Suppose that an object travdlj)+re9c59 tsto .q3skxc 5k els from one point in space to another. Make a comparison between the displacement and the distance tr co3e+s t).lcx95ts d9krk5 qjaveled.

  When is the average vc1iru8. js6by elocity of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "fz*7y.rqs3/uqlr v f e,rom zero to sixty in 8 s". Thisfz /,rq7s*.y ulqevr3 is a description of

  An object moving in the +x axis experiences an acceleraqd :4 o6 rb6y,awa.ui*(ouv9bhn q*kd tion of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling tox 8ha.4ldjr(n the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement corxjan4ldh . 8(ncerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to s.)2sneex81 t iflnt6l nv9 hsu+c)b ,wlow down as it approaches a traffic light. Make i6fnebcv.t+sus 1 n,x)t8w h l)nel 29a statement concerning its acceleration.

  Suppose that an object is moving with a consta0b3 8:m-:/ rjz crltvwu x1yirnt velocity. Make a statement concerning its accelerationzjmi:1l-tr v3 yu:08bcr wrx/ .

  If the velocity of an object is zero, does it mean thrsugk a3-55fv-a*m l tat the acceleration is zero? Support5- sv5tarm3-gfk*l ua your answer with an example.

  Can an object's velocity change direction when its acpd1ajyf k ;rs-7d8ld *celeration is constant? Support your answd pyr dfa1d87lk*-j ;ser with an example.

  Suppose that an object is moving with constant acceleration. Make .xkvru ,l*x0, prv8dcw4 f6fkp6flnaj ,5zi8a statement concerning its motion with respecxdk u,jp5l 0v6kicf8, * r.a4znfp 6f8lw,x vrt to time.

  Can an object have increasing speed while itsd 1pe:zx (n8pv acceleration is decreasing? Support you 1xen v8zdp:p(r answer with an example.

  Suppose a can, after an initial kick, moves s-g93 g rdt phyqa*;ng600bmg 3zi4szup along a smooth hill of ice. Make a statement concerning its;s94t6 gzrp* m 3gqia3zhy ng-s 0d0gb acceleration.

  Under what condition is average velocity equal to the average of the objevb ou;; se4/bmfi21yy ct's initial and final u v;ob1yefb;m 42s/iyvelocity?

  Objects A and B both start at rest. They both accelerate at the same rate.*/qz38 jragcb However, object A accelerates for twice the time as object B. What is the final speed of objec rgz*qj3 c/ab8t A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same rateg wk151)emqhz d +fn/a. However, object A accelerates for twice the time as object B. What is the distance traveled by obk1gq /fedawhn5)1m+ z ject A compared to that of object B?

  When an object is released v5t47wfx c ykjg+95gib 78om jfrom rest and falls in the absence of friction, which of th8 og94mt f755vbj7jw +ykgx cie following is true concerning its motion?

  When an object is released from rest and falls in the absence of friction, w5;cz-wi am 6vc:fw pc*hich of the following is true concef5 c cipm*acz:w;w-v6 rning its motion?

  Suppose a ball is thrown straight up. Make a statement about tho,;ob 56wqgdgo*kuc /e velocity and the acceleration when the ball reacc bw 6ko/oqu go;5gd,*hes the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just before d yx n0kdn6b;m, io*,lit reaches its high,*ilknxbod6, 0y m ;dnest point?

  Suppose a ball is thrown straight up, reaches a maximum hei mu5zg6/v v0 y:lb)lzlght, then falls to its initial height. Make a stavu 5m0 b vylzg)ll/:z6tement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown stravqm7-p z i9)zlight up, reaches a maximum height, then falls to its initial height. Make a state-vzp li7m) zq9ment about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make a st)z mnl+()hnaxatement zah n)m)n+x(l concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleration wnshgfj u ab v+4f (z/43*:edmb)e8q unhen su(e/ af)*g deubzm4v3f+ s h nqbj4:n8he she reaches terminal velocity?

