Suppose that an objec(,l,(f)r 9ex xkoft eh6:oq nnt travels from one point in space to another. Make a comparison between the displacement and the distance tr9o)f 6tf lxq:eheo(,,n(k xnraveled.

  When is the average velocity of an obje6q87 nkn0oex6bym9 b a93rme jct equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero t4 s5 k *msls(-*jbpjcao sixty in 8 s". This is a(ssaml54 jskj- **p cb description of

  An object moving in the +x axis expern4fqmq* s6sc5 iences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x directiobfu573ri2nk ol cv 6g0n) begins to slow down as it approaches a traffic li7i klofc gbu 3rv6520nght. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow do:kz mnba8le,7m.rf i( wn as it approaches a traffic light. Make a statement concerning ia :8(.klz n7 ,mimbefrts acceleration.

  Suppose that an object is moving with a constqrmfm7lb09 pddfk5; -ant velocity. Make a statement concerning k57fm ;d f0d lmqbp-9rits acceleration.

  If the velocity of an object+vlj4* y: 3sepc6s.7 gjiw,ia ky6fv e is zero, does it mean that the acceleration is zero? Support your answer with an examplw 7l6vvjpfy6ja*c+ess4 yi:, 3 .g ekie.

  Can an object's velocity change direction when its acce1 s .;2eyv uf 1lyixeqw1)ztf8v g;m.jleration is constant? Support your answer with wym);ivx.fezvqe2y j1u.sg1 81t l f;an example.

  Suppose that an object is moving with constant acceleration. Make a u:g4gsh+fotyl2xw28eh:3 ac 4 o .x dm statement concerning its mogfotael d.g4:3 2+wom8 :hyx2uh x4cstion with respect to time.

  Can an object have incrtoj. 56(cz 9g:lc jlq fpi )/dx:8irnheasing speed while its acceleration is decreasing? Support your answer with an examp5tho9if(xjd :ngl8icp 6l )r jc: z/.qle.

  Suppose a can, after an initial kick, moves up along 6 hatnx)iwoio b/6ey 0fys/2i( ocp/ (a smooth hill of ice. Make a statement concerning its accel(oih api(ycof6/y t/0wbso e/)ix n62eration.

  Under what condition is ;)udc-ow ,4ir8qo:a zgaqg 3 w-d1r() ygfjt faverage velocity equal to the average of the object's initial and r zd 43)r:q1 afqg ,oj wo)-waut(ggf;cd-8iyfinal velocity?

  Objects A and B both start at rest.cn4 ;,md,2a+xldy3fm/ye muks 4 . env They both accelerate at the same rate. However, object A ac4ne,, myxsyv akdm3cd;nm24f.ue +/l celerates 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 accelera3yc (p9( .d zjgcn8g4 essres5te at the same rate. However, object A ecs3y nps 8jzeg9cds(gr54(.accelerates for 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 and falls in t2p)+zyf(y hk( iffor no07sl4 he absence of friction, which of the following is true of r(zkp0y47ny2lo+ hsfi)( fconcerning its motion?

  When an object is released from rest and falls in the abs o-k*g,mq-fs8k-9 n7qra-uxku jbv2q ence of friction, which of the fol ovuxfqk,ab---89kk2nq-m sq* j u g7rlowing is true concerning its motion?

  Suppose a ball is thrown straighqfbp0 6zljv*oek /(*nknr (r+t up. Make a statement about the velocity and the /l *+ (*jrenr6kbk(p von0zfq acceleration when the ball reaches the highest point.

  Suppose a ball is thri5 ndm2tu46uqy 9zu/g own straight up. What is its acceleration just before it reaches its highest py629t5 zqimung u/ 4udoint?

  Suppose a ball is thxr9p5 q,iy 1pirown straight up, reaches a maximum height, then falls to its initial height.xip,5 p 1ir9yq Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then f*(m 8dk0bsudjalls to its initial height. Make a statement about the direction of the velocity and acceleration kdb0*j8(sdm u as the ball is coming down.

  Suppose a ball is thrownm vw *er9(s+xego*k70pkp8g3 wutqk 4 downward in the absence of air resistance. Make a statement concerning its ace mx8 93kek0ut(k*q *rw7 sp4 v+pgogwceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her accelerati.c5iipr1e78u+ 4 iny do,tifdon when she she reaches termina8t 5pce i1nuof d. 47+rdyi,iil velocity?

  A ball is thrown vertically upward with a sr28kw nu3 sl6xpeed v. 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 8 6rxkl ws3n2ufirst ball?)

