Suppose that an object travels fromojqln8ddlf . 26w5(kx one point in space to another. Make a comparison between the displacement and the distance travelej2 xdd qk8w.5(6l lnfod.

  When is the average velocity of an ol./ i,4 o0nhv /hfel y2yq/iiwbject equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from n d*g*/an y dz xl0)0zr;fftg19snu7szero to sixty in 8 s". This lay*s)n /u09 z d sfr0zgdnfngx;71t*is a description of

  An object moving in the +x axis experiences an accelerat +sfv: qzemz :q/)bz)cion of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow doys*vjowe 9-n. wn as it approaches a tr vonw9-.jey*s affic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to sloxow;eeftt ;f n b o8j3:i6i 0bv*dyk/0w down as it approaches a traffic light. Make a statementj0xn 8do6:;v0iw3f ibte/*kf; eyob t concerning its acceleration.

  Suppose that an object iyddmt be3c//drl s,+ /7ce1mp( d6duos moving with a constant velocity. Make a statement concerning itsyec7 dddmrd/,/1 c ( d+bme6to/ lup3s acceleration.

  If the velocity of an object is zero, does it mean that the accel/2zie)w ve( a8rus7lx eration is zero? Support yalz8 2/reuvxei)7(swour answer with an example.

  Can an object's velocity change direction when its acceleratjov2g(fg-5vdv hi0 6l ion is constant? Support your a lv(gf2v -d6io0vj5hgnswer with an example.

  Suppose that an object is moving 5i2 mslo1; cpxwith constant acceleration. Make a statement concerning its motio2 pl;15x ciosmn with respect to time.

  Can an object have increasing speed while its accel:n3p -1al5zjticu 4x z8sey. keration is decreasing? Support your answer wit3e at :p us-4ylc.8znj5zk1xi h an example.

  Suppose a can, after an initial kic5r j 2bxih*iqbcn3j(7 k, moves up along a smooth hill of ice. Make a statement concerning its accnci b(jxji5b *372h rqeleration.

  Under what condition is average velocitdq7; qmeace+ m6i5kn/ (6fa ewy equal to the average of the object's initial and final velocitiqnqecmea;(a5/ e 67 kdm6+wfy?

  Objects A and B both start at rest. They both accelerate ,0u p1o/ v8nfm2atb uzat the same rate. However, object A accelerates for twice the time as object B. What is the final speed of obje 8vo ban,m2 1utfpz/u0ct A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at th 996ib/hcvgs aoz)3 :v bcs2ehe same rate. However, object A accelerates foz2)/o :igch bcvh6s 9beav9s3r twice the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest ak ieh0:y)fyq) nd falls in the absence of friction, which of the following is true concerning its mo qe)ik:)0fyh ytion?

  When an object is released from rest andt7r vjrv28n (b falls in the absence of friction, which of th27nrvbjtr (v 8e following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity and ce+pj1f(sg(v u)r:ydthe acceleration when the ball reaches + vufgs(d y:)rc(pje1 the highest point.

  Suppose a ball is thrown straight up. What is its acceleration joa cul6y/ 3 )zjeu52+icb ;b e7gtejv5ust before it reachea7 e tu2eob;ie53lcv)+b/j 56zujg y cs its highest point?

  Suppose a ball is thrown straight ui hi+muc+ja*(78t8 b8atpx0sj (udb fp, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity fbat*i(0 xajd ju8ms tbuph87++i 8 c(and acceleration as the ball is going up.

  A ball is thrown straight up,oamvnofb(i ml9 7w5pt j8-4;c reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is comilo jf 9(v7n4m8b;wtamop5-ci ng down.

  Suppose a ball is thrown downward in the absence of a:sq,g o; mfpoh v/c iu6e;p7+gir resistance. Make a statement concerning its accelerap o+eo gu,m:hqvfs;pgi6c;/7tion.

  Suppose a skydiver jumps from a high-flying plane. What is her ac9rq( 7:myv ykjm:y+opcnxx +g .(p kc4celeration when she she reaches texkoqxk yp :n(j+ 9(m:4cmcrgyv7p.+ yrminal velocity?

  A ball is thrown vertically upward with a speed v. A +zn,(qgsm0tp(hzd 6mn 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 tq 0dzgtpn,(mz+m6 (shhe second ball go than the first ball?)

  Ball A is dropped from the top of a bu0lf lx 7iyof35ilding. One second later, ball B is dropped from the same building. As time progre5olxy 70lff3i sses, the distance between them

  Ball A is dropped from the to)sh g y9wj:6j b f(c(fg9ezm3cp of a building. One second later, ball B is dropped from the saj9w fbz h:s3(cmfgye6c)j(9gme building. As time progresses, the difference in their speeds

  Two objects are thrown fro7wid 4yzj/vsb;o.:hsuq yd. * m the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when t viyds;ow7b * :h/j.uys d.4qzhey hit the street?

