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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: 游客未登录  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 8u te jtr1odo3qk 5.zh+f3,nuto another. Make a comparison between the displacement and the distance tra3o,u+zt toh q15 3j.e8 ukdnfrveled.

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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 ofj2al0z;e 0 5. 9c0s cnyqcvmzv an object 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 their car can go "from r z6vc6 ,mfay9zero to sixty in 8 s". This is a description oarzc 66mf, 9vyf

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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 exper w yb2efq/ 6w;l tq3+:fcqnep8)pkef,iences an acceleration of $2.0 \; m/s^2$. This means the object is

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a car traveling to the East (+x direction) begins to slow down o 6tkzos; zzt.+94 .il zmc:noas it approac:zcoz6..nzktzi9+oosl;4t m hes 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) bej;n o*,.a+6nhx1 ,k-fpqxlw e6 sgiiu gins to slow down as it approaches a traffic light. Make a statement concerning its acceleratxjq ie a66,1s+ fngk.lphxiw -uo, n;*ion.

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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 stateqy i aj a6 *wzr220lqeg6d0g9mment concerning its accel2 aew gr 2zilqa* ym0660qd9gjeration.

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity of an object is zero, does it mean that the acceleration is zeabz tf(i7vn9. ro? Support you7z9in tb .f(var 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 is const+ 0 tk,e9abmwkant? Support your answ9w 0kta+ek mb,er 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 *q0 d-bn pu)5boijcd5 moving with constant acceleration. Make a statement concerning its mon p db5ubqcj* -i)5do0tion with 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 whil59ztmbl+ ) m tpb-nw-ge its acceleration is decreasing? Support your anbgm - +p)zmbn5-w9ltt swer 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 kiji1c z )cll.q:ck, moves up along a smooth hill of ice. Make a statement concerning its acceler )1ilcqzj.l:c ation.

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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 averaargkr92bu9vl a;+6y m* hd k9xge of the object's initial and final velocit r9 2vgxkauk+lhryd*a b969; my?

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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 accelerateaamjy6n w-c0c9 dc2k-s. nd2(i6k oxn at the same rate. However, object A accelerates for twi-( m9 ciadd x co.n- 6an206wksykcnj2ce the time as object B. What 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 acoy,wqh (( a,eccelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance w ,(c,qhe o(aytraveled 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 fa((6cx)rb kgj ulls in the absence of friction, which of the kc xg(b)ru6(jfollowing 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 the absence of friction,t p jm :v(5zy du6,auie019oer which of the followinzi(ym :vo 1p0 uuee65j d9art,g 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 upz83ff2 mnnkmn kn 3k/7. Make a statement about the velocity and the acceleration when the ball 3f2n3mkn8mk n zfnk7/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 stra+kq8s ze-g1 ftight up. What is its acceleration just before it reaches its high8kg1+f-seqz test 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, thenw/j7 65 f71x odjinjwo falls to its initial height. Makei j f/dx757njj1 6woow a statement about the direction of the velocity and acceleration as the ball is going up.

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up, reaches a maximum height, then falls to its initia6+ mk5wa v5ddql height. Make a statement about the direction of the velocity and acceleration as the ball w 6d admq5+5vkis 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 d,o3fhebh1d*jyrp 3a 1le )u9downward in the absence of air resistance. Make a statement concerning its3p e3udh ,jd 1ay)bhrof*le91 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 from a high-flying pu iis* v,v(p16rzq zzkuy/-p7lane. What is her acceleration when she she reaches ter pp7(v q-s/1,ru6kz i*zzvuyi minal 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 identic;4nnh qlqx5v0uh 3/ue*p oh jln6z5i (wpjh* *al second ball is tu( wzh **qpn4*lhq/6l0 jihno5 x euvjphn 35;hrown 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 aeo rqoy61/r8p- ifiy vdk/k.9 building. One second later, ball B is dropped from the same building. As to6yr- k/f1/ or98 pieqiv ky.dime 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, bahibsbo )v45c(ll B is dropped from the same building. As time progresses, the differences h )bvo(5ibc4 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 o.ad 1pp 1n.6y1bjptf0 zr3bkpf a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the stree j1.p 6 k3p1papzbd.1fn0yr btt?

