Suppose that an obje ph.0)k: 3ai7a3r0kea vqjxsjct travels from one point in space to another. Make a comparison between the displacement and the dixaja0s7avk) 3pkh r e.i0:jq3 stance traveled.

  When is the average velo jis 27e4*tnmez*zv-e city of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zen1cqp* dp7q o-ro to sixty in 8 s". This is a description ofpdn*-qc7q1 po

  An object moving in the +x axis experieu8 c-oh htduk6ov 5u--6 xztg4nces an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x di r ceq)ag164ocrection) begins to slow down as it approaches a traffic light. Make a statement co)o64qa cg1e crncerning its acceleration.

  Suppose that a car traveli+ (6d h4ji7jzkj9) qp(0wpkn djcp/ wqng to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceler(wnkd6zkdjp 7qph 4pcj(j9)0qi +w/ jation.

  Suppose that an object is moving with a constj8(+*sk 6 q /)nzj3n/qwxjl7wrifubyant velocity. Make a statement concerning its accelerakjyfi r*7/j)s/ wnlq 6w+3(nbzuxq j8tion.

  If the velocity of an object is zero, does it mean that the acceleratiox8hhy*k7s yd( n is zero? Support your answer sxy(d y*hkh87 with an example.

  Can an object's velocity changewy z;rpn.rh61x:a6 ttxgooa 84,4mve direction when its acceleration is constant? Surgoth648: 1mvaxyr4.p,a;xwzno t e6pport your answer with an example.

  Suppose that an object is moving withb19 8a/v hyx+s)bcdpc constant acceleration. Make a statement concerning its ms1x yapvh9+d8bc/) cbotion with respect to time.

  Can an object have increasing speed while its acceleration is iym 4xlpe ++ +v;x,+aaib1znqdecreasing? Support your answer +e+l+z1v4;ai nqy,x pmbxai+with an example.

  Suppose a can, after an initial kick, mo8bmrnz,z2jaw 19csr a-h4dp. ves up along a smooth hill of ice. Make a statement concerni nd h pzzb2c98s.a w1rmja4r,-ng its acceleration.

  Under what condition is average velocity equal to the average sg)9t2yerwjt42 oagh4- x) fzof the object's injt xe fyts9zg-44r ga22)hw)oitial and final velocity?

  Objects A and B both start at rest. They,awpr, 0d:b5f j jm7kf both accelerate at the same rate. However, object A accelerates for twice the time as object B.7kp ,fdw5 ,:bmrajfj0 What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They b2xvixxt50vl ;x )mwsw78xf r-oth accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled 0r xli5v 7xm2f)s8wx;xt x-wv by object A compared to that of object B?

  When an object is released from rest and vwn+kc/-i*.gfw hyb 6p /3vgrmfu 8 1ffalls in the absence of friction, which of the following iw/ +y ch1v6.38/v kpffu*ni-fbrggm ws true concerning its motion?

  When an object is released from rest and falls in the absence of friction, whm81,n t..igau+h- jtuq,mehj ich of the following is tq.ujhtu ma1 ,+.,hje t-ngm i8rue concerning its motion?

  Suppose a ball is thrown straight oj)4cw /uuwvku 60+huup. Make a statement about the velocity and the acceleration when tw0cu u vokwu/u4)jh+ 6he ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just before it vzl(,a uzk 7+ov1flz,reaches its highest p kul,zzvfoa,7z1l (+voint?

  Suppose a ball is thrown straight up, reaches tl,tht9l.p f3 a maximum height, then falls to its initt,lhlt3 fp. 9tial height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to its init+la0ikwpdl0, )w l -ki-l e1ubial height. Make a statement about the direction of the velocity and ,a0- k l)l il +0e-wpuilwb1kdacceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of q)d :mzxs 0e04 )nlzpvair resistance. Make a stateme ez)qd pvn4:)z msx00lnt concerning its acceleration.

  Suppose a skydiver jumps from a high-((+ i fud;g :)dhhh2 jjlx-ibeflying plane. What is her acceleration when she she reaches termin(fih x;ul+)j(djb g hhi d2:-eal velocity?

