Suppose that an object travels from one point in space to ano0wgx t7qo+e rscxizk /zk ):;;ther. Make a comparison between the displacement;gqi:0+zos trwzk x;cx/e7 )k and the distance traveled.

  When is the average velocitycak5w1 w.erumy7k1,t8rf 9i/u ob h2f of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car ca.2un)in ystapq c +,pd: 1n+utn go "from zero to sixty in 8 s". Thisq+up.,n:ipn s c 1a2+)dutn ty is a description of

  An object moving in the +x axis experiencb 2kt)g5egdy ;m( u(xces an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x y)kfves.w /*w direction) begins to slow down as it approaw vwe*yk.s) /fches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car trl +.doq:tqe; pif(5i uaveling to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its accelerat t+qqd;lo5:ifep( .u iion.

  Suppose that an object is mojci4+. udg;jq ving with a constant velocity. Make a statement concerning its ac;ji+ cdju4g q.celeration.

  If the velocity of an object is zero, do8de a+fm;yl 02 s6bmoles it mean that the acceleration is zero? Support your answer withm 6e;o8mdl2sb0af yl+ an example.

  Can an object's velocity change direction wh as/ pm;r +85bxrwlb7den its acceleration is constant? Support your8bd;5wpr/7srlm+x b a answer with an example.

  Suppose that an object is moving with constant 2bf 27+dnnc- snupkxo(q5kp+ acceleration. Make a statement concerning its motio2 u o2 +57ncb-pnxq knfksd(p+n with respect to time.

  Can an object have increasing speed while its acceleration9rbrd8x7f.90 ciaqe gth*j f1 is decreasing? Support your answer wi8tf*9i r b7 0xf9aed.h qj1rgcth an example.

  Suppose a can, after an inig)x()oo mv+yrlt z+x0tial kick, moves up along a smooth hill of ice. Make a statement concerninl)z+0o(mo )tx vxr+ygg its acceleration.

  Under what condition is average velocity equal to t(-iw4 h40typds7s0,v07s wm wviwu h ahe average of the object's initial and uyh7shsa4piwvw v4(wt,m0-0 d 0sw7 ifinal velocity?

  Objects A and B both start at rest. They both accelerate at the same rate. Hoj;z 0*kfjo7 oqwever, object A accelerates fjz0fojo;7q *k or 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 ac l4a(yq2 osrten ;-ali-k26vhcelerate at the same rate. However, object A accelerates for twice tlqki(;o r2-2- aheatv6 syl 4nhe 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 the absence of friction,e,a89 s8meyvkiw /ij : which of the following is true concerningj8 a9/8wi se, y:miekv its motion?

  When an object is released from rest and falls in the absenc6;n(fj ,vmw;0dj l mape of friction, which of the following is true l0 6v;(jam; jd,mw pfnconcerning its motion?

  Suppose a ball is thrown straight up. Make a statementqx6p f+eqsb ,/ about the velocity and the acceleration when the ball reachefb,s/ qp6+xeqs the highest point.

  Suppose a ball is thrown sl5 +w8 fptx.yrtraight up. What is its acceleration just before it reaches itlfrp t8.wy+ 5xs highest point?

  Suppose a ball is thrown straight uc,g8sg-2 az vjp, reaches a maximum height, then falls to its initial height. Make a statement abgg8vca,jsz2- out the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then 20j f8rcgdsn(falls to its initial height. Make a statement about the direction of the velocity 0(c2n frdj8gsand acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the abse2w6 jahetju+7: v+ppdnce of air resistance. Make a statement concerning its acceleratpawu:v7 jhp+ e62jt+dion.

  Suppose a skydiver jumps from a high-fl:guz:);h j+cmuct7e x ying plane. What is her acceleration when she she reaches te:jt+x:c 7)z;euu hcgmrminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second ballbh4ghfih+3jv p3edd6u 2 m0 2t is thrown upward with a speed 2v (twice as fast). What is the bg 04pdt322hhif6djv +uhm 3eratio 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 buildzrpsob 4 edn3f(m.l5- ing. One second later, ball B is dropped from the same building. As time progresses,l-fbsm d3ep5z 4r.( on the distance between them

  Ball A is dropped frf :zzjk *0twpf(8dm,pom the top of a building. One second later, ball B is dropped from the same building. zj(mf8,fzp:pk0t* w dAs time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall buildin7y z/4 t6ue1 lwze5wbrg. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit th5lt 4wbeer 71/6uzzwye street?