  A ball is thrown verticall, ty/ggz-z:vpy upward with a speed 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 tzp ty-,g/g z:vhe first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One second lagvc(w -bt ;9kuter, ball B is dropped from thcb9 v-twgk (u;e same building. As time progresses, the distance between them

  Ball A is dropped from the top of a buiirr p.+he,* xklding. One second later, ball B is dropped from the same building. As time progresses, the differeikxp.e*h +r ,rnce in their speeds

  Two objects are thrown from the top of a tall building. One is thrown- ndx1c 04*b:wire5loh6 c xopbx9t:t up, and the other is t tnoc6ct1b:*b4he 5plx xix-d w or09:hrown 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 busw)nn67 gv+cx2bg4a8g4e rmrp( 7jhhv w 55axilding. A second brick is thrown straight down from the same building. They are released at the same) 7v2g+r 4x7sr pnc 86wmjghnv5w ahxea(b5g4 time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocvy/dive5q0: j-fma.mw lkh w2c/9o p4ity in the +x axis. The position versuk-m 5ij9wwo 0m24. a//: clph qedvfyvs time graph of this object is

  An object is moving with constant non-zero acceleraqk 3ctuni,f5w)2l* i xtion in the +x axis. The position versus time graph of this obje*lwq ui3t,xi kcn )5f2ct is

  An object is moving with constant non-zero velocity in the +x axisn g/)l0ld jz6y. The velocity versus time graph of this objecgl z/)dyl60jn t is

  An object is moving with cgdw) krd7ictx 8:jvrf v:(iy0 o6 1yx-onstant non-zero acceleration in the +x axis. The vel vryfx:)r ydo0 7xwiitgcvk-8( j:d16ocity versus time graph of this object is

  The slope of a position versus time grap reg* 9 gj fhm40k;5.cbxpxhr)h gives

  The slope of a velocity versus timeim0z1xcs t30f)vdzo / graph gives

  The area under a curv c b92ou/caoi2e in an acceleration versus time graph gives

  The area under a curve in a velocity versus time-5 lys j01 *fbil6r+rnd quu)f graph gives

  If the position versus tyg,1bh)ou;0u zdqy,pk81 hi .+;.vl ctgzeigime graph of an object is a horizontal line, the object icg.u ,pk +y)0. b1ivy ol8egzdi;u ;1gt h,hzqs

  If the position versus time grapupotwkja9+va0 s+ 9kh 9(ex: yh of an object is a vertical line, the object isy9 :9xokw+akh +u9epaj0vts(

  If the velocity versus time graph of an object 5 ylz/c4m (dcvis a horizontal line, the object vlc z54y/dm (cis

  If the velocity versus time graph of an object is a straight line ma v; fdb 81niufkot:769+zvjp aking an angle of 30 degrees with the time axis, the ;76tkuv1nz+p: ba9v8ffo dij object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance trav/0 mltsz6+s gj6cc,vgelevc66jg,c/z+g0stl msd and the magnitude of the displacement vector.

  A boat can move at 30 km/h in still wxjrb)dq0q n4b6v9/ z mt 15vllater. How long will it take to move 12 km upstream i6v /xzq4 b1b0rjtqd)5ll9m nvn a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1ws .b0fph. q1k7xo5, m kqwt/y609 m)

  What must be your average nuee ,-x;gu hnxf t7ty52kw88speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km)w)z i lgh01+hc in 2 hours and 57 min. What is the average speci0gh) +hzl1 wed of the runner in m/s?

  A car travels 90 km/h. How longa8ll+u ,j,r6w n f8vky nkmz:pqy )8+c does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. bdjv8 vkhp*: jc;( (noThe speed of light 8pj(vv*h ; jc(:bnodkis $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/2kuo4 evcb5 0b bxpl. 3k1-wtjh along a straight road and you look to the side for 4.0 s, how far do you travel during this ina l1tb e0-ckv.w xb4kp jb5ou23ttentive period?

  If you run a complete loop around an outdoor track (400 m), in 10kwc.nl)yw p6)* kois2a;b x: c0 s, your average velocity iskwcxoks* ; ic))6ynb2 a:p.lw

  A polar bear starts ak04pr0nd ib rbkwb2ekv2( 3e +t 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 ti0 bvnerpb02b(e+ k2dk krw43o its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the Nort)e )j/yn+e to3liunhuc5* q *eh 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 trip takes 45 min. What was+c/) l5 eh3enu iot)qenu *yj* the bear's average velocity?

