v 6,nuzs+ mr 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 isc+nj/50r5q9j nhsu.6e h;ziw 3fthxx 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 3, i*asqv539kukiwbrthe 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 s?51jppl2yi7gdwcvt-g 3n 8 4g w


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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.dd ft ;,ua v57*qchr wa/jct080 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.yyau :-b 0wtp/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 ishu.9h p l6qbt5 the average 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 displa p 1*dewq3rp):nv5y3 udgpt .ucement from 0 to 8.0 s?


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