  A brick is dropped from the top of a building. A hro 6( tdr0wf3 b4rq*fsecond brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerat0 qdf4bo63(r f wh*rtrions of the two bricks.

  An object is moving with constant non-zero vq gs)4q5m;gu3eo-k sfelocity in the +x axis. The position v34 )e o;mqguq s5ksgf-ersus time graph of this object is

  An object is moving with cofw9 nt2f8qpv.9 wughv.q /d 9vnstant non-zero acceleration in the +x axis. The position versus time graph of this obje tw2w89vff.dh9/vu9. qngp vq ct is

  An object is moving w -tonnbyx.5dbu ,usd0) c 4z+uith constant non-zero velocity in the +x axis. The velocity versus time graph o4x +ds5b,nuubcu nod-).zt0 yf this object is

  An object is moving with constant85-gqw*msa3eq- cmmz non-zero acceleration in the +x axis. The velocity versus time graph of this object ze m-3w-ag8*q5ms cqmis

  The slope of a position versub .rg9anmq0tf/1a5t xs time graph gives

  The slope of a velocity versus time graph givklgw n k7s a;.o+wc.*ves

  The area under a curve0 im;enh j+1jn in an acceleration versus time graph gives

  The area under a curve 9qmp +sp p a65acp+,bjin a velocity versus time graph gives

  If the position versus timelbuwk1 :gv b56 graph of an object is a horizontal line, the object i5 g:u1v w6lkbbs

  If the position versyg 1+fa)b nz;fus time graph of an object is a vertical line, the object is z1gfn)bf+;a y

  If the velocity versus time graph of an object imu ca i;(v4wfm m(pos77 k.7hrs a horizontal line, the object sh4v fmma;7 77owrukmi((cp.is

  If the velocity versus time grapu,u+k hedy5q)h of an object is a straight line making an angle of 30 degrees with the time axisu ed yk+h,qu5), the object is

  An object moves 15.0 m north a)a-6yfvxxfk*s 5 srg9 nd then 11.0 m south. Find both the distance traveled and the magnitude of the dis *) 5rf f-gxvxyak6s9splacement vector.

  A boat can move at 30 km/h in still water. How long will it take to mk2uy(t(2 (y aswbfl :zmskst65,ntu1 ove 12 km upstream in a river flowing 6.0 km/ha6m ty5bfy2k( nt1 wl(k,z:ts2s u(su ?

  55 mi/h is how many m/s? (1 mi = 1609 m p.p x.j/5/rdx h4eznx)

  What must be your average speed in order to travel 350 km:o2(0t1gee 5gq6isa *c zkhgd in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 l2uzez99p3 * m,e7 buw; y1myat :zjegmin. What is7 wl u1;*zug,ba9y9j teyzz e2:mm3ep the average speed of the runner in m/s?

  A car travels 90 km/h. How long does it tb.wqc. gsi:3take for it to travel 400 km?

  A ly (light year) is the distance that lmi16ppy t -nsvxf:3s)pf4 y/lo f9w(might travels in one year. The speed of lights/:4vpmfl( 1i -6)wnoyf ys ptf93pmx 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 fo+hl7sd/z-u y6nb0h/ve4x hxlr 4.0 s, how fd+luvyh7slx/bh /-6e0zhx n 4ar do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), m 5b pnn4-hako9eu/3tcoq2 mjn3i8* xin 100 s, your average -o *43 ma5jeucbt2on hqm9xn3nk8i/pvelocity is

  A polar bear starts at toscu;k- jad3j ,s56 edhe 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 d a;cjs,eko d53us 6-jtrip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 k4rovfs2kj( a 1uw em94m 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 th1rf ku2(9ojsv4ma e4 we bear's average velocity?

  You are driving home on a weekend from school 48ty sf .q ru86ot9gemat 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 homeetg8y t or.f4su986 mqtown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the averagnz0lj*3:cob9 pi lvv4 4pqw2 t,cfou6e speed of the motorist for olwclc v pnfp6z4j,v 234tq:9uo i b0*this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her abode:bo0vt; e1 c.r*kverage speed for the;v.oe ekbt0 br d*co:1 trip?

  An airplane travels at 300 mi/w7y y zy(rr;.:i6lguzej. yx 5h south for 2.00 h and then at 250 mi/h north for 750 miles. Wzy.rx(; yu:.567izw erg yyljhat is the average speed for the trip?