  A brick is dropped fr( e9bj zos872tv(r hhvom the top of a building. A second brick is thrown straight down from the sam (jv2o7 e (hzt8h9vbrse 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 velocity in thepmfc wp2kzcf-4w24 ovkag-lh: (; oo1 +x axis. The position versus time graph of this object ohz cp2v;w1wo gc-- 4fa(o:mfpkk 24lis

  An object is moving with constant non-zero accelerationth) gq4 hgtoh)j,8 i e9:j8ebo in the +x axis. The position versus time graphh88oij)9e)h:eg , j4qhotg tb of this object is

  An object is moving with con5ch ;.:n kfneb ;c5sjk( dvbyl,k+)sistant non-zero velocity in the +x axis. The velocity versus time graph of this object n bikk.(es;b)ykf;nvd:lch 5 c+j5s, is

  An object is moving with constant nocwvyz4-tzp+ aq: -;mc*lb4fmn-zero acceleration in the +x axis. The velocity versus time graph of this ycpvb tl f+m -:44w *mz;zcq-aobject is

  The slope of a positip4 :e i/1 l1g6mjb sc9tfwsir7on versus time graph gives

  The slope of a velocity versus time graph ayely3p3:.f dqbj* v:g0sp s: gives

  The area under a curve in an acceleration versus timexkb/pbr-(tx4mp9,y xb + 6rzg graph gives

  The area under a curve in a velocity vqv .vx/x e/s1yersus time graph gives

  If the position versus tipkaz k0,fuqj+z jc dv.i5 o,( ;w,.0pd 7ivjkgme graph of an object is a horizontal line, the object ispd,jkc5.guwzavk dz,+iq kp0 7i(o, .fj 0v ;j

  If the position versbwutl324 e cy6bg z/m c1dy*( df3slh/us time graph of an object is a vertical line, the object iss d h33/(lydz2 1clf6egc y4b u*/mbtw

  If the velocity versus time graph of an object rw t7l+r-ywros/bzpm7r +::2 f9r ltlis a horizontal line, the object 7wlt tpy2zbs7 -rlrr +9:mf o+ rwr/l:is

  If the velocity versus time graph of an object is a s 1no :qlrn*( zf0sfjm ay5/s8jtraight line making an angle of 30 degrees with the tiy1f5q0 s z8/ fjrls*oj(annm:me axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both th.w0nf0fuxy j (e distance traveled and the magnitude of the displacement vect.0n0fy wj(xfu or.

  A boat can move at 30 km/h in still water. 6hqj;/le40b1 b txe t/vi4kgib9b9ypHow long will it take to move 12 km upst tiv4/y/j0 ebp9 k6hl qe tbx1i49bgb;ream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 160aj 3i) j /dlpmpoe8ugrt6p39 ;9 m)

  What must be your average speed whd o*2l163ehzw5/apno ic) m in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 mx.x1kqg+cw psd7 c1j7+ ec *uiin. What is the average speed of the runner in m/s?+c7qipec s* +d.wj xc1kx7u1g

  A car travels 90 km/h. How long does it take for it to travelhf,s 3s0 s-zjr 400 km?

  A ly (light year) is the distance that light travels in one year. The speedqm/ gmw h4i2q,e0gr.b of lightgw meqi rhmg024,b.q/ is $3.00 \times 10^8 \; m/s$. 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 side p h8hudi-b0z9j2kdyg )j 6 i-tfor 4.0 s, how far do you travel during this ina- 0 i9hkgd2t6bp)jzjih8- uydttentive period?

  If you run a complete loop around an outdoor ;muk7v vv/kz).pavr9 track (400 m), in 100 s, your average velok) v9k/mv7.u vpzvar;city is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 kle r5 ,jshy2 j3fr*6lom east, then 1.0 km north, then 1.0 km weshros,fr5 jy 26lj*3 elt 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. It travels 1.0 km south, then )hh e zdec3o181.0 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 )hhe3dz 18oe cbear's average velocity?

  You are driving home on a week4e,q i kxzxc m5u3c:v*el5:t7l 4 pq av;oj7mqend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is you,:lt4kcl7;c 7ixqevo*p5vmx43 a z 5:q ume qjr hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 1re-x- pwbf.3z 00 km/h. What is the average speed of the mo3bp -.ez xw-frtorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What ielb08fzleli b1lev :l3 1i6w- s her average speed for the t 0e63 1- wfieellvl 8l:1izlbbrip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h n( b 1;m+tm7:lvcgl ulw8rmmt.orth for 750 miles. What is the average speed for ttm7 :1v8trlg.(w cu lmbl m;+mhe trip?