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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 bum:34uib8jlv;fux kova/q)l*fmg6 9k ilding. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air re kalb )omu8f4v/ ; xk9mjl qi3:f*vug6sistance. 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 co1 2/b3cd )gfp,w 7nsoelwdir1a nn8* m2ai (sdnstant non-zero velocity in the +x axis. The position versus time graph of th/ 2 ai*)1n8rldbpnwm osni,fs(cw2d13gae d7is 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 a-gntn gc 5 9uv20er6nsxis. The posit 0u v25 c6-stgennr9gnion 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 qoz;( s(hm-l5 ks t :nxml,,frwith constant non-zero velocity in the +x axis. The velocity vers(kfslnmt osz5(h- rxml, :q,;us time graph 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 cyevwe(ozkm0*/lsfn0rc p2) 2 onstant non-zero acceleration in the +x axis. The velocity versus 2yzf mc0pels/w 2)kv(e 0 *orntime 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 graph 5fc5*zrf6:smu xwsp, 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 giut g5 tpp-s:6ives

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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 versus time e hj9xef 9y52agraph 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 gr pkkm7 2imnvc5dy)50u aph 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 objzxm6)k xrx /1nu-yl8 aect i/ xurm)zy6x k1- 8alnxs

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versus time graph of an object is a vertical p;k*intfrtuk rh 2)bp y:s81/line, the object is/h;8*kb rp: )2f1tt i knrysup

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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 v;t p2cyx)zx* y8nbuwh (r01dc4 -kw8zvxs*ba horizontal line, the object is2)18xnc w(;r 8*b4czz*xpvu- twyk v0h dxbsy

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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 making poj/r*o/ ) ic 2tj 69ccm53cz)yipgqaan angle c /tz32gmjrj9cq ip5 c)i*c/o)y6apoof 30 degrees 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. Find both the distom2-2gutwf**ms xufbe, +ijjc p+: 2oance traveled and the magnitude of the displacement vecto+c j-so b*m2t2mw:x+,u2j p fi*efougr.

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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 stillcoc nbu, c2h2 ep8lh,2 water. How long will it take to move 12 km upstream in a river flowb8un c22eochh, ,p cl2ing 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 = 160 dciec)zd/. l-9 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 trav.zu :r3h2-0g+rd sli3x2t p gfcst uk;el 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 (approximatemmuzzzic drhv/*kl* 886gt19wqg ;3h ly 42.0 km) in 2 hours and 57 min. What is the average spzhm6di/zk* * zt 3gl8rm1hvuq c9w;8geed 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 dohp4tlv il c5t-v9n.ugs.x-q 0es it take 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 in joi1vv g eh+ 4kcz:wv2*e 8ly(one year. The speed of light is 3.00 x 108 m/s. How many miles are there i2ik(:ge4l 8wc vz*joe1yvvh +n 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 side cf0r o(a2 wk )zh z7d/7pvu*mmr+bxk4for 4.0 s, how far u ox7z 4baz kv*0)/ mhp2cwr(kr+f7dm 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 100r0w4t;rix .yy s, your average velocit wyx4iryr;0.ty 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 mxkj/0:fr(f w 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 speed?0j(k: xmffwr/