  Ball A is dropped from the top of a building..jdu*;bp4 sm y One second later, ball B is dropped from the same building. As time progresses, the distance bej4s. pu*m d;bytween them

  Ball A is dropped from the top of a building(0np6bxf b0+*prsf*0ij kzk f . One second later, ball B is dropped from the samkpnksf0 i*rf +j(bx600*bzp fe building. As time progresses, the difference in their speeds

  Two objects are thrown fk uzr6fibw ,.k4.cr 9vrom the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What arerr6. k ,9zc.bkiwvfu 4 their speeds when they hit the street?

  A brick is dropped from the top of a buildin-5zi ;alp:af le 10m ,(whuxddg. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistanc lua-mxd5 0:i,(pd;h eza1 flwe. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity i c xn(9iy0pgju,1s51 b3 tfpcln the +x axis. The position versus t90s,y1nuc p 3l 1fcigb5pxjt( ime graph of this object is

  An object is moving with constant non-zero accelerawt,--ma;t-w x obm(lz2ciy*htion in the +x axis. The position versyw io,t(maml-c*hbw -;-ztx 2us time graph of this object is

  An object is moving with constant non-zero velocity in thd.ku yhq/ ;htsg 3+4wae +x axis. The velocity versus t kqdu4yhsg 3h+;.ta w/ime graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. The sti 0wf* cwmcl4 o (itj/n: qb2q25k3nvelocity versus time graph of this ok obqiw*l:m0 /tn4jcstfqn 52 2cw( 3ibject is

  The slope of a position versus time grak xgqzte2-/.h vno2;hph gives

  The slope of a velocity versu.ik/p f9 l j-cy4rp;lu x6s-hps time graph gives

  The area under a curve in an acceleragcn6g;/81rw 2lli4 h7wq we,s/y jkj xtion versus time graph gives

  The area under a curve in a velocity versus wattj3*x7za r m71a*ctime graph gives

  If the position versus time graph of an object is a horizontal line, the : u6 nedqmi *,k/m4cii3)xhev object : i cieq4 )d vhi36n,mk/exm*uis

  If the position versus time graph of an object is a vertical line, th6h dmfw1i,x,* iw85bagryqn6hx73hhe object is1xhir , 7ih3fmhhwn aywbd,5 q* 66xg8

  If the velocity versus time graph of an obj98fdj6wg (u vup)b(d pect is a horizontal line, the object )uuw 86dbp(pd vj9 g(fis

  If the velocity versus time graph of ,qp( a* m1+)3t,b wh skm bpzloi*2vikan object is a straight line making an angle of 30 degrees with the time axis, the okwk*hztsvb,2biq( *imaml,o) p+3 1 pbject is

  An object moves 15.0 m north and then 11.0 m south. Find uvgw w/rm+9 s u:ad9 7/snt1bgboth the distance traveled and theb:mngs1uuv99tswar wd //g +7 magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long wj 1 md/;09bcfmnm ltu9ill it take to move 12 km upstream in fmn9m9u1dtjcb /l 0;m a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi =q(a g4 95f5qb/x zvfjj 1609 m)

  What must be your average speed in order to travel 350 km33k h2xov.pxu og 6i8u in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. What r(tw , 2(alpdvbcw56vg *lg 5xic(gtpb6gval v2x lw(5r w5, d*s the average speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 400 km3;;ak 2ay1, vfytse.7ke lgch?

  A ly (light year) is the distance that light travels in one year. Th .w/s53o qixabh4mv j5e speed of light is4xi a bm35sqovjh5w./ $3.00 \times 10^8 \; m/s$. 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 swrk9ay pu37*x0 fnli;kg4 , n-7 okpyfide for 4.0 s,y0 4 k fl kwfu*kapxr77 igo93pny,-;n how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor xnnp f4 h9 yvwl1k8i;3track (400 m), in 100 s, your average velocity ihi81;fv94 kylwxnn 3p s

  A polar bear starts x4stir3c)ww:gx,l q : u;1awz at the North Pole. 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 point. This trix tx1,w ;w:4wu z3carsl)gq:ip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 2i , koh;k-xm(l5xklua ov (p,1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting pa kv l 2 po,hu-lx,ki5(xo;(mkoint. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a wesc9pv:v tl)6a j+ vc2oekend 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 your hometos 29cv:apv j6to )+cvlwn from school?

