Suppose that an object travels from one point in space to an2g gwjtv2 lpiih)-2 p1xtk44nother. Make a comparx1g4-g 2lwii2tv jh4pkt2p)nison between the displacement and the distance traveled.

  When is the average velocity of an object equal to the i6 yojyc*g wi*/ q lnhg.sqe.3*nstantaneous velocity?

  A new car manufacturer advertises th5a1i nct v) ,smh;z(zdat their car can go "from zero to sixty in 8 s". This is a descm5vtd;zahi( s nzc,1 )ription of

  An object moving in the +x a8r nj+r/i -,bqjhh/ maxis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x directionu 4aew/nw 9sbtp2(np3 ) begins to slow down as it approaches a traffic light. Make a statement concernin9tuaww3pbe(s 4 p/n2 ng its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow dow4 u)j7b ybdc.cn as it approaches a traffic light. Make a 74y)bcdcbu .j statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a ssq7 qsu+hq0nz ceg k7x o2y,:lps38, rtatement concerning its acce7ky,ngp +s ,37cs: xhlroqq qz es80u2leration.

  If the velocity of an object is zero, doe h71 ybrc/e;hcs it mean that the acceleration is zero? Support your answer witce7 ycrbh/h1 ;h an example.

  Can an object's velocity change directj j u9e5gi4w.s58dfa tion when its acceleration is constant? Support your answer wiwu5 g. 98j5jfta ie4sdth an example.

  Suppose that an object is moving wnrq+40dc ) un(o +ya+xpvc;pr ith constant acceleration. Make a statement concerning its motion o+cp)a c+(n xqd+ry4;pu 0nrv with respect to time.

  Can an object have increasing speed while its acceleration jppe,l/y9lw2 c9v tqe+nnb* 5is decreasing? Support your answer witvq,pl9t p2 +e9nyc*l ejwnb/5h an example.

  Suppose a can, after an initial kicn t pbg5h(q af3c34-yhk, moves up along a smooth hill of ice. Make a statemenp(aq g-chnh 34fb 53ytt concerning its acceleration.

  Under what condition is average velocity equ2 b y.r4-.r(8lc4zeqm-n9 :jys uvfjb5ee a wqal to the average of the object's initial j9n qjy c-.ebewf.yze2l 48sm-qa :4rv5 (urband final velocity?

  Objects A and B both start at rest. Thxf4u gia.u lq)+p )q2key both accelerate at the same rate. However, objecauu) .+p24kqqi fgx)lt A accelerates for twice the time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the nc2su8:g9b r f3hxrr9 0p ;e.d ypeg(dsame rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compa 8u:;(egxd gc.9r92pbde h3nrsfpry0red to that of object B?

  When an object is reo0ex 7wn8:hh3h4*gnto8 aqfb leased from rest and falls in the absence of friction, which of the following is true concerning ino 0 qg:b3 884 enx7ht*foawhhts motion?

  When an object is released from rest anozh-abk+ v(0d-fzdo5;z v9 psd falls in the absence of friction, which of the followinh95z vzd+;b-o0 pdz(kfov- asg is true concerning its motion?

  Suppose a ball is thrown straighs6tbn57duzlkg m)g* +t up. Make a statement about the velocity and the acceleration when )gk*5t nlu7sz bm6 dg+the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its aizzs ecfq6.v:9 )-6sot 1ayfe cceleration just before it reac.czo zetf66q -e s:1)fay ivs9hes its highest point?

  Suppose a ball is thrown strkfe i+g7::kz qaight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleratiokkiq:fg +z7: en as the ball is going up.

  A ball is thrown straight up, reaches a maxnu 2f0iko5ehm r 4 jvs 7c(fg3to:a,q,imum height, then falls to its initial height. Make a statement abou7ffqgcs,4kjtuie:ov 0r 3(n, o mah25 t the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistancrd1-ok wdu(cz7nbr:xyz/ b.+ e. Make a statement concerning its accel/+ ry rocd1z-7d zb:. xnwkb(ueration.

  Suppose a skydiver jumps from a high-px pl b i5rw8zllc1p 8k.z86dl l2/f:vflying plane. What is her acceleration when she she reaches terminal vel2ll888c f r 1iwzpv5 px: /dlzkbl6p.locity?

