Suppose that an object travels from one point in space to aqdi z6)44r6msp; h rlmnother. Make a comparison between the displacement and the distance tm li66 rdm44sqp;zr)h raveled.

  When is the average velocity of an o7ke9f dph 9q2jbject equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "k5a g06n pa*iffrom zero to sixty in 8 s". This is a descripp*5gania06 fktion of

  An object moving in the6hfh7 qbq)zag38 w*j p96u xu e*sdcb; +x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car t */zucp h((tc/ke ndzwf b(k2v7;zw -qraveling to the East (+x direction) begins to slow down as it approachek2cv7z *(;(e(dnf-cb uww/zkq phz/ ts a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) beqv+, d p9j:jmxd,s:q s e/4zungins to slow down as it approaches a traffic light. Make a statement concerning its ,ujs+s:j:v4qm,xed 9q zpd/nacceleration.

  Suppose that an object is moving with a constant velocity. Make a sti lzmcct9 a9*6atement concerning its aca6cimc9z tl* 9celeration.

  If the velocity of an object is zero, does it mean that 7dv8kvbsp +p994t cfkthe acceleration is zero? Support your answesv 9t978 df 4kk+bpcpvr with an example.

  Can an object's velocity changq/wscjl(z2w 0 e direction when its acceleration is constant? Support yours lwcw q2/zj(0 answer with an example.

  Suppose that an object is mpvf k+bzyb o8ag.d hh;g04:8 yoving with constant acceleration. Make a statement concerg8yb+dfhb 4v.z;:yg hap ok80 ning its motion with respect to time.

  Can an object have increasing speed iw 7 4pj;c n8q:)vnjlxwhile its acceleration is decreasing? Support yourc;i)7 qjxpvjn4 w8l: n answer with an example.

  Suppose a can, after an initial 5;mbxmexc15f bog ; w/3flkz :kick, moves up along a smooth hill of ice. Make a statement 3 m; g5oxb m;zc1xbkw5flf :/econcerning its acceleration.

  Under what condition is average v(cf) a 1oj1fujelocity equal to the average of the object's initial and final vec1f()u ofajj1 locity?

  Objects A and B both start at rest. They both accelerate at p:unecctykyn61so 1, 3a)nl l;xt i+.the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A comparep 1, txl aykiuncn cley.6:s;n)o1+t3d to that of object B?

  Objects A and B both start from rest. They both accelerate at the same -w sdl +7jraf7rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to tha +-lr7dfsjw7 at of object B?

  When an object is released from rest q)foc8x klw. .and falls in the absence of friction, which of the following is true conc.xlo)f8cw. qkerning its motion?

  When an object is released fk)bx *c+wqe )xrom rest and falls in the absence of friction, which of the following is true coq)b+*ew c xx)kncerning its motion?

  Suppose a ball is thryj5 0c1)s87gfvpddj lown straight up. Make a statement about the velocity and the acceleration when the ball 5l)fydj c1d8pjs 70g vreaches the highest point.

  Suppose a ball is thrown straightwb 3(m tpy y54bbrr5 wfh+.oy.6w x6fx up. What is its acceleration just before it reaches its highest x5op6(yfyf 6xw .h.+ t5mybw 4w r3brbpoint?

  Suppose a ball is thrown straight up, reaches a maximum height, then fallb ,qixg x;*9u,, f mzlrq,:xpps to its initial height. Make a statement about the direction of the velocity and acceleration as thprfq bmg,x:,zp* ;,x xu,ql9ie ball is going up.

  A ball is thrown straight up,bacud 1pb xj e d,,86,u4agfi( reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as theib6auujd(pb4cafg ,, 8,dex1 ball is coming down.

  Suppose a ball is thrown downward in the absence of aij.ne*)ybc2v ir resistance. Make a statement concerning its accncj)2.i eyvb*eleration.

  Suppose a skydiver jumps hcmh3pcyjvq99 /zy .2from a high-flying plane. What is her acceleration when she v m9.y2pzq39jycch/hshe reaches terminal velocity?

  A ball is thrown vertically upward with - 4ms-q l,kums:6 pftaa speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). Whkm4,atufls:-m q- p s6at 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?)

  Ball A is dropped from the t+hf +fswgc8(f7;w c(ou psiixnl (u:0op of a building. One second later, ball B is dropped from the same building. As time progresses, thf wo8: 07;+f+ic(il hxsucp (nsw(ufge distance between them

  Ball A is dropped from the to1mm8e vcc lh:hgpguqo r0ni ***;:no6pbls +5p of a building. One second later, ball B is dropped from the same building. As time prog0ho gn v: ucq58ep*m gs:*lbh*m;+iol 6rpcn1 resses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is throg k97 qsa:zer6wn up, and the other is 9eqzk6g: 7sa rthrown down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thrown strama ryeh3r;5;:bdx. auight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of t;:ada rumrex.h;3by5 he two bricks.