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A polar bear starts at the North Pole. It travels e6cr(hyee3gl- (5l2r ya)ias 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 bea3h )a -6gly2sareiey( (5rle cr'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 fl(x qc.q *ceuk3pww3 d-q:j/uor 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 hometoqq cuulwpx (-3d :*ewj/k.c3qwn 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 80y, um6dr1oi+ab- h884l irflx km/h and 160 km at 100 km/h. What is the average speed of ,dy+r4 iia xbohr8m ull-68f 1the 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 2.0 h at 100 km/h. What is0 tivstsaor-9/l f vo r29q9e5 her average speed for -oil5s/vs2qafro t re0v99 9t the trip?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h hv0;m m 3hp.tpnorth for 750 miles. What is the average speed for theht0mm v3h;p.p 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 wh4nnioqe- 2j- jo 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 10.1 s. What is the largest lead the team B runner can have when the team A runner starts the final leg of tq-4nojjein -2he 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 comesftf099ct k 6vo +h.nib to a stop after 10 s. The car's average velocity during decelerati otvcn. fhk09i6t+9 bfon was 50 km/h. What was 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 aq d1wx /o fxt 91bd(i8vno;9dspeed from 100 m/s to 160 m/s, at the average rate of nbxa8d d o9; tv/(x1d9wfqo1 i$15 \; m/s^2$. 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 acceleratb frl 0o2ec vrxd0q8:(es 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 accelerectu ) uo;mw/ 4ur(sa)ates 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 consoz ) f +z:m h5gre:fm0li3(a ywi/xv7utant acceleration 3mvfi5 /am70r)+fuz:lw: h zxy(g eoiof $2.0 \; m/s^2$ 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 veloci(an89 v fpnmf3ty of 5.0 m/s experiences a constant acceleration ofpna9nf(83fv m $2.0 \; m/s^2$. 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 al4 s-4:-.ahzwt8ge tvnj gov( speed of 500 m/s strikes a sandbag and penetrates a distance of8vwj t4: 4hggs. -a- vnlo(zet 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 from a catapult on an aircraft carrier. I5/opw487cjsrentkvg5; v6 t q gwjo;+t reaches a speed of 42 m/s at the end of the catapult, and this rtop86 jv45 w ;c +owjs;e7gnkg5r qv/tequires 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 constant accelera ph*5n /gx)e--qi4,db friok7dhk0 jftion 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 m/s in a dist o;fce o.;-y99cuqidh ance of 200 m. What is its average accelerationoi-9o;; cu9 q.e hfdyc?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object starts fromf-e f cibv+.l( rest and undergoes uniform acceleration. During the first seb ( l-.vicf+fecond it travels 5.0 m. 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 straight line with constant acceleration. d jb8c vox):xdjw-8 v2 Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move xvjb -)vojdx:d 2 8w8cduring 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 ac55wbo 42hao ,p,vktoa celerates uniformly at $3.0 \; m/s^2$. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at $5.0 \; m/s^2$. How long does it take the second car to overtake the first car?

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70#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A car with good tires on a dry road8rqg31 df2 uuu 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 jx j-60g6dao;m9;sd kalyj f1 car that has been waiting at the intersection9ad6xfs 6dy;mag;k j l10j-j o starts ahead with a constant acceleration of $2.00 \; m/s^2$. At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.
(a.) Calculate the time necessary for the car to reach the truck.
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.
(c.) Determine the speed of the car when it passes the truck.
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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a sfbbofg pa25px4..;o m i b.x9npeed of 12 m/s on the surface of planet X where the acceleration due to gravixop4a9bx;oif2f.p .bg bn 5.mty 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 upwa(7we5ew.wm u zrd with a speed of 12 m/s on the surface of planet X wherewwu5(.7zm ee w the 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 upward with azn2p4 sbju3 1 -oxjb3h speed of 15 m/s on the surface of planet X where the acceleration due tj3-412h 3pjb zbou nxso gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 14 yq-w 3 z9opez.m/s on the surface of planet X where the acceleration due towq3 .pz-zy9oe 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 g1snplq0z)*pdzf0 . jukzdb2 x c-n5*q65 kcurreater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruz6nf0c *1jndu0r5*d 5.l csk2xbqp-upzqz )kler 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 1i;vz2m9bav+vv;6pv l9.6 m/s. What is its velocity after 3.00 sv+m;9ivpv ;2v zb6lv a?

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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 geavmzyol6 *es (, xb6f+)h i4point in 10 s. What is the initial sh* o6g4,mz)beys6+ai( fl evxpeed 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 9jfa *6 gkjdz98wkqz7.0 m/s. How long does it take to return to i q6k9w* 7jf zakdg98jzts 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 downward from the top of a building with an initial ah4cpni723 y lspeed of 25 m/ hay3cil724p ns. It strikes the ground after 2.0 s. 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 3wj7ldkc; l5p+ .w- ckicabv, speed of 30 m/s. (only fill in numerical value in the blacivd+ ac,37bkc5 j lpwlk-w;. nks)
(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 mgmk( v, -+ 08avfyjwml 9j)rum/s. (only fill in numerical value in the bl ( )j+fwy lkg-8amju m,0vvr9mank)
(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 akbem6 vbj 7itti;hv l9-1b,t cw-q 6r/t 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 adi+ jsg 9qw.r9t 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 at9cf*(gllrx /i(ta( hr 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 velocit3 vkwuv1vu-5s 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 is t8 xktfjv 87yp+he 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 velocityscaf-*5 4owqf 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 atphg qvqn0ago -m5zmrxr()+)tf 5s, 4 x 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 accr e*0 eiay,4l. *pzauqeleration 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 accelera 6l(hs7d rmn:mtion from 0 to 5.0 s?


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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the average acceleration fromtye*w,p:q; f el u8au6 i9ye8a 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 38ohznr82gs rvj yadt) ,d, 9,lvsjn++0fu pmto 8.0 s?


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