  A ball is thrown vertically upward with a speed v. An identical second baffzuu -7qd 23 vnwf)5all is thrown upward with a speed 2v (twice as fast). What is th dw32f uvaf7-)5uqnzfe 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?)

  Ball A is dropped from the top of a building. One second laterd(gz9hycu/ owlwh5:1g )(iqc, ball B is dropped from/5go(9y:i( 1g hchwlquz cdw) the same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One gnzr/r.(b4 qlsecond later, ball B is dropped frnr. lrqgbz(4/ om the same building. As time progresses, the difference in their speeds

  Two objects are throwibz7 6hw/rdx/ n from the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are ther/7wdibh6 x/zir speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick ixz;bzzwv(p pi5, 4h(y )yjs q.s thrown straight ) szqxiypj ( 5vh.wb(p; y,z4zdown from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocit:: wfoy phip:) ib(y*uen+a :zy in the +x axis. The position vers:*y fp) y: (anui::be+zhoipwus time graph of this object is

  An object is moving with coh/* ozp/,ocy-p+v g1 u0iw pynnstant non-zero acceleration in the +x axis. The posipv 0*yn,z/pu/w-o pg+oh 1iyction versus time graph of this object is

  An object is moving with constant non-zero velopcw(8y :rmle7y*m(m m)gwvy.h gge45 ;.v wns city in the +x axis. The velocity versus time e nmlrw()w 85vyymc7 pe*gy mmgh (wv.:s.;4ggraph of this object is

  An object is moving ava,:qf1o:lgit/ wk ;hr2 st:with constant non-zero acceleration in the +x axis. The velocity versus timetq:;a ,ifvr go/tskl1 hw:a:2 graph of this object is

  The slope of a position v/imq)ru : /cp4q ltpe3ersus time graph gives

  The slope of a velocity v65xi*e eot 3myersus time graph gives

  The area under a curve in ts0-tq3dhio 2j0+vnb97 ikqnan acceleration versus time graph gives

  The area under a curve in a velocithp,a5.ka3g m ux sn+*gy versus time graph gives

  If the position versus time graph of an object is a horiz7vs/r ,lnb l6 y2h/evd+ sti1vontal line, the object b1y7,vvs r etd i6+slv2/n h/lis

  If the position versus time graph of an object is a vertical li0o cmzz:jr949k8 znkpne, the object isz9 po84:k9 zzn0rkmcj

  If the velocity versus time graph of an object is a ho/zzwsm.qsoxy7 )87 f z4q x /gavn(o6vrizontal line, the object iszn vo a8 q7q/x /4mvsg6)xyf.w7zoz(s

  If the velocity versus time graph of fo pqgwtihgmh8 (57.p 4q3ib3 an object is a straight line making an angle of 30 degrees with it73hofp8 .4gghb p3imw5 q(qthe time axis, the object is

  An object moves 15.0 m nort)fc395xbk emaj9o0ktd yr-0k*dj ld2h and then 11.0 m south. Find both the distance traveled and the5jxjkef9ao r3m klct-d* 9b ydkd0 0)2 magnitude of the displacement vector.

  A boat can move at 30 km/h inkgw,yx j p7+1)kk454oh oqe fs:lgxh6 still water. How long will it take to move 12 km upstream in a river flowing 6.0 km/k7wpgkq+ 5 6eyx)lho1jh f 4ox4:gk,sh?

  55 mi/h is how many m/s? j.44hhr9vhpo+oh fobadc(60rt pep:vr: : p((1 mi = 1609 m)

  What must be your average speed in order to travel 350 km in 5.pw5hxf /;3g3* x ygzw w)4 ntgkpnbz3qv3s 0k415 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hv.*ttzz 3 yz yn1hl*t spph:/-7ea dq0ours and 57 min. What is the average speed of the runner in m/s/1 he tdazsz 0 ylhv :p-t3q7y*.*ztpn?