  An object is moving with constant non-j)q,)/m 6idr2o)adv) wx hshhzero velocity in the +x axis. The position)wdqrv xj)d/)2 aos)i h6,hhm versus time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. yz*qw2hp(4potn6-yp The position versus time graph of ty hynp2o4zpwp6q t*( -his object is

  An object is moving with cot ( gzlf56r(-wg d)j:fmndw+ibs2w4g nstant non-zero velocity in the +x axis. The velocity versus timelg drz4-g b wwf5 6dt ms2:jwnf)((+gi graph of this object is

  An object is moving with constant non-zero acceleration in the +tdj;qea .it i;mhrl,plbhp;(rz (+; 5x axis. The velocity versus time graph of h5mr ;ejbzrl,p;ihli;( (qtt da; +p. this object is

  The slope of a position versu+ gn:ar s+bdt9.0xobn s time graph gives

  The slope of a velocity versus tc ekd- e-oec 6i; 1.rmh/zr)eaime graph gives

  The area under a curve in eas :r5sxhl;oa -44j ean acceleration versus time graph gives

  The area under a curve in a velocit1,+h j x2fruuty versus time graph gives

  If the position versus *py(a qitq 9t7h,m rj-time graph of an object is a horizontal line, the object 7itj hyt9r-mq a*,pq(is

  If the position versus time graph of an object +9m1onc3 g lm/u oae-ais a vertical line, the object isu/+omg 3e- a9m ac1nol

  If the velocity versus time graph of an object is a horizontal line, the object 8m fes/baw:h13h+xsie :+isfbh/m1xaw8 3hsis

  If the velocity versus time graphko,( )kq p4,z.se) kmr jgi*nh of an object is a straight line making an angle of 30 degrees witzg .es)i4k pq*h ,( k,korn)jmh the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find bot( kbe-- (,ynx 8x92 j(lbxjwenvuvka, h the distance traveled and the magnitude of the displacem-b kj(8 nb,9xjlxx(en,ak( 2wu-ve yvent vector.

  A boat can move at 30 km/h in still watex8fow,g4s nd w qae90*r. How long will it take to move 12 km upstream in a riverfo *0,d4qanxs9 eww8g flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 ;.6 dpkukhd;ami = 1609 m)

  What must be your average 9l2h h2x hy+hx1t:ggw: pgfi+ speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 1ea(:fb d.zx fhours and 57 min. What is the average speed of the runne(efab1fz:d. x r in m/s?

  A car travels 90 km/h. How long does it take for it to travel 400h7k2gms:1 vf3iy*hbcb es7 x* km?

  A ly (light year) is the distance that light6:av gw wrhq+9b5pi8k travels in one year. The speed of lb rg 56qwwip:+h98vak ight 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 alob s gwn71ek57z5lnfem -7;bfeng a straight road and you look to the side for 4.0 s, how far do you travel duri bf 7en zesg;wk7bm5-7nefl15ng this inattentive period?

  If you run a complete loop aroundcsi;vk ib9dt; 8 n:mp6 an outdoor track (400 m), in 100 s, your average 6bsk: i;inv;c9p mt8d velocity is

  A polar bear starts at the North Pole. It travels 1.0 (46v 1jzmjnc9 fldh1d 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 bear's a91v1ljnjd(4mdc6 zf hverage speed?

  A polar bear starts at the North Pole. It travels wktzst y/h9o *71dj5ly /cx+kh g56 wc1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to ret k l5 jyg 7dtx+c*kz/9cwhosw15/t6yh urn to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from scho 3 ;hhvi p+ (cjtt;uckoc07e4gol 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 hometown froociv(3 p; cuc4jg 07t+tk;hh em school?

  A motorist travels 160 km at 80 km/hs:to o+tu8 5uaj. l.xmtv(i x- and 160 km at 100 km/h. What is the average speed of the motorist for this u(x x8toia.t:u-m olv tsj+.5trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h a ps51u(6vz.. -pqsb wqr:okkjt 100 km/h. What is her average speed for the trikv p-(rzsq65:.w ukpj1o sb.qp?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north for 93tmy m( e8d q9juq-mk750 mijm ek3ud(tmyqm-9 q9 8les. What is the average speed for the trip?

  In a 400-m relay race the anchz 1*k:yppz.px ny7ku 6orman (the person who 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 7ukn 6zp.:x1 yppyk*zthe team A runner starts the final leg of the race, in order that the team A runner not lose the race?

