Suppose that an object travels from one poi(x/ k9xsphbr 7mh1-yq nt in space to another. Make a compariso(kxx/1 y r hhm9bqsp-7n between the displacement and the distance traveled.

  When is the average velocity of an object equal to the i,dgcls3i3 ( ubnstantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty ;d ng3av q6j9hin 8 s"a3q6vhdg ;j9n . This is a description of

  An object moving in the +x axis ib,-u6za90 cz5y7nv upn(qbn experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car travelsi12 e krc/wh,sq1(o * ugpv)sing to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement con )2s11,i pc(* kuohwrges/vqscerning its acceleration.

  Suppose that a car traveling to the West (-x direc9p1by:s 2i0; gmcvytytion) begins to slow down as it approaches a travmyib 91ys2py t0;cg:ffic light. Make a statement concerning its acceleration.

  Suppose that an objects0dzq jh4iejt5-(1 y m is moving with a constant velocity. Make a statement concerning its(5 hjd0 m sq4-1yjizet acceleration.

  If the velocity of an object is zero, does it meav*8 ncsks*r. bn that the acceleration is zero? Support y8ck n*b .rs*svour answer with an example.

  Can an object's velocity change direction when ilg ,.ep0ugd *rts acceleration is constant? Support your answer with an exa*.rge ,d0ugl pmple.

  Suppose that an object is moving with constant acceleration. sl+.w +ot0 fw8 jyrdkzjby,)pc-1w. m Make a statement cyt+mk,+j- cw0wob .wl.frzd1jy8p) soncerning its motion with respect to time.

  Can an object have increasing speed while itvd;9td jz7;bu s acceleration is decreasing? Supporuddb ; jv;z79tt your answer with an example.

  Suppose a can, after an iab5 d7k- .mzv;mmg (ifx/ 5qez6sxa8knitial kick, moves up along a smooth hill of ice. Make a sta (/za5qgmb.5x7d k -skxf8mm6vaezi; tement concerning its acceleration.

  Under what condition -hdiqp( 564pm*h hb lzis average velocity equal to the average of the object's initial and final d6-hhhl4( 5 p*biq mpzvelocity?

  Objects A and B both start at rest. They both accelerate 1(e5s;*p vzb9yr2bfb p bwz(nat the same rate. However, object A accelerates for twice the time as object B. What is t ;e2nybp pz1zb* r9bwv(5bf s(he final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at t8 on lyirqz2zk4 .:-uzhe same rate. However, object A accelerates for tzuon i:8lzkr .4q-y2 zwice the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released frd / 3jd*dk7rrx9hfxw -om rest and falls in the absence of friction, which of/kd d h7rxj fx-*r93dw the following is true concerning its motion?

  When an object is released from rest and falls in the absence of friction, wh;,wa( .r*.bm(yrgilhd ln 3quich of the followingy.n;graqwl*ibru.m l ( d3,( h is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statementwj juc9 amods2r-0 )w2 about the velocity and the acceleration when the ball reaches the highestsr aj2w09c-mjud o2)w point.

  Suppose a ball is thrown straight u:. 1 -tt (trlhqpq7nnpp. What is its acceleration just before it reachesprqqt-7:nt ln1h(t p. its highest point?

  Suppose a ball is thrown striqvc +, )z-pgdaight up, reaches a maximum height, then falls to its initial height. Make a statement abo) ,dgiz+vp- cqut the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight u bhajxk,:8t6: ,jdjajp, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as thjbj, ,kaa8thjd ::x6je ball is coming down.

  Suppose a ball is throwk-810 3odev0q zcq uk8utlue+o 8zcz)n downward in the absence of air resistance. Make a statement conce 8udz0qvc kzoz8c)utl-uqo e0+k813 erning its acceleration.

  Suppose a skydiver jumps from a high-flying plro5:tj9 ;f.dfaot 3cuane. What is her acceleration when she she re9;53ut ra cdff:.jt ooaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An idec(q cd w x-ltb8f8u:/v* mcw(yntical 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? (Ho8w :8cfb(dv x(cuyt qc/-wml*w many times higher does the second ball go than the first ball?)