  A ball is thrown vertically upward w1afyj uc)og7 m8(w ch7)bei)vith 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 bac(gmai7fo e7 81cj)hw)v uyb)ll 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 6(7 fl+v4 e jxaqedy0gbuilding. One second later, ball B is dropped from the same building. jyg 74 a edxl(60+vqef As time progresses, the distance between them

  Ball A is dropped from the top oz m*pzw qpmj5 i8n l;qh w)*3*/fdgcx5f a building. One second later, ball B is dropped from the same building.mpwi8*p) z3;j qmxc/ n5*lqfdgzhw*5 As time progresses, the difference in their speeds

  Two objects are thrown from the top of a h-xo93z 8( dlvpr4u2kihuz.htall building. One is thrown up, and the other is thrown down, both with the same initial speed. z u-uo38xrkz4l.(p 9hd2hvihWhat are their speeds when they hit the street?

  A brick is dropped from the top 85;lsksx kc5kof a building. A second brick is thrown straight down from the same building. They arkk5xc8 ;ksl s5e 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. Thgf+ 0(xv*yzkle position *gkz0yx(+ v flversus time graph of this object is

  An object is moving with constant non-zero acceleration in tf,qt xpkxl.+x0 **jpa/g:ot n he +x axis. The position versus time graph of this obje xp**t xjx.fo:a,q+ ln k/0gptct is

  An object is moving with constant non-zero velocit 2y-qfa1f1r hey in the +x axis. The velocity versus time gfaef2 r1 -1hqyraph of this object is

  An object is moving with iwuimzr2 97(qconstant non-zero acceleration in the +x axis. The velocity versus time graph of thi z muiw9ir72q(s object is

  The slope of a position versusnr)rr3qy lc9h.x .f:z time graph gives

  The slope of a velocity versus time graph givess7u)yuaqol -.

  The area under a curve in an acceleration versus time grap ;sxyhpohm .e7,m9.vch gives

  The area under a curve in a velocity versus time gr-xk dr+f;ani; aph gives

  If the position versus time graph of an object is a horiz 980veex a8jw c-or0ezontal line, the object is0zcwrxee v90-aeo 88j

  If the position versus time graph of an object is a vertical -/l yepio+nn1 line, the object iso-el+np /1yi n

  If the velocity versus time graph ofht3h akq:8.r v an object is a horizontal line, the object : h a8qhrv.tk3is

  If the velocity versus time graph of an objecti tdqv: ;,1bs: v*c uaaul0bh3 is a straight line making an angle of 30 degrees wialb:1:3sh utb,;v cud0q v *iath the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance trab j1yv3dqfe1: veled and the magnitude of the displacemenq 1ybfv3jd:e 1t vector.

  A boat can move at 30 km/h in still water. How long will it take to 7h+:aw+emyd9 fa m5 snmove 12 km upstream in an 57yfaa: hmwme+ d+s9 river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 mzjbv4 mcj845y)

  What must be your averagh tpuv,6xk z4l3t5e j3e speed in order to travel 350 km in 5.15 h?

  A runner ran the maratv8in(x6 raf p9cu ,xy8hon (approximately 42.0 km) in 2 hours and 57 min. What is the a,vrpx89ax (cu86fi ny verage speed of the runner in m/s?

  A car travels 90 km/h. neeq+ ff/nysu / 7.fki5rp 0,o How long does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. Ty,tag33 9icvq c1zn g4he speed of light is i1 tc9yqng4 agvc33z,$3.00 \times 10^8 \; m/s$. 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 lookqd 4f,p;kh tw5*v gp5x to the side for 4.0 s, how far do you travel during this inattentive period,qgpdpv*kt4 w5;fx 5h?

  If you run a complete loop around an ou(3 c ytzrn5y-r(s*xa dtdoor track (400 m), in 100 s, your average velo(-*snc3yz5ax(t dy rrcity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0*m, aw(h578+ bh hfam kxbgnt; km east, then 1.08awb(m hg7am+ 5, nt;xhhk*fb km north, then 1.0 km west to return 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 travelpjiy6bx v6se7j0hni90 dl f6( 7t1jrus 1.0 km south, then 1.0 km east, then 1.0 km nrft9j0jix 60isple( 71b6 6 ndjuh7vyorth, then 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. It /fvmd* ijy(g xp:9 85cbl3 eudthen starts to snow and you slow to 35 mi/h. You a8u em dd(* lv/9x3i5p:fjgbcy rrive home 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 km/h. What is the avid.i g-y c4wz; cna5z8eragezai yc.485 -c;dgz nwi speed of the motorist for this trip?

  A motorist travels fo bs . u,f.v0axjz(gck*r 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed f0sfb .(g,uv x *kcz.jaor the trip?

