Suppose that an object travelsw:d 9n4qr o:mf from one point in space to another. Make a comparison between therdfn :owq4m:9 displacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneoul7k-mc; xn4b gs velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty o,9 19 qfv9, sa1cyrseibb:ny in 8 s". This is asn,v sy :9,r9i 19fq1ecbboya description of

  An object moving in the +x axis experiences an accvhv2 dl0 v4 :s5dzgv/feleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to4n6(:ix4w7 zhu 3 clav uyb/ed the East (+x direction) begins to slow down as it approaches a traffic a y:4cw6hv/ 7l uxez4b in(3udlight. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow s9;:s9g nj xw0r+io4puzb 9vn down as it approaches a traffic light. Make a statemen vobs0r zp+ wgn99 :u4snji9x;t concerning its acceleration.

  Suppose that an object:/g2xwnu xayb (8dns+ is moving with a constant velocity. Make a statement concernin(dbgu a xx+wy:8/ s2nng its acceleration.

  If the velocity of an object is zero, does it meansjt5 *ni96n1ak) lm qmk mnk2) that the acceleration is zero? Support your answe s9 1a 6m2jk5)nlqmk ink)*tnmr with an example.

  Can an object's velocity change direct4. u msku-nf6mion when its acceleration is constant? Support yourf-6 nk.umm4su answer with an example.

  Suppose that an object is moving with constant acceleration. Make a 9 o 6r4pl3c akro,tt;jstatement concerning its motion with respect too,4patjo9 k6t3c l;rr time.

  Can an object have increasing speed whil uo0airos nz 5x*tc:0*e its acceleration is decreasing? Support your answer with an *r:c5uoa 0s0 nxtzi* oexample.

  Suppose a can, after an initial kick, moves up along a d/ rhh zn.72gxsmooth hill of ice. Make a statement concerning its acd /2.hzn rhg7xceleration.

  Under what condition is aver*7( *al ts8em /cwklorage velocity equal to the average of the object's initial and final v7sle mk(aoc r w*t*/8lelocity?

  Objects A and B both start at rest. wb3q 2jv0bn;1/ z ff7yq/l 3l8 fgksgj They both accelerate at the same rate. However, object A accelerates for twice the time as/8lqg3;fyk3gf7z snb2w/vjb jf q0 1l 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 accelerate atfx-j+jcxzq a)6 h6jl2 the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by objec qza x6-fj)26l+jjhc xt A compared to that of object B?

  When an object is released from rest and falls in the absence *n9k.pj -zsbhzoev 85of friction, which of the following is h8bs 5ovzp nje.*9-k ztrue concerning its motion?

  When an object is released from rest and.h+ut2m39xj fy ycpw ) falls in the absence of friction, which of the following is true concerning ixyy.92c3 h+ mpwt) jufts motion?

  Suppose a ball is thrown straightqqx+ef3y 1 7mqgec7 .h up. Make a statement about the velocity and the acceleration when the ball reaches the highes7 q3qmh+fq.gxy e1e7ct point.

  Suppose a ball is thrown straight up. What is its acceleration just beforjdl 6 wxkwx1k) i72ed-e it rilxwdx61jed k) 2k-w 7eaches its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, then falls toqahudy4) gra0y;of*.3h.zy n its initial height. Make a statement about the direction of theny3.razqy* u h0oyhd4)ga;f . velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum heuyiomiw.c;/ g9*9u hjight, then falls to its initial height. Make a statemen hc9.g j*9iuw/m;oi yut about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward inuuti v rb n:y/,p5ik2; the absence of air resistance. Make a statement concerning ub2, ri/;uyv nki:tp5 its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleration wv1, fl7,s s)xvp7nkknhen she she reaches terminal vkx)7vfl vn ps17,s nk,elocity?