  In a 400-m relay race the anchorman (the person4rpd +c54b wxxzwtev4;xu 8f 9 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 the team A runner starts the final legwxf 5 v48c;+bwpx rt44exu zd9 of the race, in order that the team A runner not lose the race?

  A car decelerates uniforml/ ( kwszr4jm yj( cr(di+y9na(y and comes to a stop after 11 s. The car's average velocity during deceleration was 79 km/h. What was the car's decelek(wir+( am/4jcnydr y( (sz9jration while slowing down?

  An airplane increases its speed fromcb aam:z84eu *w d* m*x84gs5c+aa udgjp66td 100 m/s to 160 m/s, at the average rate of dabx*apms*:wc+z54 u* e8 dtdg6jc ga64m8ua$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at in iqlr(84ky pa9 u;5uthe 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 accelerate(gm hv6a .i3xls 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 6 she; x-uaxefgc+cl zy d+4*:up with a constant acceleratiocez -dxx:y l6e+g*;safu+h c 4n of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initiav(z r cqhl,ptxy/9/bq1kv 0 r7l velocity of 3.6 m/s experiences a constant acceleration oy1x 7q q(lvr9rh/c0ztbp/kv ,f $3.3 \; m/s^2$. What is the cart's displacement during the first 6.9 s of its motion?

  A bullet moving horiz w+r.f2z)bddq ontally to the right (+x direction) with a speed of 411 m/s strikes a sandbag and penetrates a distance of 30.88 cm. What is the avdfr.d bq +)zw2erage acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. It rj;olvr.+sh tml)-;q xeaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is cono)vm;r.s;jl+hqxl t- stant, what is the length of the catapult?

  A car starting from rest moves with constant accelerationn 5q8 20tsa-vzwm .gclw2pi1g 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 x3d-3xvkfws ,its average acceleration?v,skfx 3d w-3x

  An object starts from rest and undergoes uniformw-o+) cm: iulwlcx12r acceleration. During the first second ix w-2 clmrwl1ociu+): t travels 2.8 m. How far will it travel during the third second?

  An object is moving in a straight linecpvaqtu,tg(98k)l . a with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later itaagtvp(u 9 qclt,.8 )k is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates unifor g27z: ;yp60ysta zeu/s 4wxdrmly 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 5(ir-f dwka*s3ex 5eicqy;6b 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 thaxs42j r.uzqm ;t has been waiting at the intersection starts ahead with a constant acceleration omju s. 4;xqz2rf $2.00 \; m/s^2$. 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 the surfac nq0evjs. vm0cce;7ym: lzu50 e of planet X where the acceleration due to gravity e 50n7 ml0.e;zjycqvvs:cmu 0is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upwardsqe4ynwz9vgzp-smt; 8 dnt929z9)zw with a speed of 12 m/s on the surface of planet X where the a d98s 4 ew9 -mnzg9s;tt)zzy9vp2zwnqcceleration 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 a speed of 15 m/s on twi,pjj++qfc 7u5 j kqgi,r.*mhe surface of planet X where the acceleration due, urqfjj qi+ 7p,5wjmc+ k*.ig 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 tzzinxs g 7:6-qhe surface of planet X where the accx- 6n gz7:iszqeleration 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. uj1wc6 vyf1+li-sqqtoc 0g:2ea+ i x- If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you c 1uco1f- y0tga :-sc6x+iv 2wi+lq qjeatch it?

  A ball is thrown upward at a velocity of 19.6 m/s. Whap,yh nnxan113t is its velocity after 3.00 s n1,nya pxh1n3?

  A bullet shot straight up r uf,g:aevbb5k*d v o:bo ++hihz925a seturns to its starting point in 16 s. What is the initi,aohvzk5+:5 2ahvbuob+bg 9f: ised *al speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take wo u+b5;1 )mywi.3mi(c gouo yto return to its13)cw.(;y ou u ybgiomwiom5+ starting point?

  A ball is thrown downward from the top of a building with an initial sp/m)mj91xt.xdh4g1x qz1f l/a nvfn (x eed of 24 m/s. It strikes the ground after 3.9 s) xm j/nlmxv19z1nd 4.1qxf /(axthgf. How high is the building?

  A ball is thrown straight up wv vfj2sejc q5 +q1 ffswc*/9t:ith a speed of 30 m/s. (only fill in numerical value in theq sj21e+f w*jqft59cvf:v c s/ 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 a speed of 21.4 m( f5mx/3jo6vt-aptl k /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 1 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 14 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 14.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t =:fwgga9yyb p a/ ;dp-y4l0v f: 1.0 s?