  A car decelerates unifor3,:h rsp* nztvmly and comes to a stop after 13 s. The car's average velocity during deceleration was 54 km/h. What was th*r t:,vpnz 3she car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at tb2j83kn3 *m:yt ttue qo:)crghe average rate of *g8qt3 :t: k jrm3bneut y)2co$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 kmu/5o)jojs p5 c/h accelerates 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 ad+vlrrt5y73+7fjckd12vjt ck(e+uma+ ; mf v ccelerates 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 speeds up ; x57,u) ,vc 6wzc6b ymck-bdrduq (plwith a constant acceleration mz-drbw),qv66;ldycb u ,xup c5 ck7(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 pshm/j+ 8(vq7g c zi2zof 7.9 m/s experiences a constant acceleration of (hpz7 z+c2jm/qi 8sgv$1.5 \; m/s^2$. What is the cart's displacement during the first 4.9 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed o5(z; 9j tqvflgf 406 m/s strikes a sandbag and penetrates a distance of 55.47 cm. What is the average accelerationf lt 5(jqzvg9;, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. It reuehv8z5 )piq,cz7x )l ocre7 8*sfc* aaches 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 leng c r*h7uv* fxazcil7q)es )p 5c8zoe,8th of the catapult?

  A car starting from rest moves with constant acceleratio. v*pmpou+/cwte 2kvj+0 aw.bn 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. 2hak z69sau )dWhat is its average accelkzsaa 26)d h9ueration?

  An object starts from rest and under;gseh alhul: 64x1e2xgoes uniform acceleration. During the first secxs1eha4 lgl;ex h:26u ond it travels 1.8 m. How far will it travel during the third second?

  An object is moving in a straight +) ch un0sv5udhm1i0bline with 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 dh bnh+u5u1sm)c0 i0vd uring this time?

  A car starts from rest and accelerates uw81n/gv;yx o,w. ee 5 lcfq5klniformly 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 roav:3) h /vpdote3h) mxhg)aa t, ds0+cdd 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?    $s$ (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 b*xt n 1hvtz:9heen waiting at the intersection starts ahead with a constazhtnhvt:1 x9* nt 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 wityprd47o 1n5 6 3( e;,r9*fcbdmuumxg kbqazd2h a speed of 12 m/s on the surface of planet X where the acceleratio 1dz65 ap; b4 7kxm2 bd ucm*uqr9ygno3fe,rd(n 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 suvueb4/+8v n/1vg(y.lq d yatpeed of 12 m/s on the surface of planet X where g14ub+av/unq yt d8.(vel vy/ the acceleration 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 upward with z, f;z 6d m4olpjufcv;*p0q..yub:2jwget 9j a speed of 15 m/s on the surface of planet X where the9o6t qpb*0:gdzf ,y;u ;uejw.fvc l.m 2z4j pj 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 planepo/-m r ,f2alht X where the acceleration due to gravity , /ropf2 -lamhis $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10 s8a; d9bpx3/s uy8 nubu. If your friend holds a ruler between your fingers and releases it without warnin8 da n upybx;9ub/83usg, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward ap(mvy m;ol 88i 0 tmf ndwwwx3*l41.gat a velocity of 19.6 m/s. What is its velocity after 3.00 s*lg(8d0pm3;oi.y l 1w mfnatvmw8w4x ?

  A bullet shot straight up returns to its starting point in 16 s. ;mg -b- gl3phl What is the initial speed of the bullet?p3m;ll g --gbh

  A ball is thrown straight up wji ncy/ /tz/epm*w9 q6s ph8ix1/qty 3ith a speed of 36.0 m/s. How long does it take to return to its snhqt91z ms ci8t/y*ip j qx/6/ ye3wp/tarting point?

  A ball is thrown downward from theb ,dow+frv jj-c8:owzom; r3o48 h8lk top of a building with an initial speed of 12 m/s. :- cb lo8kjmww;,4o z8 joh+83frrovdIt strikes the ground after 5.5 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in nu,s )6j5c0 ldckqdiut :,ooj e5merical value in thu5oiq:j5c t 0djs e)ld6 o,k,ce blanks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

  A foul ball is hit straight up into the air with 8g +m2pyuri3ie2k *uwa speed of 24.2 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 10 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 10.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity 1h-;k :.ao fnrqhirz8 at t = 1.0 s?

  In Fig. below, what is the veloci(zj0q ,xxt d/zphd4p1ty at t = 2.5 s?

  In Fig. below, what is the veumoqmegsb)( koc5k4+iy/ d(-w49q f llocity at t = 4.0 s?

  In Fig. below, what is the vzl:aok+-q e qh1fk).x elocity at t = 5.5 s?