  A ball is thrown vertically upward with a speed97akycwyn/qs mh+b 5 l8*pi o38/tbtk 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 highqc tpiyaymn93l+o7 bt8 b5 8hkks//*wer does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One secon3rdkmo, qweh 22+ l kbzd.8a7id later, ball B is dropped from the same building. As time progresses, 23k,w 72rbomhki8 zd lq d.a+ethe distance between them

  Ball A is dropped from the top of a buildinggdzd3) mbo:e ). One second later, ball B is dropped from the same building. As time progresses, the difference in their szmgeb )dd3 )o:peeds

  Two objects are thrown from the top of a tall building. fu;xc)3 )zgeoOne is thrown up, and the other is thrown down, both with the szgue3); ) xfocame initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of ajn* )zm499ec,tx 5s xtvluf-j building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air -9txt j,emn9s)jz*l c5v 4xfu resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. Thvoru r2uli,.+ za)n6 be position versu,rvou 2ub.)l +iaznr6 s time graph of this object is

  An object is moving with constant non-zero accel ftuxl)o: i/(meration in the +x axis. The position versus time graph of this m)i u( :/loxtfobject is

  An object is moving with constant non-zero velocity in the +mfaq xp6: pcg.wxr78 d xe,6iw;8 g:wnx axis. The velocity versus p .xfpmg:awq xrc;7w8g,6 6w8 iden:xtime graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. bm i wg327:g+ulo e6wimtg/r5The velocity versus time graph of this objecolw67+:e23 big tigwmg / ur5mt is

  The slope of a position veroyc(*8 rbx4sgsus time graph gives

  The slope of a velocity versus time grws.owoh -(+pm/ub(i rf: r0riu -(frsaph gives

  The area under a curve in apz5h8nztqk/um60 ruzd f.- j;n acceleration versus time graph gives

  The area under a curve in a velocity v cl eq:j+tn.d5ersus time graph gives

  If the position versus time graph of an object is a horizontal line, the ol.;pxm mt2(vx bject i( p;.tmlx vxm2s

  If the position versus tim5qbqwn0/xy j7 e graph of an object is a vertical line, the object is7xqjq y50w n/b

  If the velocity versus time graph of an object is a horwi9t);(s j zqw l)xe5dizontal line, the object iwwxed )s5ql;() ijz9 ts

  If the velocity versus time graph ofhpn2yuw ig374 7e; qkj an object is a straight line making an angle of 30 degrees with the time axisg7pyji7wn 3ukq4eh ;2, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both jxt* :pkwx/n c c5:d8uthe distance traveled and the magnitude of the dtnw:cuj8 5/ckx :*px displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to move 12za0 gu k7a04bdnp9ysj blbb29 g2 vu83 km upstream in20asy ualbjkn0zg872d93b94p b gvbu a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 m)c/ idk:p7h/e l

  What must be your average speed in order zodfx-)mr n pcs4 .2x:to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. n tr4 de)n)qd,walo 9l9m:g3hWhat is the average s)q m9d3 hndeg)lw r,a:o 4tnl9peed of the runner in m/s?

  A car travels 90 km/h. 8c 7.q(jlpezft 2 q5crHow long does it take for it to travel 400 km?

  A ly (light year) is the distance that lightrnz-)rzy/ h;v-z 0 vysha1z* l travels in one year. The speed of liz);sz- lrvzz-n*1v yha/ 0r hyght 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 j:4 s-h zjm97kuh2i pgkm/h along a straight road and you look to the side for 4.0 s, how far do youum -2z4ip:jhgjksh 97 travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, y ok6 j6,ic1 ,3 9tulgjtwy+v*ce(cua your avera6t+ cgtk,* yo,6(c9iacujyu elwj 13v ge velocity is

  A polar bear starts at the North Pole. It travels 1.0 km soygregl.db lv)r8d ;i-. 8 +qtouth, then 1.0 km east, then 1.0 km north, then 1.0 km west to ret;glt.8d8r) -.v d qeirby+o glurn 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-o 8dz;jz6p9fcg35x n6 i9hwm k enm3ex8s5g o 1.0 km south, then 1.0 km east, then 1.0 km north, n; 8hdxn sk8fxmejgm95 o5 39-gw3piz 6cz6oethen 1.0 km west to return to its 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. h ad:9 673c +lveir8mcr;rbhv.nhod *It then starts to snow and you slow to 35 mi/h. You arrive home rh*n .3m ;+r9dc6v chei8hldaovb:7r after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 khw.gdk3 65h szm/h. What is the average speed of 56s3h zkhg.dw the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. Wh+t ne-pdpv(y (ha,/ rnat is her average spert(/aey -hpd+n ,v(p ned for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north for d9-lm (hu:r*uoma +na 750 miles. What is the average speed foro -rlu9md nu(hm*:+a a the trip?