  A car travels 90 km/h. How long does jdyi gilno.5l c-+vg2;0fig .it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one d+jblj; gvk2d1 x1p)vyear. The speed of light is lx)1djvbp2 k;1g d+j v$3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/h along a straight road and you look to the si/c 8j*1n adkpie ngz g1rq5:k+de for 4.0 s, qz85 an11k+n/e* kcgpigj:rd how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), clv c sg0y-0c6in 100 s, your average velocigc0vlys 0c -c6ty is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km eas n6z pz d4ipbn(rteeou1 r 5.7:u:lbr3t, then 1.0 km n.5eur7znep3npou ::b ( z1dbi4lrt6r orth, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. 06 u)- o3ufr; osxdjktIt 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-uo uko)xt60; jdsf3 r min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h fork ; tx7-kgc4p8jkzjx)4u zq 3s 110 miles. It then starts qkjtj48 z uxk x7psz4 c-k);g3to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km55hizp kda052:bx m cq at 80 km/h and 160 km at 100 km/h. What is the average speed of the mkmpci b:0 5hq5xa d25zotorist for this trip?

  A motorist travels for 3.0 h at 80 km/h andn/2 j/3: wk-ogfwdibq 2.0 h at 100 km/h. What is her averagwkio/w- / :d2f3ng jbqe speed for the trip?

  An airplane travels o 3 oqn/s.knb8at 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the averago /s. kb8q3nnoe speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m))u.dw -3r gxvy 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 thu3g. y-vdrw) xe 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?

  A car decelerates uniformly and comes to a stop after6ajfje03nq/jd bv 2550d8 oclsng b-n 12 s. The car's average velocity during deceleration was 78 km/h. 5 fjn n-c60 jd g3085njvq2albs eob/d What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the aveo+ugz )x cfdv rpnv71s/m --k/2f5snsrage rate of gfoss2 5/-nvc/kdr 7) pux+mvz s n1-f$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h n xwmpl/ jiy,ddfz0)3k+3q7(vfai ,xaccelerates 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?

  A cart starts from rest and accelerathg/7 +2t bdm qw 9i+goaj1,azdes 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?

  A car travels at 15 m/s for 10 s. It rt0 zge1a/pq.then speeds up with a constant acceleratione0p /1.t razqg of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial rf hid79f5lu 2velocity of 7.3 m/s experiences a constant acceleration offi9hud5f rl 27 $1.6 \; m/s^2$. What is the cart's displacement during the first 8.6 s of its motion?

  A bullet moving horizontally to the3,l0 1fbdfoot right (+x direction) with a speed of 316 m/s strikes a sandbag and penetrates a di01fd3fo b,lot stance of 53.03 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is7vthlw ,/i3i n*vsqx , )9wdjd launched 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.jtn, l3,/d 7hd*sv9wiwx)qiv0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleration oswavf8p*exmkfi. 5ui) /, f2 pf $2.0 \; m/s^2$ 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?

  A car goes from 40 m/s to 80 m/s in a distance of 200 m. 6td4gzf 1yd 5mWhat is its average accele4zdy16mtfg 5dration?

  An object starts from rest and undergoes uniform acceleration. During the firsir.z zpofvya*3/ .dc( t second it travels 9.0 m. How far will it travel ddpzc y(3. f/a.i*rozv uring the third second?

  An object is moving in a straight line with 5o,xwxd h mvb1v8lg8 *constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during thmolxvb1 d *,85 8xvwghis time?

  A car starts from rest and accelerates uniformly lb + 8 wafu370idg(tvzat $3.0 \; m/s^2$. 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?

  A car with good tires on a dry road can decelerate at e6q;)g)kfkbv p/e,3sgg m fy2 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?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ ((only input numerical values)

  At the instant a traffic light turns green, a car that has been waiting at twii 1m+wq+gx (he intersection starts ahead with a constant accele(mqi+ xw1+wg iration 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.    $s$ (only fill in numerical values)
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.    $m$ (only fill in numerical values)
(c.) Determine the speed of the car when it passes the truck.    $m/s$ (only fill in numerical values)