  An airplane travels at 30dk00 jlo//xpe z )xi i2i9yqp40 mi/h south for 2.00 h and then at 250 mi/h north for 750/pyixej2 0loqxk4)/z ip d09i miles. What is the average speed for the trip?

  In a 400-m relay race n8 a bqpp)gevq,+gtf.b:f)m 8 the anchorman (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 order that the team A runnpapbq,q8+:8 )b)me . fgvnfg ter not lose the race?

  A car decelerates uniformly and comes to a stop after 11 s. The car's average vxyw :: rbn at59.2+xrnpdlr9selot rl:dxr. +w59b :2 y9nrnaspxcity during deceleration was 71 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 averypj7 e:o,og089jchxq tz 1)baj gk8 4cage rate of g7j1j0xzg9y4ohq:okj, 8ec t )a8bcp$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceh9 0o;ybrtg q.lerates 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 restab akf d) 2m2ggue.)a: 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 for 10 s. It then speeds up with a constant acc3wkzqwu596q x2q m4xieleratiozmx49q6w3qi2 kw5 ux qn of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial vett4 yz(ja77wn locity of 5.9 m/s experiences a constant acceleration oy t7t4aj7n(w zf $3.8 \; m/s^2$. What is the cart's displacement during the first 7.0 s of its motion?

  A bullet moving horizontally to the right (+x dire0, mvb3pkw+)e fw ;jivction) with a speed of 573 m/s strikes a sandbag and penetrates a distance of 34.80 cm. What is the average30wp )vfj+, m;bivkew acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is laujz .vdu o.b mz4 n15g-krb)7grnched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s.gnuo1r.dk7zg ) bv -4r5mz.b j Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with cogkwah2 f ,nmh7b5,d-instant 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 7 l5jyk4m yud+of 200 m. What is its average accdy4y5+um7 lk jeleration?

  An object starts from rest and ezz;qr 8 oa*lmf lgm4e ./9(zkundergoes uniform acceleration. During the first second it travels 6.7 m. How fzo/ *;gm(lfqze8a z 4ek9r.lm ar will it travel during the third second?

  An object is moving in a straight line with constant 7k(odq0r p xsp)t *q8eacceleration. Initially it is traveling(r*8pkx)0d po 7qt sqe at 16 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 uniformly a :/*ax6ay* maksm9pt:u/t ic chn:-qvt $3.0 \; m/s^2$. 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 drqy 9o2 h)3zfy yzy;en0y 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 car that has been waiting at the ul,nz l6re 95txq-z5pintersection starts ahead with a constant acceler,-zxtz 5uneq6r5pl 9l ation 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 surfac zu2q88xcz )tqe of planet X where the acceleration due to ztc8)xqzuq 28gravity 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 -ks 9mpg*o/t2-l0uk8sxf nwnav v;t .of planet X where the acc/ xsgvs pv- *afw.mknnu8 2ot0-;kt 9leleration 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 p dhmb(im q+:x:t8ue*u8v,ch a speed of 15 m/s on the surface of planet X where the acceleration due to+8m,ih (qe p*x:vbmucd8 :hut 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 planet X wlawu; tx/fi;js689yhxgs. l ;q8 nm6w here the acceleratsa/l .gt mwsyq ;;x;l6xn6i9uw8h8 jfion 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. If your friend holds ppd-acz4 , wx4sdwyaw7e: 0e8 a ruler be ya adzws p dw40,7:e-ec4px8wtween 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. Wha. mj* ep+zo7-. xbk*jdj mhf/cf6o x5at is its velocity after 3.00 s?-m.+hjx*6o *cke7f /d.bz5aojjfmxp

  A bullet shot straigh o; lgksavas/g s*)--ot up returns to its starting point in 18 s. What is the initial spel*a g-k)-gssao v/ os;ed of the bullet?

  A ball is thrown straight up bbq2 mj +.x)eiwith a speed of 36.0 m/s. How long does it take to return to its starting+. ix2mqe)bb j point?

  A ball is thrown downward from the top of a building with an initial )scalfsgrl4+n t;ykiz0 15) gyzcz23v1vw1kspeed of 16 m/l;z21)g3z4 1 5fi l vysk )cgay+scrw10vktn zs. It strikes the ground after 4.9 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numerical val p;(o dvd ozgptf9t5v/h3j2f8ue in tpzpdootg 2 dj hfv9t(3f 8;/5vhe 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 stra1n v 1xwvaauok1(e 73zight up into the air with a speed of 24.5 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 3 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 12 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 12.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t =a2+7 ek)byvyob q wnxg nu9:(- 1.0 s?