  In a 400-m relay race the anchorman (the person who runs the p9hnd- umbx+5y2: qsqlast 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 b52y 9u p:mnq -x+hsdqcan 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 1 /dn )lwqer8g,7vdd3x: fxl3do ij92a0 s. The car's average velocity during dew3jdo9 gx dn2xf3vrle78q ad,ld)i/ :celeration was 36 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the adlv5znvj td : 6/am2p,verage rate of 6 tjmv25znp :vl/da,d$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceleratrio3uu rpcgu8l i4 1u*()-q*ckkq 3 rmes 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 apwd 6. r2azs/xnd 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 speeds up with a constat lzjs5**6o vint acceleration l*6 ivo5z st*jof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 2.0 mrlv,be. b9a(l kl sh; ;ci3vsru52fsl 0+t dy;/s experiences a constant acceleration o5v3lbd ercv,;2s. fuhlsytaks;l0+b9 ;ir(lf $4.7 \; m/s^2$. What is the cart's displacement during the first 4.1 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 326 m/y,/ ayo r )ggkir4s1 i-nvaa8/s strikes a sandbag and penetrat18-ngav )syokig4y rra,/ ia/es a distance of 96.24 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launch1a mup ar)/an7ed from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and /) uaa7ma1nprthis requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest mov,d ns r;m*yc4ph26(gdxf1 cj aes with 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 d0 gura67 qce/p, x3fev 9fy4mbistance of 200 m. What is its average accelerat6aq7/3 f0mb,xce4 gr eyv9fp uion?

  An object starts from rest and undergoes uniform acceleration. During ty6pc +,aup nu:he first: p, +pcyuuan6 second it travels 7.5 m. How far will it travel during the third second?

  An object is moving in a straight line with consta4nt4) bmia ok:nt acceleration. Initially it is traveling at 16 m/s. Three seconds later it is tb m44 :nkoita)raveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accexk:k7bm brd /.,a .umvlerates 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 at h .izb.lobh7 5about $5.0 \; m/s^2$ 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 thab/;zro4c4ppkuj3 (tp22 *j5f tfk lhyt has been waiting at the intersection starts ahead with a constant acceleration *prpt j tkc k3zu/poffyj44(b252 l;h 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 surface of planet X whebcj2s-7rxj 5 nre the acceleration due to gravity7 j25rcb -xjsn is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of 1lxvih + 9cuk61- .brjp2 m/s on the surface of planet X where the acceleration due to +icrj p1vkhl- u6xb. 9gravity 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 the surface ofygs2-dtwc: m;t.,h08s ck -watcb+hr 4oos v 2 planet X where t2s0mrbctkts.a-dghc8 s-+ 4v; 2,w :c ooyhtwhe 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 speedtq0mt/ 8 yhph , uzul90ymvi,; of 14 m/s on the surface of planet X where the acceleration dmhm izypuvqlhtu/9 ty,; ,00 8ue 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 your1ns 6 x7belxp19o7ovb friend holds a ruleopx6l9 no 177sb1 vxebr between your fingers and releases it without warning, how far 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 ajc3 4w jn b.o3 (z.in02xkk4lttvm;avelocity after 3.i 0owtnjcan(m4tvk.j3 .xblk 3a;z 4200 s?

  A bullet shot straight up ks0h5lrl,+npi qc*q 54au0irreturns to its starting point in 8 s. What is the initial kra+ n,l0pi*04s5 uihqc5lrq speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it takeq*ku0-xf+n jf to return to itq-ukjx *n0ff +s starting point?

  A ball is thrown downward from the top of a building h t0 h4e4gf 1* y48gflsr4ndduwith an initial speed of 9 m/s. It strikes the ground after 5.4 s. How high il 4dg44nehr0tg 84u* ys df1fhs the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numerical b7.-nik i7wbarb0dvf53y ,fsvalue in the blann5.7b avi k7wb 3fsbfd-,0 iryks)
(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; nb3 k v o:oape.(y iegutd+ck(x*(5d speed of 46.6 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 11 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 11.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity ac24qln6hc nywp42)ukr (j/h kt t = 1.0 s?

  In Fig. below, what is the velocity at t = 2.5 s n h0581qttz40jpg/n3jngxb a ?