  An object is thrown uppuyn//+1;dxk0 mlz fwward with a speed of 12 m/s on the surface of planet X where the a/y+p;kl10 xu/zm wfn dcceleration due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a kt xnxsz / 0duh2b94-/dk uvf)speed of 12 m/s on the surface of planet X where the accel k 02f-xx)s9bn/dtdu4z v uk/heration due to gravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upwatzz fcn*67 q/+ujmu4rhybd8:rd with a speed of 15 m/s on the surface of planet X where thrbf6 u*m4jn7z/+t c :uyzq8 hde acceleration due to gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

  An object is thrown upward with auum 9epsfvn;4+ds1 djygg. )6 speed of 14 m/s on the surface of planet X where the accelera de6ufndv+;gs 94.u)m1ysp j gtion due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10 s. If your friend holds a ruxj6/uepkd3 j(18ly4 ftq z,jrler between your fingers a j/8fzxt l(,1uk j63ej yrp4dqnd releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/: vva5 +yeyfc:s. What is its velocity after 3.0cv:a5y e:y v+f0 s?

  A bullet shot straight up returns to its starting point in 20 s. Whawpk lzst;2si6 5/ kwcj4 g.;b; oax+yut is the initial speed of the bulle2yt/4p 5 l ;;ujb.cx gsi6k;zo+wksw at?

  A ball is thrown straight up with a speed of 36.0 m/s. Howr )y: sotht5*l long does it take to return to its starting5:sy)h* ttlro point?

  A ball is thrown downward from the top of a bu8sil42 mb)3re,9b;qx1rhqz *i ru znuilding with an initial speed of 25 m/s. It strikes the ground after 5.5 s. How hig1u3i e9m*qr;x4uqzzib)8 2 ,rsnrblhh is the building?

  A ball is thrown straight up witubu1,m+b+ srcl6a1 vv oba v.)h a speed of 30 m/s. (only fill in numerical value in the blanks)abvl .cbo1a bu+ sv,mru+6v1 )
(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?    $m/s$

  A foul ball is hit straight bdi5et z32-cvup into the air with a speed of 42.2 m/s. (use $g=10 \; m/s^2$, only fill in numerical value in the blank)
(a.) Calculate the time required for the ball to rise to its maximum height.  (数值)  $s$
(b.) Calculate the time for the ball to fall back to the height at which it was hit.  (数值)  $s$
(c.) Calculate the maximum height reached by the ball.  (数值)  $m$
(d.) Calculate the ball's speed 3 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 6 m above the point of contact between the bat and ball for the first time.  (数值)  $s$
(f.) Determine the time at which the ball pass a point 6.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t =welef.* n* uf2 fc*4s3sxd7fa 1.0 s?

  In Fig. below, what is td ,-4/f4ppbi l hmh6oche velocity at t = 2.5 s?

  In Fig. below, what is the velocity ach8xxh5a/jip tlexdet5. 83/t t = 4.0 s?

  In Fig. below, what id u0y,*u,so-sn ,mdy 2e nyj1zv nu,l-s the velocity at t = 5.5 s?

  In Fig. below, what is the average vel5 b lls12cnt;mly5ru 9ocity from 0 to 4.0 s?

  In Fig. below, what is the averagj- 2ft8bc xorah; :y(vh- pv3ae velocity from 0 to 6.0 s?

  In Fig. below, what is thumlm2n h/e9el c;x.bexae568e acceleration at 1.0 s?

  In Fig. below, what is the acceleratnmu/7yfwrer*2y 4y: hion at 3.0 s?

  In Fig. below, what is the averageh; b8i.qhgh v: acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to ef. t*1wycsy3pp s9g4u w2yi ,w/ zt.z8.0 s?

  In Fig. below, what is the disp nqtjf*2anj :i9 z8k*elacement from 0 to 8.0 s?

Does a car speedometer measure speebkw)d9dv0d8ifszgovk9 /v, v/ m/i.i d, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is conit mpw3(18et)qlwd / nstant.

  The velocity of an object can be negatbzz )w;e h8c5n d5n0*kvq,fuwive when its acceleration is positive.

  If one object has a greater speed than a second object, the first must have -ve/gpc vm62ep +7ztva greater acceleratet g cv+zvpm6-v/ 7ep2ion.