  In Fig. below, what is the average vefzc+8j+ 4p h:zb nor8xna2-tilocity from 0 to 4.0 s?

  In Fig. below, what is the agur 6+fq5ws-vq6gdv.v k yg)( verage velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleri1)dddbl-p,+s;smrtn y fbk uk nspw3 ;*.+3y ation at 1.0 s?

  In Fig. below, what is the acceleration at 9,xlf guuh2ugz( pj((3.0 s?

  In Fig. below, what is the average accel2lm2rxsr6d glxj rs t iwt.v6-s:r2+) eration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration zz:0j5vp n9fg from 0 to 8.0 s?

  In Fig. below, what is the displacement -:3z i *a;aft*pw1lx r-luelhfrom 0 to 8.0 s?

Does a car speedometer measure speedo,th.p diwa-ge25l +r : jz7vx, velocity? {speed|velocity}

  An object can have a v3f* wae 3s,eq bkuo -8jyoxg8*arying speed if its velocity is constant.

  The velocity of an object can be negative when i-y*d;-f tlk w6afr44nl3 4asjb4gm n pts acceleration is positive.

  If one object has a greater speed than a second object, the first must have a gr fgxcxktf; u 851 *gx(iv/cd7xeater acce/1 xx 7g gd 5x;ift8fcxv(*kucleration.

  Two cars emerge side by side from a tunnel. Car Aq( 60duuz,t0wo7hln z 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 increasing in speed as ijt, iw+j;k :auecy9x )ts acceleration decreases.

  A baseball player hits a foul ball straight yw3)hj7c- e1 xl;um9pte x) 3hzkfx9jup into the air. It leaves the bat with a speed ofmekhcfp; 3 e-7)jzwy jxh)l9ut3xx 91 $120 \; km/h$. 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 speew90/ 7pxw.9beg - phi2o9 9doafrhmsrds up, what is happening to its acceleration, how does it changepxf di2hrwsh/ 99a pg er0 9oobw-.7m9 if air friction is ignored?

  As a freely falling object speeds up, what is happening to jezgd9o o/u/.9x+ vhhx6kjkud*: 4uzits acceleration, how d vhk.+zko /9 uh/d4ue 9z:x6o*dgxujj oes it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upl8smmr2vd9p5. . ovjre+ed5k ward will return to its original position with the same speed as it had d95ek +.v.o2pv l m de8m5srrjinitially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity cetcn jf138 +:k o/xv/8ptjd:hgf y 0oand nonzero acceleration at the same time.

  An object can have nonzero velocity anzky+t7(z-fbjx1hkwth c4 *4 od zero acceleration at the same time.

  An elevator moving frofm ,p yh1*-h-;lkfn rym the second floor to the fifth floor making no stops along the way has zero acceler-;*mf hh-ypnr kl 1f,yation all the time.

  A rolling ball moves fromrj7lww/c0e g 3 $x_1=2.9 \mathrm{~cm}$ to $x_2=-7.5 \mathrm{~cm}$ during the time from $t_1=2.4 \mathrm{~s}$ to $t_2=5.6 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.3 \mathrm{~s}$ is at $x_1=2.0 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ is at $x_2=7.6 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter- clk . prpv0o(x./-iaumile ($1 \; mile = 1609 \; m$) track in a total time of 11.9 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainer y byeqsq3w d/53+ -xa2hu6u,vf e9 eurin a straight line, moving 114 m away in 10.1 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculaufqe 9rq aexy3dsuu5ehy-6w3bv/2+ ,te (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 fr4pj.8 b(lc-ucdcntr t7 tk1o)om $12 \; m/s$ to $22 \; m/s$ in 5.0 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 fromg7yjvjl-4tz/gl 3a/ s $18 \; m/s$ to rest in a distance of 74 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must rehb ) qkwgfz4/-ach a speed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $3.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially to+qjtr,16nsm qp speed about qq rs+j61mn, t$11.1 \; m/s$ in the first 13.9 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 uniform g bj4h2,r1ycoucws 7 7kkqkl4-)y/i jly from a speed of $17 \; m/s$ to rest in 5.25 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. As)bk. fe e** ywvuucx 7i15f5k0*vvhp p 4mil-ysuming a deceleration ok)*4e0 *y evbx h.yc*mi-51pwv5 i7 fvpu lkuff $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trzot9- 5rdo 5dd ey-j*luck 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).    $m$

  A runner hopes to complete the8h i b0vuyh:*x5kxp6c /-dn pc 10,000-m run in less than 30.0 min. After exactly 27.0 min:k/hvu5 i6 hxpy0n8dbc-*xpc , there are still 1100 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?    $s$