  In Fig. below, what is c rs(m1-3obzathe velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.a,ndk4z/e o z20 s?

  In Fig. below, what is the vex)f*wtq;ak r o9ddbdf92a,6xlocity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 7 3adef.oeywt:znp *64.0 s?

  In Fig. below, what is the average vewl6shif6ycm pb8 .5 bv:,4odjlocity from 0 to 6.0 s?

  In Fig. below, what is the accelera 7r- jp9mshd7-zcb(q htion at 1.0 s?

  In Fig. below, what istbx50j1p.f,x opskuz(eh 66e) h 2btf the acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0 s? vne dx7:p4rm,xz.6lith dg)/ t/mw(m

  In Fig. below, what is the average e ugjplo 13.sr,ql-+ eacceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0 hgsi6t btp-xss5-8ba4 o3-ep,0cmmd s?

Does a car speedometer measu0u43swrcnly9 zm6 .8e3xo ssy re speed, velocity? {speed|velocity}

  An object can have a varying speed zgno8u0j9 sls, +aqd.if its velocity is constant.

  The velocity of an object can be nu;z73:z3qn9 ypi k rbhegative when its acceleration is positive.

  If one object has a greater speed than a second object, t urp9omu4l c7 v/etxl- )v-;nshe first must have a greater acs;n-7-u pvtl4 v/ r )mouelxc9celeration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a oxa 6b *hrplf/++t) anspeed 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 wuo 7tymjsd2+rb4 ak+s65p ;oits acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves the ba i0m-er2+3h ahmz oa.gt with a r2 0mh-oih.gamez+ 3aspeed 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 sh .iw5 4y zslhm 3hr.ff;.+xxspeeds up, what is happening to its acceleration, how do.xxfyh5zf3.h srl. i ;4mw hs+es it change if air friction is ignored?

  As a freely falling object speeds up, what is happening to its accelejozy ue cps5xp63 t*+8jc(u/cration, how does it change if air friction CAN NOT be iu* uz/p56spc(+t e8cyc 3 jjoxgnored?

  An object that is thrown vertically upward will return to its original posnr hjz5 k(t*l5ition with the samlr*z t5nj5 h(ke 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 accelerd1a 6+ao ,eqee7 zo 80gtif5mnation at the same time.

  An object can have nonzero velocity and zero acceleratio z3sr: q,b;)d* 5jzut o6tralen at the same time.

  An elevator moving from the-),/jha kt:kgxvm w 9ckc l1h, second floor to the fifth floor making no stops along the way has zero aj h1aw ,cv 9:lx/)m-,htkkcgkcceleration all the time.

  A rolling ball moves fro0 tnaxfdh+xi3.l9 h ydaw4 *9wm $x_1=2.3 \mathrm{~cm}$ to $x_2=-5.6 \mathrm{~cm}$ during the time from $t_1=2.5 \mathrm{~s}$ to $t_2=5.9 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.4 \mathrm{~s}$ is at $x_1=2.7 \mathrm{~cm}$ and at $t_2=4.4 \mathrm{~s}$ is at $x_2=7.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete;fcxvn *qda-a9+i7x-kov f/ l laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 12.1 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from it/qwjg2-/mf xup ff *8as trainer in a straight line, moving 113 m away in 11.0 s. It then turns abruptla mq/fu-2jfpx wg */f8y and gallops halfway back in 4.5 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 frrte)1w :g7vyq,l; jx g0q)pi-r dh ao.om $13 \; m/s$ to $24 \; m/s$ in 5.4 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 froo r )ind snxu3zl83:h9m $16 \; m/s$ to rest in a distance of 75 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reatb c8+w+tt 9uj0mswaeysu+7 ,j;,qiich a speed of $28 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.1 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of thye09 m 4a3sag+y/rygh yql8q, e blocks to essentially top speed about q+ah yg98 s4yam0e3gq rl/y,y $10.7 \; m/s$ in the first 11.0 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 speedoks w8a 36/iqi of $20 \; m/s$ to rest in 5.63 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. A suzo 4vjg)z3)ssuming a decelerati)3vsz o gj4)uzon of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck gox)j htuw.gxi1n5b ( 0sing $25 \; m/s$ 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 thez/z6nt fh +:.msux,ff 10,000-m run in less than 30.0 min. After exactly 2f:. xhuf,/szm znt6+ f7.0 min, 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?    $s$