  Two cars emerge side by side from a tunnel. Car A is travelingl + ).hg-)wm8 qn-cc e1wo)rblul/mob with a speed of $60 \; km/h$ and has an acceleration of $40 \; km/h/min$ Car B has a speed of $40 \; km/h$ and has an acceleration of $60 \; km/h/min$ . Can A will pass car B at the instant they come out of the tunnel.

  An object can be increasing in speed as its acceleraw0 regsr;q s ukad9:z4/ju+v7tion decreases.

  A baseball player hits a foul ball straight up intnk(m /f av.*5;2j bix0yuynvpo the air. It leaves the bat wb0*fumy2j;/ v.ik nv5ny (ax pith a speed of $120 \; km/h$. In the absence of air resistance, how fast will the ball be traveling when the catcher catches it?    $km/h$ (please only fill in numerical value in the blank)

  As a freely falling object speeds up, whur3s/wiig:7 rv9 ic8oat is happening to its acceleration, how doesrwi:gco /v iu79si83r it change if air friction is ignored?

  As a freely falling object;o:wskblhw ,dn( 6x o8 speeds up, what is happening to its acceleration, how does it change if air friction CAN NOT be ignoredb,wn68lh o ;kdswo( x:?

  An object that is thrown vertically upw.noks,+dcsn3 xd0 yz a7 s7ml9ard will return to its original position with the same speed as it had initially if air resistance is negln dal+ n90ozy3 sx c7s7km.,sdigible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the saewt1qee0 s ,3dme time.

  An object can have nonzero velocityyqpc3fo( 0 ej2k; hbp( and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor mak r :tsdjsvfb77a(2 (rqing no stops along thetfrsq7d s(:br7j 2 (av way has zero acceleration all the time.

  A rolling ball moves frp) g3m q kyj4ktjjet19jcc68-om $x_1=2.6 \mathrm{~cm}$ to $x_2=-5.6 \mathrm{~cm}$ during the time from $t_1=1.4 \mathrm{~s}$ to $t_2=5.2 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.1 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=3.9 \mathrm{~s}$ is at $x_2=7.9 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a qu4ch9:zkq npj m5tu27 sarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.2 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainer in a straight line, moving 108 m a wkralbtx m z:px+f; 01;hy4o1:i3qqeway in 10.7 s.b :0xi;1r eofl4qtwkx 3;h pa+y:zmq1 It then turns abruptly and gallops halfway back in 4.8 s. Calculate (a) its average speed  (数值)  $m/s$ and (b) its average velocity  (数值)  $m/s$ for the entire trip, using “away from the trainer” as the positive direction.

  A car accelerates from 73zy(jc q.yq q$11 \; m/s$ to $23 \; m/s$ in 4.8 s. What was its acceleration?  (数值)  $m/s^2$ How far did it travel in this time?  (数值)  $m$ Assume constant acceleration.

  A car slows down fromksw7m) e+yq:p7rq8:ble) l gk $21 \; m/s$ to rest in a distance of 72 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a sp+us :4mcy7 t5(bs3zrb* tk xuweed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.9 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can,/v t;rwwor5v burst out of the blocks to essentially top speed abouv rwr, 5;tvo/wt $10.9 \; m/s$ in the first 13.4 m of the race. What is the average acceleration of this sprinter?  (数值)  $m/s^2$ and how long does it take her to reach that speed?  (数值)  $s$

  A car slows down uniformly from a speed 8wg+fgv0va/z m43zw linh0 (tof $19 \; m/s$ to rest in 4.59 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m long on k tfkw9b6.kp+*80q i flxn8jl the highway. Assuming a decelq9lf0bx8+j k6pkiw.f t8n* kleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going st4iof lryey7xeh+ /l*7:5 b6qy)s g u$25 \; m/s$ on the highway. The car’s driver looks for an opportunity to pass, guessing that his car can accelerate at $1.0 \; m/s^2$. He gauges that he has to cover the 20-m length of the truck, plus 10 m clear room at the rear of the truck and 10 m more at the front of it. In the oncoming lane, he sees a car approaching, probably also traveling at $25 \; m/s$. What is the closest distance of the approaching car that he can still sately make the attempt to pass the truck? (without hitting the approaching car).    $m$

  A runner hopes to comple36v8w 0 aoocc.1d ttobte the 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go.b03ttc 8o6 ac1doowv. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$