  A motorist travels 160 km at 80 km/h an pnxl-(mbuk0 4/xa yx vb(-1omd 160 km at 100 km/h. What is the average speed of the motorimu vxy1 -b4a-/ml xn0opk(( xbst for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What i5d;kt c-0oeg ls her average speg0c -k ;lod5teed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then a 3 c7bulmp3e7at 250 mi/h north for 750 miles. What is the av l7p7ucbema3 3erage speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last* gzav;s/ :08woh(onhzl fjc1 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 theoh/f;1*g c whoz:08(zlnv asj 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 after 13 s. The car's averm c+tl,f1uwd:e8vnk9age velocity dud l8, :ctmknweu f19v+ring deceleration was 60 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to )xb m2* ls:hlk160 m/s, at the average rate of *b xh:)k2smll$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the7yuod. h::m bqy0cm8g 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 res0q vk dzi 0tstcoj+e8*7e)gc4 t and accelerates at $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

  A car travels at 15 m/s for 10 s. It then spez:*6soiis2r v0p :0ouf oul k)eds up with a constant accelerationr*6 v2ouki:fzou: )s0l s0poi of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial veloc46a7e0 he5fagst .j yeity of 3.7 m/s experiences a constant acceleration of gf a7.ae4h6ete 5ys0j$2.5 \; m/s^2$. What is the cart's displacement during the first 5.2 s of its motion?

  A bullet moving horizontally to the right (+x direction) w uc8qhhwm2nf52bv;a0d hcub )nt-ica ;,hh 82ith a speed of 207 m/s strikes a sandbag and penetrates a distance of 86.31 cm. What is thetn-u;8nchhvqh; 2amcb5 2hh28fib dc,) a0 w u average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. It reac-*fr8opw xvj*hes 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 r*jwxv -p8 of*catapult?

  A car starting from rest moves with constant 6c feh 8lja6u9acceleration 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/s to 80 m/s in a distance of 200 m. What is its avdb iem.2/uuj* erage acce2dbmueu/i . *jleration?

  An object starts from rest and undergoes uniform accel+p*p52/;vnwnb(ohbghn ysv e( a s j03eration. During the first second it travels 9.9 m. How far3pn(+ jg05b o v vhe nbsyp2(h*sawn/; will it travel during the third second?

  An object is moving in a straight line with constant acceleration. Initih (hov07 h4sc aa;n-gkally it is travelsa o(; 4hhcn7k- vga0hing at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelera34qps-djqsj y69o;g r tes 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 decelerate at1n/g l; bo-j bnli.y:m 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 atk: 6fb27amj3 dws1m q ;gro,qm the intersection starts ahead with a const o:kb7gfdrwj q6;mq13,m2ms aant 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/s on th6 z-becw t5z)xe surface of planet X where the accex z b5-)w6ctzeleration 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 speed of 12 m/s on the c,eoyf+ a6ko0surface of planet X where the acceleooa60+cfeyk ,ration 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 u eu5j-lfuc(1bpward with a speed of 15 m/s on the surface of planet X whe -ec b(fulu15jre the 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 a speed of 14 m/s on the surface of pla.cvh:.j2z 2 ry az6nxnfhv f7di8)2ronet X whernr7 6f.i:nz 2cdr)o yvhf2a8hx2z.v je the acceleration 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 frieax 8okg1sa.(suqs78su6atgn h;nl7 5as5 +c ind holds a ruler between your fingers and releases it without warning, how fnc1qa g5a +xg(l7.ks;aas8sn6o i huu s7ts 58ar can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velm w,zrrxo8zo; lz3w)3 ocity after 3.00 s?mr3owx) lzzr, ;8o3w z

  A bullet shot straight up returns to its starting point in 13 .nh i6.ui ku(:rmxplt j1 p48qs. What is the initial speed of t 1huiinkuprtp.m4: q 6 j(8.lxhe bullet?

  A ball is thrown straight up with a speed of 36.0 m/s.tpl7g6s8d 4e-/- p0fm+h cdph k pbf*f +rvs0h How long does it take to return c04 p0g msv +r+-pt/ shlbf*pek8dh6h fd-f7pto its starting point?

  A ball is thrown downward from the top of a building with an initial speed of 8 s1r3xo g9y lsm.28g bgm/s. It strikes the ground after 5.1 s. How h .g3mgs 2yolr8s b19gxigh is the building?

  A ball is thrown straight up with a speed ofj0bv quih 8y t0v.lf+ iozh9mu: p*(q. 30 m/s. (only fill in numerical value in the bfimvl:qp (qju9v * .+yb.i80zto h u0hlanks)
(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 in;hw yj6sdnoj38,l ;kqto the air with a speed of 21.4 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 8 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 8.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is thsg:xpkaqx 047d bac//e velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t = nt 5 sbk4f)l(3hcsbo8 2.5 s?