  Ball A is dropped from ths ac)pf42aa3i e top of a building. One second later, ball B is dropped from the3sa2f4ca )ap i same building. As time progresses, the distance between them

  Ball A is dropped from 53(n1 7rep hzmja(rj 1wap1ezthe top of a building. One second later, ball B is dropped from the same building. As tih 1n3raj zpjz(r w 11e(ep75amme progresses, the difference in their speeds

  Two objects are thrown from the top of l) 4yqoybu3oww4w;8i a tall building. One is thrown up, and the otw8yqi43bw w4 uy;oo)l her is thrown 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 build7o8gqww;x o5ying. A second brick is thrown straight down from the q5g7ww o8x ;oysame 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 the +x axis.thj7d0* kg afy4;nf*w6em ,h v The position versu*w *dj;k,afh 67eh4t0n mfvgys time graph of this object is

  An object is moving with constant non-zero acceleration iy.r,s;tk f 8lfuswp3 0n the +x axis. The positu.fssf8k;0 plw tyr,3 ion versus time graph of this object is

  An object is moving with.sag (51czh qq constant non-zero velocity in the +x axis. The velocity v.1 (cha qqs5zgersus time graph of this object is

  An object is moving with constant non-zero acceleration in the h :svu29+3 2fdfhx t x1dv.imj+x axis. The velocity versus time graph of this objectv.u3hsj2 1:v fd+i9htx d2fm x is

  The slope of a position ver.njpd6 tm (7ed xp.a(ysus time graph gives

  The slope of a velocity versus time graph zvl etl0. s:s(gives

  The area under a curve in an acceleration versus tim3 -t3ms91hadqv ny.cf* i+bqlq f4i0me graph gives

  The area under a curve in a velocity vkauhg 1q4ff65fgd-ei l h.+g/ersus time graph gives

  If the position versus time graph of an object is a horizontal line00wle:z vkf( i, the object lf0 (vw0k: zeiis

  If the position versus time graph of an object is a vertical liz+36 3s 30lksu em naf,fk0tcyccg(2kne, the object is kselt +3 g,( fncmky60f0zcc3su3ka2

  If the velocity versus time graph of an object is a hori/ , k5rxdftr 9ghsltv3+sk;xv)y ./jqzontal line, the object is,vth yk +tql/;xrs 9/f gkv5rd.x)s3j

  If the velocity versus time graph of an object is a straight line malrh h28lz0 ;llmofte/)g0i.h king an angll.gehto i0r2 8ml0h)hz ;lfl /e of 30 degrees with the time axis, the object is

  An object moves 15.0 m north and then g1zb ;ogfbf9sn1g*d la*/ +o o11.0 m south. Find both the distance traveled anf*/anbf gs1z g1ob*9 l o;d+god the magnitude of the displacement vector.

  A boat can move at 30 km/h in st3malvm x7os5g :q9z s.ill water. How long will it take to move 12 km upstream in a river flowax:3 m szom5l79s.qvg ing 6.0 km/h?

  55 mi/h is how many qpv: q(s70b;ouu3vdqm/s? (1 mi = 1609 m)

  What must be your average speed in order to travel 350 km in 5ql7fyaqu,bo)2*tgv-4r2ilw n o7wag0 4 l8 zh.15 h?

  A runner ran the mara - c1meg yiaxixa bkr(,jcw h//542/lnthon (approximately 42.0 km) in 2 hours and 57 min. What is the average spxai/i /arj5b,ckl2m4x-wc e(ny h1g/eed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to tvv 4hi pq83c4qravel 400 km?

  A ly (light year) is the distancuty.,)k9z 7cw: qw zpn;pr(ipe that light travels in one year. The speed of light pzww ntp; yp.9 r:k)c7,i(zuqis $3.00 \times 10^8 \; m/s$. 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 f fw p3u8/,jtumor 4.0 s, how far uupwj8/fm t,3do you travel during this inattentive period?

  If you run a complete lf-z qoqbd -uq(/a+3qe oop around an outdoor track (400 m), in 100 s, your average dqaz oq-fube-qq/+ (3velocity is

  A polar bear starts at the North Pole. pd 9dc./j) gwsnzakme 9,9p*u 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 pointc,n.e9) wm udz pjda*/p g99sk. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It trave*e8yhfnsqh ;*k*obsxk xd 9 .6ls 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its9xfy kh*n.*qo h es b8k;s6dx* starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. It thent*scw 17z ,.elrf .pqv0t gve-r6 j.qa starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. Ho, -v0rav r gtfpcqze.*1lq7. js ew6.tw far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. Whatp7x k6:z j;5s v-scj d6r,umyg is the average speed of the motorist for s,6c6kj7g:ymv; p- suzj5r xdthis trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. h g* j8k5 1vudnmhm0*d4/kxji What is her average speed for the t/ j5*8i0ukjhxm kh*1g md4dnvrip?

  An airplane travels at 300 mi/h south fo+tex,qtppkunmz1(ddt 8( -, hr 2.00 h and then at 250 mi/h north for 750 miles. Whatt(d,8 pzq(tt-u em,1xdhnk + p is the average speed for the trip?