  In Fig. below, what is the sm 7b9o:lg1 l9rrw wu7b7+dzlvelocity at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 u n5s r9mdr k,vvieww23888hn s?

  In Fig. below, what is the velocityx)omi(l2. 9l td4pco f at t = 5.5 s?

  In Fig. below, what is+7)m gyozo7s6xoy5f s the average velocity from 0 to 4.0 s?

  In Fig. below, what is the aver*8o v a/osl,2f8vq(dy77oa qdox 1u+lo 3vukgage velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleratiojbs1z/pb. uesz2yrol(p (cg7 ,1+ qujn at 1.0 s?

  In Fig. below, what is the accel naw86(,rwqsueration at 3.0 s?

  In Fig. below, what is the average acceleration froqap.qjde*m 4- m 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 thhew+s8ps3 03hzas sui z227 5h izn v)xu9qm*o 8.0 s?

  In Fig. below, what is the mukch t:il4zop + :y7:displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {spjkl .0 nk/98yayq zea1vbwj;5eed|velocity}

  An object can have a varying spasqi5 yeog2-3u :7yy peed if its velocity is constant.

  The velocity of an object can g/nep s8q wl6-be negative when its acceleration is positive.

  If one object has a greater speed than a second object,i4vo1ldukt- aa/ 4(hz the first must have a greater a(k4za-d1uoi/al v t4hcceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling with 9kj8+nh j0ofsa 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 ,s lo9p8g-yq(fhw kt8 decreases.

  A baseball player hit7r6y pswy9n ;mx. d2 7:rmnnfes a foul ball straight up into the air. It leaves the bat with a spenr:ye wr nfmd s9 7.ym2n6;x7ped 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 ,w1kn p-cdg e 403yqulup, what is happening to its acceleration, how does i04lcykn 1-p,3 guqwdet change if air friction is ignored?

  As a freely falling object speeds up, what is happening to its acceleration, ho98o) qzv ba q5y/ 5 6x*(bzeosroihhc.w doexzo(685 h* eobyqb a9csio5 z.h/)rvqs it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to i3q*r5a uaj:mg(n,de* m7 vzzyts original position with the same speed as it had initially if air resistance is negligible. If air resistance is appr*ed*a vmj,n5q 3 zm7g zy:(uareciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at th fphs ++ /)anzrl wdwg*, 0bhoo6w2*ope same time.

  An object can have nonzero velocity and zero accel n0.q8iird bapc:7v p;eration at the same time.

  An elevator moving from the secone9i 3krleqj3uu-0 j p2d floor to the fifth floor making no stops along the way has zero accelera0 eejl2iuu33- kp 9qjrtion all the time.

  A rolling ball moves fr e22hb*c+zx okom $x_1=2.5 \mathrm{~cm}$ to $x_2=-7.5 \mathrm{~cm}$ during the time from $t_1=2.3 \mathrm{~s}$ 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 $t_1=-3.9 \mathrm{~s}$ is at $x_1=2.8 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=8.1 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-milx8tcod)+ 3aa2z pf. ) hbtsk4be ($1 \; mile = 1609 \; m$) track in a total time of 10.6 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 straighn d psm43o:ipe..url8 t line, moving 92 m away in 12.3 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) its l .o4pr nm 8p:3s.eudiaverage 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 frp9k( uhp f3: nlxf/b3fom $12 \; m/s$ to $23 \; m/s$ in 4.1 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 fromx7;ozss 5rwk4 ,)yyva $15 \; m/s$ to rest in a distance of 69 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a sa , teo xocs-;c::9yvhpeed of $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.3 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to espjk/ h0:9o dnosentially top speed about/9 konpjho0d : $10.9 \; m/s$ in the first 14.1 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 6woaw+qgf eeo5qah2(5r6vy , a speed of $18 \; m/s$ to rest in 4.39 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, h d0jsv*;l,(ubt kketh 2 6z,ba car leaves skid marks 92 m long on the highway. Assuming a decz6j *ht,db,b02uhk tse ;(kl veleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trubs+ 0b 9fk7i*bka +)mg:x sdatck 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).    $m$