Suppose that an object travels from y)cz sk3fb6h- ouy;.done point in space to another. Make a compausoh 6kbfyc-d;)y.z 3rison between the displacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous velocity?j:,3,tfu wspkl; p fovn5ty6 (ezk75u

  A new car manufacturerigwbt2ex 8qx m 2k6 y(w1f*/wi advertises that their car can go "from zero to sixty in 8 s". This is a desf i2xkw 8 6*ymigewq1tbw/x(2cription of

  An object moving in the +x axis experiences an ac x9zrk5uz6)gxgl1 3 abceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x di v*r ;7mjomr/zrection) begins to slow down as it approaches a traffic lijm7r;mr/ v oz*ght. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow df*g l4 q )*c2cghhdzn2own as it approaches a traffic light. Make a statement cng*h dhc*) q2l fgz42concerning its acceleration.

  Suppose that an object is moving with a constant velocityt:i4j*tl ), c 01bvhpny6dh kg. Make a statement concerning its *tnjc:i40 1ly hhpv t)gd,b6k acceleration.

  If the velocity of an objedmpm bis181+w ct is zero, does it mean that the acceleration is zero? Support your answ81p1mb sd+wmier with an example.

  Can an object's velocity qp)o fi3/cc-yu 8;de fchange direction when its acceleration is constant? Supportf/y8) o ucfd3 qce;i-p your answer with an example.

  Suppose that an object is moving with constant accelerat* dr vgnhz2 y6--crp6eion. Make a statement concerning its motion w2gc *zpr6-n e dhvr-y6ith respect to time.

  Can an object have increasin3d9v8oce- e 2qn2k/iongk 9vng speed while its acceleration is decreasing? Support you-nkk2eq9dn3 9oiov/n ge 82cvr answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill oxry0yzi5 4z bv n-0rh-f ice. Make a stat bxi ry5znhy-0vr0 -z4ement concerning its acceleration.

  Under what condition is average velocu 0a :)t u:e7fv4baierity equal to the average of the object's inaa7ti:v e0 )4b ruufe:itial and final velocity?

  Objects A and B both start at rest. They both accelerate at the same rate. H s( w60obgfey(il5 rx3owever, object A accelerates for twice the time as object B. What is the final speed of obje0glf( ix6rb35 wyo es(ct A compared to that of object B?

  Objects A and B both start fr,kcaend2 rq0/1m o;v nejt; f) ,mt:rvom rest. They both accelerate at the same rate. However, objjnd,v 1e 0 cq 2vantrmm/o:kf,re;);tect A accelerates for twice the 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, which i+9xdxmh/dt5 of the follit x+5d/xd 9hmowing is true concerning its motion?

  When an object is released from rest and falls oxr*pe+k 9h*h in the absence of friction, which of the following is true cok ho**erh9px +ncerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity aqe) t b lgmmnou0(+,u+nd the acceleration when the ball reaches the highest p ge,+tulumm0nb+o)q ( oint.

  Suppose a ball is thro usfz. wk55t0 d0wx7ygwn straight up. What is its acceleration just before it reaches its highezu t.7y0x fkwws5g50dst point?

  Suppose a ball is thrown straight up, reaches a maximum height,/6q 3w1 zvbbsq then falls to its initial height. Make a statement about the direction of the velocity and acceleration as qq wv /bbz36s1the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then f:3ew)0 +ox.ntl5/ral4tot . emgpo tballs to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming dow +0 o)btt4llp ./xwte:n.5m3 g troaeon.

  Suppose a ball is thrown downwarqi +e ef34 ve*ax98n8 q8w2 vnwqkygu0d in the absence of air resistance. Make a statement concerqegy n4evw98uw+i q2e qx* k8vnf 803aning its acceleration.

  Suppose a skydiver jumps from a high-flyingcp;5rktg a 3e2hdqb3 / plane. What is her acceleration when she she reaches terminal vel3/23h5pgrq; kdc e tabocity?

  A ball is thrown vertically upward witi+d v 5hn2v7koevf,/p h a speed v. An identical second ball is thrown kifv5d,7 ev/nhp ov2+ 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 higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One second later, asm2 olpan/*,ball B is dropped from the same building. As time progresses, the distance be ol2sap,na*m/tween them

  Ball A is dropped from the top of a building. One secona g qnub p -/pp1i:acg9gr27m+7 lyg1fd later, ball B is dropped from the same building. As time pr7n/1 upbggpac y i+ a1g p:lfmrg-7q92ogresses, the difference in their speeds

  Two objects are thrown from the tpf1usrs+;lb;.b8 un cop of a tall building. One is thrown up, and the other is thrown do;8nbrfsp1 lsuuc; .b+wn, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thrown straign 954a qiub jy-,xjo; n/kgin-ht down from 4ijoxyq-ij,a u/k bnng- 9n 5;the same 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. );ey)4+ ndr h7 mhgki7, cdutwThe position versus timeh7 + ,)rntdk)h47m ucw gde;iy graph of this object is

  An object is moving with constant non-zero acceleratio+qpcv(m14jg;q9vz j* 95hu usw;dutyn in the +x axis. The position ve9u4p j wvc9*1; 5;dg +quvmtq(hsyu zjrsus time graph of this object is

  An object is moving with constant non-zero velocif1upqnr9 l+d v7xi02zty in the +x axis. The velocity 9 f1xnl u2qz7+d ip0vrversus time graph of this object is