  In a 400-m relay race the anchorman beg 6xe tf 6z7ie.:5ti(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 the team A runner starts the final leg of the race, in o ef btx75eeiiz :.t66grder that the team A runner not lose the race?

  A car decelerates uniformly a q+u-d:s s.zyqnd comes to a stop after 10 s. The car's average velocity duu- :sqqsdz +y.ring deceleration was 39 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 16 g 3*nlv,riu5f0 m/s, at the average rate of fglr*u 3ivn,5 $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate4 drvyr/t p6slmd.kj 0kq(ij6fcsx6qk-.2t. 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 accelerattf.8 jzp09 icges 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 s3be*r gehp5z4. It then speeds up with a constant acceleration oez3e h 5gbpr4*f $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocit+ebdm89eb /btv(i3eh y of 4.1 m/s experiences a constant acceleration of bb meed(b3h9 t/8vei+$2.9 \; m/s^2$. What is the cart's displacement during the first 9.4 s of its motion?

  A bullet moving horizontally to tkl916eni+ r zzhe right (+x direction) with a speed of 502 m/s st i6e+9z zlkn1rrikes a sandbag and penetrates a distance of 20.41 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 rejp;0 yf:/ eudsaches a speed of 42 m/s at thuj;0/psef: dy e end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves withirii *l*( itc5 constant acceleration 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. Whatxybi8rq0 g.0 s is its average ac.bgiyr 00sxq 8celeration?

  An object starts from rest and undergoes uniform accelerattteii egi2i m+3oi02u(*no so2qh(9d ion. During the first second it travels 2.5 m. it23i2hm tdesqi (o0e2u ( + *oiog9niHow far will it travel during the third second?

  An object is moving in a straighttpd hjr p:p+61*k; had line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is travelina1dtk*h jp :hr6pp+d; g at 10 m/s. How far does it move during this time?

  A car starts from rest andj f*jp ,dnoi+4 accelerates 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 drjrg;5cty(2t z y road 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 c+7q k0*dnweb1* n6bhw.xjd bxar that has been waiting at the intersection starts ahead with a constant accelerati.w+bhnxbx6 qeb*n*d 1 jd 70wkon 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 the s4x9 1mrs8nbq 8mm wy.st m3r5purface of planet X where the acceleration dm8yms3 1rm p9 4 mxsn8qbwtr5.ue 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 surface of planu94beo bgop zp5 ;mz +tdts5;.et X whers5dg ;9p.z 4p5bomet;t oz +ube 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 upward1mag +v9sx+ b-rmyurr ,jw i2; with a speed of 15 m/s on the surface of planet X where the acceleration due to u,a+bsm2r1 i +j -yg9wvm;xrrgravity 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 planet X who)afw2qm+ - yx)msez*e f+m)wqms*xza ) e-yo2re 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 us2,ckjk 1 ,2 mfc7oyyotually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to falkcf7yocmyktj ,12 o2 ,l before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. Wh z1 l6f0y2jvxyat is its velocity after 3.00 s?l 6jvz2x yfy10

  A bullet shot straight up returns to its start-ravjxaa g.n:dx lm/x:3i 4i0vyxu,ir99c; ling point in 18 s. What is the in av ui lgc,i9lvjaya.3:0;:-9/ixx rr 4nmdxxitial speed of the bullet?

  A ball is thrown straight up with a speed of 3jo.a8;ux9 k sz2 o2ybj6.0 m/s. How long does it take to return to its starting poin9xjsuob.8kzj y 2a;2 ot?

  A ball is thrown downward from the top of a build zz.4nw8xl my4c xfd5qsv -5x6d7 7aoeing with an initial speed of 15 m/s. It strikes the ground after 5.3 s. How high is the b5ez5dqc47oxx4x sa v-nz7 mw68yl .dfuilding?

  A ball is thrown str+bt q: pj3e+go0 x4d) bsfakw/aight up with a speed of 30 m/s. (only fill in numerical value in d4q+3x b /0kafsb :ojge)pt w+the 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 sn.;mk /w,ww o3wlk 2s38n a7gbsr:cawith a speed of 22.9 m/s. (use $g=10 \; m/s^2$, only fill in numerical value in the blank)
(a.) Calculate the time required for the ball to rise to its maximum height.  (数值)  $s$
(b.) Calculate the time for the ball to fall back to the height at which it was hit.  (数值)  $s$
(c.) Calculate the maximum height reached by the ball.  (数值)  $m$
(d.) Calculate the ball's speed 3 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 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 .vrug4l4a hmd57:usu the velocity at t = 1.0 s?

  In Fig. below, what is cq25 egw3 ke/ znql+u6the velocity at t = 2.5 s?