  In Fig. below, what is the jp1qjea3h1+-6 irnv lvelocity at t = 4.0 s?

  In Fig. below, what isnd3*c-w kr tj* the velocity at t = 5.5 s?

  In Fig. below, what is the average veloci/h)z:s u dq:hf,kr:fbty from 0 to 4.0 s?

  In Fig. below, what is the aver7jei3 3;os0evf xt.l lage velocity from 0 to 6.0 s?

  In Fig. below, what is the accg6p8d *3ik c4w:ghhfbeleration at 1.0 s?

  In Fig. below, what is the acceleration at 9x zmsgqd/6 m1eb,q m83.0 s?

  In Fig. below, what is t;.v:0gtg 4odsr)oe4l 6ugk puhe average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average accex ,s w )1lm;mu5uvp9xtleration from 0 to 8.0 s?

  In Fig. below, what is the displacement fromadffus- ,ufogd**gp 2 ;bf kl.-;so9r 0 to 8.0 s?

Does a car speedometer measure speect2q4z -0y tv;v3dgwji(u1 p sd, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is const aw4 u+81lx znnon8ekk; 2s,uaant.

  The velocity of an object can be negativepsl6) -f rm4nk-pt+xw when its acceleration is positive.

  If one object has a greater speedadqy7mjj i(wf(pa6u6o 67hu 5 than a second object, the first must have a gr o67i q7afwu66mdjj(u (a5ypheater acceleration.

  Two cars emerge side by side fese/nj3 0q7gy6h h6rmrom a tunnel. Car A is traveling 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 increao .4u*r b5zjrl sk*7aysing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the ae(n*nvr n-c 2cir. It leaves the bat with a speed -vcrnn2e*n(c 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 itsbxr, hgep2d*d1u ( o/*l k1oc9tgut py(h+ss3 acceleration, how does 2lk*huo(o1,rdp+h1du gst( 9g xe3/*y pcbs tit change if air friction is ignored?

  As a freely falling object speeds up, what is happening to its acceler+2af mfxv)- myation, how does it change if air friction Cxf)- 2fyam+mv AN NOT be ignored?

  An object that is thrown vertically upward will return to its origi( 4 wm3uux9h e4,voi uq1iol,dnal position with the same speed as it had initially if air resistance is negligible. If air resistance mi4q1ido 3ewvhlu4, ou ,ux9(is appreciable, how will this result be altered?

  An object can have zero velocity and nonzytx8 l+i)tl r2ero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the s1hmpnyj sg9jh 9 u8b-,ame time.

  An elevator moving from the second floor to the fifth floor making no stops ai ;carm kasjt5.,98 t m6e4 o,sk93ibqwfn1eplong the waysk , ti9sk; 8r9a. noj5q34f1a we mtcime6b,p has zero acceleration all the time.

  A rolling ball moves f(z0 5hegfhnqvyre h f9d:j7 18rom $x_1=2.0 \mathrm{~cm}$ to $x_2=-8.2 \mathrm{~cm}$ during the time from $t_1=1.0 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.5 \mathrm{~s}$ is at $x_1=2.4 \mathrm{~cm}$ and at $t_2=4.3 \mathrm{~s}$ is at $x_2=8.1 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-vq iy)6,m 6iva8x2dv-vjlo2kmile ($1 \; mile = 1609 \; m$) track in a total time of 6.3 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, mo qm8yl;c) bh.sving 114 m away in 13.4 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) ithy lsb8q;m. )cs 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 fro)klli, xh:n .*jlc )c6lb g*jlm $11 \; m/s$ to $24 \; m/s$ in 5.6 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 fromfjq7.koe ns (34ey9bu $22 \; m/s$ to rest in a distance of 58 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a sc9)kop )3g++wf i jbccpeed of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.4 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top speedl*w8lt hwi,p ; about ; hli*8 pt,lww$11.2 \; m/s$ in the first 10.9 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 from a spesr 6fubphyx3 8x(d,ncf/k *q/ed of $17 \; m/s$ to rest in 5.44 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 o1hr1y5pu *w*liyp2yjsx :t5;lcud s 1n the highway. Assuming a deceleruts5 jc puysr1*yi w2:d 1xhll 1p*;y5ation of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trr8d )h*fadir t1qx5:o9 tq h5puck going $25 \; m/s$ 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).    $m$