  You are driving home on a weekenxm -oterv:9-v8 mne8bd from school at 55 mi/h for 110 miles. It then starts to snow andx:m8nb ee9vot -v r8m- you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 8yt+ kkxu (g*dc;uv+*g 0 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this truk( dt*;g *cvk+xgy+u ip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h luwo 6w3nb5yg7 rf2b-tq+ *x n7; nxapkq;x/h at 100 km/h. What is her average speed for5/ xnl;u7p6g rnqoh2wx a*n7k-3b+btf ;qywx the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north foiiun;0 i .ius k,k14;g,vsh udr 750 miles. What is thh; u,u1kn; ss.ii,0iiugv4 dke average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs tqa y mk,5xb7v4pk7 ga22f6 xpdhe 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 th vax,2k7pkmp6d57 b4gq f2xaye 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 aftr0 (l j1faw3verage velocity during deceleration was 39 km/h. What was thejl1(w f3 0tfar car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at tdzq2iq3pa.u 1s dj6f 2he average rate of 2s id3z21a.u6p fdqjq$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates atmr ,25b:ji8g(xksqx, c t/ ecy 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 re 7 yp9 m976z7:qxi 8wyqgf9rmp jlyhg4st 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 forsk(/8mje k-bh;9 e mnn 10 s. It then speeds up with a constant accelerationk-n 8;k(beemns /9jhm of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocit bs p.)ahi5(nny of 7.3 m/s experiences a constant acceleration of is( a5b nnhp.)$3.7 \; m/s^2$. What is the cart's displacement during the first 8.9 s of its motion?

  A bullet moving horizontally to the right (+x dir 7w(pm.+n (zt zgc5cbqection) with a speed of 536 m/s strikes a.cq7cz wz 5gm+ (b(ptn sandbag and penetrates a distance of 16.16 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched fo fu/k.biz9;w rom a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the cak o/uwib9.f z;tapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleraty0i hbg5;dbemoha4 604u1mz dion 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 average a2a (z9qd 9wfnqsr ne+,utr3p x3-:ymgcceleratiq(m x2z- q 9dn3y+arnps9te: grfwu, 3on?

  An object starts from rest and undergoes uniform acceleration. During .ji )70e gttmyk, n+fnthe first second it travels 9.8 m. How far wi)nenkygjf, 0 mti7t +.ll it travel during the third second?

  An object is moving in a straight lclpp bo lu5mhw1b*/hp*y 0/e7ine with constant acceleration. Initially it is traveling at 16 1ph b/u5epbph o 7clylw*m*/0 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 accelerates unifst*g9e2zjt)zx lzqnc* (:w8a( zz2yi ormly 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 dece ct 0akaqoiedzh7 esat27b0tkj : 0/4.lerate 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 tra7*gm9/juh mmdffic light turns green, a car that has been waiting at the intersection starts ahead with a constant acceleration of jm 9du/gmhm7*$2.00 \; m/s^2$. 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 l2mx4kec7ln ) 6( /usnl8a oqf(lag6x planet X where the acceleration due to gravityl/c f )x (ls6xl84on (elu6mqk7ag2na 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 kxsxox 5-:q-cof planet X where the acceleration due to gravity: xxxk sqc-5o- 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 thea buf*146khag surface of planet X where the acceleration d*ak4 1f uhga6bue 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 oxep;m; vxjpmt u8r*, .f planet X where the acceleration due tom; v,rtpu.xp*ej8mx ; gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greatxd 20di8enm4 it/fg(her than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far cadmn / xg20 8fd4eiti(hn 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 velocity afv t 5i lzv;s.o58sg4yuter 3.00 s8 ug5s i.4z;vvoyst5l?

  A bullet shot straight 0 dubhst fd((.up returns to its starting point in 5 s. What is the initial speed of th (( bdudhst.f0e bullet?

  A ball is thrown straight upgg 4rc -(k idrjo.09yu with a speed of 36.0 m/s. How long does it take to return 9-ru0gi( r. cg4jkody to its starting point?

  A ball is thrown downward from the top of a building witri s,4f s;uz91pf y6rw*i*znkh an initial speed of 15 m/s. It strikes the groundrrf1zi *nk sw sf;pi,*94u z6y after 1.6 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fil ry t*ej(r-tx:l in numerical value in the blrtj*:e (-xyr tanks)
(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 straighj aj jw;7k.wc8e wl(;pt up into the air with a speed of 34.5 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 13 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 13.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.lg 5,bbw5a0v3domb 2i:ll2 o f0 s?