  In Fig. below, what is the velocthmp ls3qcc m 3fx3a,8/49 fn-bf gaml5jm,r )ity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 32q*;obusi dx0,mzh hvo cx72 5.5 s?

  In Fig. below, what is the av9ttds g w6s*a99zsh8px:)rz zerage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocitx:xs9:,ve ahncbhm *1l: )hw7ma2 py fy from 0 to 6.0 s?

  In Fig. below, what eciioa/2- qrx*k5/gg5zp om2 is the acceleration at 1.0 s?

  In Fig. below, what is the accs l(4aox5mnb8 8ho9vf eleration at 3.0 s?

  In Fig. below, what is the average accelerati28 rbqtzgoz rg*oev ,10((fkp2s.mv0srz1 rw on from 0 to 5.0 s?

  In Fig. below, what is the average accelerati,zc)1bz6uj ;/ v 69vbsnlizibon from 0 to 8.0 s?

  In Fig. below, what is k9 dn:iy */3odr kx5lxthe displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {r4od0 e(xgm4q dmre70speed|velocity}

  An object can have a varying speed if its,0chgep 4/ z ,esrneb- velocity is constant.

  The velocity of an object can be negative when its; u r9bc3kgmoo:1u3 kw acceleration is positive.

  If one object has a greater speed than a second object, the first must hava: odp g0l+z 5tr2d9hse a greater acceleration.d 2a ptd:gzhrsl+o 059

  Two cars emerge side by side fro/cq-noz w;n(yt+ke* tm 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 increasing in speed as its acceleration decreas;xogvu)(oi.l :dnd w1 es.

  A baseball player hits am,owm6evefa. ) 8oxl5n(f*z3j xf, zd foul ball straight up into the air. It leaves the bat w6 wox5v8 afmf( ).,odj*z exefnm3,lzith a speed of $120 \; km/h$. In the absence of air resistance, how fast will the ball be traveling when the catcher catches it?    $km/h$ (please only fill in numerical value in the blank)

  As a freely falling object speeds up, what is happe/gl*e;2dybjkh ,c le8ning to its acceleration, how does it d h/ eg;jeby*c2lk ,l8change if air friction is ignored?

  As a freely falling objlqnf * rxu:fp7+6jy 1nect speeds up, what is happening to its acceleration, how does it change iffqupn:n7j6*x 1+rl yf air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its originan nx*1kqopiy7g2s0c. r6 2egw l position with the same speed as it had initially if air resistance is negligible. If air resistanc1s0ny6.ikggocpr wnq e72*2x e is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the ix6vi/m5 iq5a/ is(fqj -rh8isame time.

  An object can have nonzero velocity and zero acceleration ae/t56 g1p/r qtre cv8it the same time.

  An elevator moving from tv t q8l8c2l7y45osx.*y zp ksphe second floor to the fifth floor making no stops along the way has zero acceleration all the tim7vlppx2z skyo4 .8y*l 8qt5sc e.

  A rolling ball moves from q 7uzqds3/xls,) obh8$x_1=2.3 \mathrm{~cm}$ to $x_2=-8.2 \mathrm{~cm}$ during the time from $t_1=2.2 \mathrm{~s}$ to $t_2=5.4 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.7 \mathrm{~s}$ is at $x_1=3.4 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete ymy7s mwj*5m3kw)r1 . ekdc+c laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.8 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainer in a straight line, moving 101 m awa;;asu,w lo,exi cr6 /mffvk51y in 11.6 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate (a) its average spu ;fx5vi,o; 6 /em1wfcar, slkeed  (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 fr i kr/w0r1htkzlk.rm, tvm* x0ou 7*k)om $11 \; m/s$ to $25 \; m/s$ in 6.0 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 from2 a k6rznd82fie8ok.e $16 \; m/s$ to rest in a distance of 61 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reacfd5t lko;l svxdh tp-4*:;ceppa5t31rj-h.uh a speed of $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.2 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially to0klybjc +:m6 op speed about ko+yl 6jbc m:0$10.7 \; m/s$ in the first 15.0 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 dix tkg6 g4;lp/dy; s7speed of $16 \; m/s$ to rest in 5.65 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, alm )cw j.y(;fdwz7zj * car leaves skid marks 92 m long on the highway. Assuming a decezm;*c d(lwy7jw ) zfj.leration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck go,sc25s y f*yfx+m1qks ing $25 \; m/s$ 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 30.0 min. After fnygr,52 z9p:f,n xl 5/qds cjexactly 27.0 min, there are still 1100 m to go. The runner mus 52f zg:y,5r/jxfl p9dc sqnn,t then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$