  In Fig. below, what is th9 pvf:q5v(nm 47wsb bye velocity at t = 4.0 s?

  In Fig. below, what is the velocity at - wa5xa-t jab/5ou)bct = 5.5 s?

  In Fig. below, what is eedwv(l+qp p 9k-/cu6tt 4ja -the average velocity from 0 to 4.0 s?

  In Fig. below, what is the average vlt +z2xylfoz/, (khq +elocity from 0 to 6.0 s?

  In Fig. below, what is the acu3xyxl.e5kl um5n07 eceleration at 1.0 s?

  In Fig. below, what isqycey0d.2g vw :a,v +w the acceleration at 3.0 s?

  In Fig. below, what is the average accelera-vxl46hpyb5-gfty h *tion from 0 to 5.0 s?

  In Fig. below, what is the an yzurr:0naa*;f-8qy verage acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0 s?vbauknv+b s /b e-rcdt)0; 9s7

Does a car speedometebrhs9jyr6q8;4ygj 8f lr05 a88 hb tjar measure speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is cons9hmi )z,x(shf+.4t q r j9japg;bahu9tant.

  The velocity of an object can be negative when its aczr lp b-1ycw7s6tc4l 1 x5g7ibceleration is positive.

  If one object has a greater speed than a second object, the first must have zt kz6k u23ml(a greaterk 2lmkz(6tz3u acceleration.

  Two cars emerge side by side frkyo/enm;s3slz: k* 3 v vs*+79iecppjom 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 yszhrid0yx2 e kbo6i5j3jm 88wq3 9 (ras its acceleration decreases.

  A baseball player hits a foul ball straight up into7stjmf*3v xol wuv -1, the air. It leaves the bat with a speed*,f37 lwtu1-vx msj vo 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 o(iqo3; q z6vfr) -liwbbject speeds up, what is happening to its acceleration, how does it change if air friction is ignorediviwqbo (rqfz-l 63 ;)?

  As a freely falling object speeds up, what is happening to its acceleratio7zsy( n8 hz :dfrip,1y2rk yt)n, how does it change if air friction CAN NOT be ig1rn h2 d7 ):yyr,sz8yk(itzf pnored?

  An object that is thrown vertically upward will -ro,mpw8z+nghm;y:t j4 4szm return to its original position with the same speed as r;4jmzs on m mtyhg-p4, :8+zwit 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 accelerationmzz kz/v3t- j t pf1ib1dfw07+ at the same time.

  An object can have nonzero velocity and zero acceleration at the same time.6b8*i; tx0;m(yrppc z; x 5p kgdbl7jv

  An elevator moving from the second floor to the fifth k3 pyg)l6rcgfg14nx )lle x 92+mi j*nfloor making no stops along the way has zero acceleration g6ylrg42*i)fl xm)xgc ne9 p3j1+kn lall the time.

  A rolling ball moves froott )et0 *4j6ulcvra,m $x_1=1.9 \mathrm{~cm}$ to $x_2=-5.5 \mathrm{~cm}$ during the time from $t_1=2.8 \mathrm{~s}$ 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 $t_1=-3.2 \mathrm{~s}$ is at $x_1=2.6 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quaey 0p7yq v, kzslg9o53rter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.2 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 97 m awap7941payg (r+ln enuiy in 13.7 s. It then turns abrur7n4nalpiue9 +g1p (yptly and gallops halfway back in 4.6 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 fris3j l.e0jrlaa ql,98 om $12 \; m/s$ to $24 \; m/s$ 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 fro)q(q vm/t0y-y8rxzhqm9ik: fm $16 \; m/s$ to rest in a distance of 73 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed ofe 4p1x iv)d q(*ywf;qz $33 \; m/s$ 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 block;l5dvzrl ,xc m*pof(1s to essentially top speed about c v5 lrl d;p*mz1x,(of$10.1 \; m/s$ 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 e;jst.1qw jowk;iv/x.je4n7 roj)5wspeed of $21 \; m/s$ to rest in 4.05 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 -yo ( z04dykgtthe highway. Assuming a deceleration -0( oytd4ykzgof $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goia*x 1q-2(z fmp6qqjftng $25 \; m/s$ 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 10s6h qzis *(s ;nna1qa0,000-m run in less than 30.0 min. After exactly 27. ;hsaq* s6i1ns0nz(qa0 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?    $s$