  In a 400-m relay race the anchorman (the person who runs the last 100x4 d)w gst6d pi6tn:2p 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 the race, in order that the team A ) isp:txpg2t ndd64w 6runner not lose the race?

  A car decelerates uniformly and comes to a stop after 13 s. The car's average 5m+*6cr; ujo w7 musmwvelocity during deceleration was 37 km/h. What was the car's deceleras+*ucmr m7omjuw6w ; 5tion while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s v,+fq tr.rj5pt /at.s8qh wtw2 vd3k5, at the average rate of kw. ,s 5rpj vq8f t.2ta/5wr+3hdtvtq$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelazqmy/ ,j *wgyq +g ak.+e2cg5erates 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 accelei9td**;: piwm tont 8erates 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 then sp-ej 6 7glm9.snz8xsmieeds up with a constant acceleratioi-67s8ngm9sjlx em . zn of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 4.4 m/s experiences a c / ado.2wqj.neonstant acceleration o wdqo.a2ejn. /f $4.5 \; m/s^2$. What is the cart's displacement during the first 9.5 s of its motion?

  A bullet moving horizontally to th7q1t n ddanpgt kv;j,s/e-):d)q1mspe right (+x direction) with a speed of 405 m/s strikes a )vssq,e-) pda qkd;1 npgtm71:t/jdnsandbag and penetrates a distance of 87.71 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. It rz9 ,xq.z4r*5en ik )ph,z dpaz q1fkfin*5 k.ceaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the ka.qc15q kf*rx epipn 9h4 fzk,znzz 5*),i.dcatapult?

  A car starting from rest moves with constant acc: ii-dar69mht v1m ou.eleration 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?

  A car goes from 40 m/+wld/xp8m6qiaq k 6 5zs to 80 m/s in a distance of 200 m. What is its average accexwq6m+6d i5 /lzakq 8pleration?

  An object starts from rest and undergoes uniform acce x8krm; 33 1t.gwnm ad2)gjg:t aqg/releration. During the first sec8ke2gg3r nj tgr/gm3d ;t w qxaa:.)m1ond it travels 2.1 m. How far will it travel during the third second?

  An object is moving in a straight line with constant acceleration. Intck8l8 q2wk :xitially it is traveling at 16 m/s. Three seconds later it is traq2 w:88lkxckt veling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates :gsuwncmdz1w/18 v4f 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?

  A car with good tires on a dry road can decelera3xtt p+)smqoz:v a 5t*f.s(syte 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?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ ((only input numerical values)

  At the instant a traffic light turns gre hjkyw(92;yq6h, yte een, a car that has been waiting at the intersection starts ahead with a constant y, ye;629 weyhhqtjk (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.    $s$ (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 upward with a speed of 12 m/ gkyrn41xly7- s on the surface of planet X where the accelerationx7ryl-ng yk4 1 due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward w4o 95 uim6dodiith a speed of 12 m/s on the surface of planet X where the acceleration due to gravity 5 idu9iomod 46is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upward withzbyvf0w:n5v a) /y ,tq a speed of 15 m/s on the surface of planet X where the acceleration due to gravit f, a5zty:vyb/wqvn) 0y 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 upwatlwht cwx3; 27q sv0y+rd with a speed of 14 m/s on the surface of planet X where the acceleration due to gravit t+ xqy vwlc3wth20;7sy is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.102pndsx t :z 3dfvojaz(lf21 o7ea/r 52 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall beforz trojpvo5ffna7e: 2xs 2zd21a/dl 3(e you catch it?

  A ball is thrown upwar7i e049 jhpsjjohns :tbp:q2/d at a velocity of 19.6 m/s. What is its velocity after 3.0::p pt4hhi79sjonj sj2q 0/be0 s?

  A bullet shot straight up retizz n qcgx59-epq5+n0urns to its starting point in 6 s. What is the initial speed of the bullet 0qq5g +-5p9iczn xezn?

  A ball is thrown straight up with a speed of 36.0 m/s. How lo90g7fqko 9:ippt i97banx, hyng does it take to return to its sg9fx t ,qoabii07 :yp9nkh7p9tarting point?

  A ball is thrown downward from the top of a buildingclxv 4,d 0 y j*qd80.h+4mbiw hzg7tes with an initial speed of 14 m/s. It strikes the ground after 4.2 s. * 08xw+lci.dvhey4,jm4qb7 td0 zhgs How high is the building?