  In Fig. below, what cx v(5urwbse /pt9te(6om *,iis the velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 7x sb5u.39ntexhnh) vu xb )r;s?

  In Fig. below, what is the velocity at t o1zxmd h/bi 5qr14h j7= 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.06-zdn s-al3 q7b cnd/n s?

  In Fig. below, what is the average mwn,x -qh f k69om3rq8velocity from 0 to 6.0 s?

  In Fig. below, what is the accelerati-cfc n*jt grz;5 3ikhrj(7o ahet,t9;on at 1.0 s?

  In Fig. below, what is the acceleration j 7t9f/wjg 8 / avdq4otmsmu1f(4-cm sat 3.0 s?

  In Fig. below, what is th tcjc,evf(-se (d el))e average acceleration from 0 to 5.0 s?

  In Fig. below, what is the a ;bn70gea; yeexea 81vkq1nd )verage acceleration from 0 to 8.0 s?

  In Fig. below, what is the displ-+;wlmywac3q pn52e e acement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velocity7en l4 ia;. :c7 lxx9dzsa*nub}

  An object can have a varying speed if its velocity is co 69qpvx86j) osgd iq9gnstant.

  The velocity of an objekdqs: zbo+o38x 4px.a ct can be negative when its acceleration is positive.

  If one object has a greater speed than a second obj*l/eugc2w bm9 ect, the first must have a greater acm2ub9c w*lge /celeration.

  Two cars emerge side by sideul 2+t y()pfjjej 21nw from 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 sp+ , jsra +ilt3rvvbb+inhq)/8 eed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves the bat el o 37zxp0l.vytq-7xtac-k 8with a saylvlo 7c-.8te qx-zt0kp3 7xpeed 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 its acceleration, hkcq k -2z30qiubcq.h8ow does it change if air friction is ignored? i0z 2kch8ucqb. qkq-3

  As a freely falling object speeds up, what is happening tvx- kt+(98ulgx sfup7o its acceleration, how does it change if air friuf( k+su8l p-x7xt9gvction CAN NOT be ignored?

  An object that is thrown vertically upward will return to it28.m wzrlcwgy3l2a8 q (1vxkv s original position with the same speed as it had initially if aiyw23 82(vwmlr a 18cqgl. vkzxr resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity r y5. pk(.gv9nxta cx7and nonzero acceleration at the same time.

  An object can have nonzero velocity anaw( 1*p /o5ohl0mfjmr d zero acceleration at the same time.

  An elevator moving from the second floor to the fifthe*+ phqm-9z jp+at/ka floor making no stops along the way has9z-/*ea +pta+ hkp mjq zero acceleration all the time.

  A rolling ball moves frokg,k(d :izl ,x kj:g/rm $x_1=2.5 \mathrm{~cm}$ to $x_2=-7.0 \mathrm{~cm}$ during the time from $t_1=2.1 \mathrm{~s}$ 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 $t_1=-3.4 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ is at $x_2=8.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-ucr*mru wir,/ ku;24xmile ($1 \; mile = 1609 \; m$) track in a total time of 6.5 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 straighom ) fqqoxl/ea3n/ +*qt line, moving 89 m away in 14.0 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate (a) its average sp)oonlx+q q e/3f*qm/aeed  (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 frp*skm bk7syr ;-ly 55 zb2zcs*om $12 \; m/s$ to $25 \; m/s$ in 5.9 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 from -q o9hd5j fzc f0-+cyj+srhc0$21 \; m/s$ to rest in a distance of 77 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed)hxv zo8j 80u,muw(i- g6clcg of $29 \; m/s$ 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 blocks to essentially top speed ab /mhq,/pa(m f(m,y;lnnmia x t+6 (dtnout ; , fm,qh ndpy /(mtmm6a+n(tlax/n(i$10.4 \; m/s$ in the first 14.5 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 spee.pna n h50iyi xam6()nd of $17 \; m/s$ to rest in 5.07 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a abp5jy)gh/l61is dcjni * :,xcar leaves skid marks 92 m long on the highway. Assuming a decelldibc g*5 ns6/a1jxjp,h:yi ) eration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goigh6 4,cqq0ye gcy 6l jdj4he9v20brk /ng $25 \; m/s$ 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).    $m$