  A ball is thrown straight 7u11-f8 wz1qbp7mtidr bqe6i up with a speed of 30 m/s. (only fill in numerical value in the blanks)mpzf711 wq1 b8 drt6 7u-ebiqi
(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 up into the air with a s-gx : 67xo.m7xuucnp axrv+fqu j( 56lpeed of 28.2 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 2 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 7 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 7.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is tc cf4y2ud+ a,zhe velocity at t = 1.0 s?

  In Fig. below, what is the vwgaf -xlv)5n* elocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 7 orc,g9aa 3xf2n p5bbb1)nzhs?

  In Fig. below, what is the velocity at t =r 65kw9u .nz,tzkvffak) 8v x; 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 s,0 tuh6xl-9k hkv) 8zq iy/(m3we ygcr?

  In Fig. below, what is the average vel 4miy7 +xa(evoocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at. bqd1q1w ybgrv(f+p1sg7/e f 1.0 s?

  In Fig. below, what is the acceleration at 3.0 s?9 xelu3lwo2.t

  In Fig. below, what is the average acceleh;yc8q/ edax;y;ka *t ration from 0 to 5.0 s?

  In Fig. below, what is the average acceleratioa*ih-tnr cc1y6c s; r/n from 0 to 8.0 s?

  In Fig. below, what is the displacem5 dp4 -(c8owrg+u5wdnt wbcc0ent from 0 to 8.0 s?

Does a car speedometer measur:q7b ea-f4o cueyzc i;,vr30 pe8j.em e speed, velocity? {speed|velocity}

  An object can have a varying speed if its veloh di9)kois64(vy c xsp02d(yycity is constant.

  The velocity of an object canyo: r)tg f0j;j be negative when its acceleration is positive.

  If one object has a greater speed than a sej f0z t5.1h0a s 8y khuez:ivl6l)w2v ,r,ldwpcond object, the first must have a gre 0 .uwr)2i1 ,:l l hvz60yasdzetf vkp,jh58lwater acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a spy/z1lhhq54 f ceed 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 increasr/ 47xf/n4 uhm jp5 yso*eep3sing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into tb6hda 1gua; i9he air. It leaves the bat with a speedh6gib ;d19 aau 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, what is happening to its rsecrk,9bzf * ,-igo-bs (:szacceleration, how does it chan -e-,sg: brs,9rfzc kozb s*(ige if air friction is ignored?

  As a freely falling object speeds up, what is happening to its a:w5 a1qjor;-wdt7b c fcceleration, how does it changww1rob :d-jct75 aqf; e if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original position *wb2b,fgu9j0a m 4zmcm ,fm 2awbgzb4 9cju*0with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at theyolt (k5 x*hs* same time.

  An object can have nonzero velocity and zero ac7ux,uk82 *)s lm bfimgceleration at the same time.

  An elevator moving from the second floor to the fifth)qhsx00 5 dmjz floor making no stops along the way has zex5m qjds0h)z0 ro acceleration all the time.

  A rolling ball moves fra cn1s j*)s *0oy70p5r1ufr-jak mrkn om $x_1=3.3 \mathrm{~cm}$ to $x_2=-6.6 \mathrm{~cm}$ during the time from $t_1=0.8 \mathrm{~s}$ to $t_2=5.7 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.5 \mathrm{~s}$ is at $x_1=3.0 \mathrm{~cm}$ and at $t_2=4.5 \mathrm{~s}$ is at $x_2=7.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete lq/ d1*h gzt cfly*/hn;aps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.5 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, movi23eh ) *oipc74el yquv3w,exxng 99 m away in 10.0 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) its average x ul*2 xyie hvqp3 e)3wceo,74speed  (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 frc ih.yp 2q7g:aom $13 \; m/s$ to $24 \; m/s$ in 4.4 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 from rcn. m6,bob vz7w4z 0q$19 \; m/s$ to rest in a distance of 67 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reachn;su87zxn eo,yrvti 0 g 00u+p a speed of $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top speed abo;m5wpb58* xp*i(lj d6jyzumwut 5m pz; ( jmb*i*6pjxlwy8u wd5$11.4 \; m/s$ in the first 11.9 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 from7p dfj*etq0;li(uz q0kpw( p i-b7z2 o a speed of $17 \; m/s$ to rest in 5.32 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 the highway,xb;fz/e mrm. . Assuming a deceleraemm z/;.rx,f btion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going a rbmv)6i5hmmf)6x .g$25 \; m/s$ 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 complete the 10,000-m run in less than xcaqbmo, n*7+ 8xcw29s u j5ke30.0 min. After exactly 27.0 min, there are still 1100xxb u95 nsm+8ccoj2,ea 7*kwq m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$