  An object is moving with constant non-zero acceleration in the +x a+rw*temmbaa-q +(* 7xo0s f* ozwp vi/xis. The velocity versus time gr wo-bit +/m* a7aveof0+*sq*rzp wxm(aph of this object is

  The slope of a position versus time graph giveqae1fh4 w7f 3os

  The slope of a velocity versus j3uleuq;onj7+ k+w ,6ezxc*q time graph gives

  The area under a curve in an accelerat wg2vhn:i3fumw *)b;aion versus time graph gives

  The area under a curve in a velocity versus time graph given kcll+ 8.r)-:xz( aoymx,djws

  If the position versus time graph of an obl 0+p22nj cruh khv .-a0gf6skject is a horizontal line, the object iakvl2 pu+6-hc k0 h0g jfsr2.ns

  If the position versus time graph of an object is a vert3xite 3gp:c3j ical line, the object ist:3xe3pj ic3 g

  If the velocity versus tiwxivdmz;led-;n0 we 0p(nl74me graph of an object is a horizontal line, the object inpdei7vz-0wm lwl de x4(;;n0s

  If the velocity versus time graph of a8wxuyhob8:hm h +kqb;n po(*+n object is a straight line making an angle omq nu* ohpokhbh(yb+w8+8 x: ;f 30 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0b+m na hiwwjk;(9 6qm5 m south. Find both the distance traveled and the magnitude ofajkw(;n9 h65+wmbmqi the displacement vector.

  A boat can move at 30 km/h in stiqb;vnub1n6 l8-q/ q (gy moq7lll water. How long will it take to move 12 km upstream/n6 lbub-y7 qnq 1;vo qqmg(l8 in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 16t.j r nlzq.1f-09 m)

  What must be your average speed au,5 zgxv1 aeit f +:ocd).qv6in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approxif7) bxb3pv -pyo7ju :amately 42.0 km) in 2 hours and 57 min. What is the averaxpv uy-7p ba7j3bo:f)ge speed of the runner in m/s?

  A car travels 90 km/h. How long k2 s9xzqw 6 8:9xpcce: sknyh,does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in b+b-q4b;+t d6yh midoone year. The speed of ligd4bbhm6 by ;toi-dq ++ht 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 straighaekjc7 1e ; r0-k,kz-arj8br-0os1 pgvdq p, yt road and you look to the side for 4.0 s, how far dsjakdrq -jg0 -yk8 zapo,0e7e b-p, rrk; 1v1co you travel during this inattentive period?

  If you run a complete loop around an outdpuv 0cz4+a o4zoor track (400 m), in 100 s, your average veloci+pa zc u4ovz40ty is

  A polar bear starts at the North Pole. It travels 1., n dko2r)fx- xfh l)r)e)z6dq0 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 the bear's average spr), r x-2z)oxdf)he 6klqdf) need?

  A polar bear starts at the Nor iu4g9xin2s,wth 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 startg2x i,94nsw iuing point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from scho uy/ oqu*a,m3ed64rmr mg:hs me y;w-5ol at 55 mi/h for 110 miles. It then starts to snow 45a y memd6 hr, /uqyo*3e:-ms;wm rguand 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 80 km/h a (p x2v kmc5,89.)x8 eafdw 4glghezucnd 160 km at 100 km/h. What is the average s)cx5 88dg9a p4hel2w,e kzv(ucxg m.fpeed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her av :hr0l52,kipeq-ns j verage speed for the triprlq,sh ik:0 2ejv np5-?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h qin/5 wlo r/pq6zs 58vy)q4e mnorth for 750 miles. W 4io/5n 5 qmlq qe8r)vwyszp/6hat is the average speed for the trip?

  In a 400-m relay race the anchorman (the person-a, r5.i.zphm b o6frf 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 runner not lose the h6o .fp,m rza-.ir5bf race?

  A car decelerates uniformly and comes toje8a 5: w+xavj a stop after 13 s. The car's average velocity du+javw:xj 58 earing deceleration was 76 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 averkhf-61efk5w zn g2qk ;age rate of qzn162gf-ekkhk w5f;$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ratl-p,dofl:t1 be 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 accelerates at fc5 mi z.3:lwq$4.0 \; m/s^2$ 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 hbbatxmdwi 0/ytf)-r bs) 01-m/s for 10 s. It then speeds up with a constant acceleration mtbi-d-/fbabt0 ) h wy 0s)r1xof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initiall mg5y1*jg8 bo velocity of 3.7 m/s experiences a constant acceleration of5mj*l1 oy 8ggb $1.5 \; m/s^2$. What is the cart's displacement during the first 5.5 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed h uahinv(a2yd1qf w9a/n7k59 of 389 m/s strikes a sandbag i9nfw7a5hakda( n/y1v h uq29and penetrates a distance of 63.96 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched fro92rl 7a85rkx yly1pqwm 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. Assumyqp a81xk5w9 lr27rlying the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with co hya2wuq ;0f c(7ayp0onstant 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 distabw+d(pj idzp t-t+.4xnce of 200 m. What is its average acce-p4tpd(tb+dwi+ j xz.leration?

  An object starts from rest and undergoes uniform acceleration. During the first2ujy p,v(owic h4q(,k second yhu pv2(j,i,o (qc k4wit travels 7.6 m. How far will it travel during the third second?

  An object is moving in a straight line with constant a5,nc 4p d3acqhcceleration. Initially it is traveling at 16 m/s.ncd3hca 5,p4q 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 uniform0ppkhcst6 0, cimd49qly 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 fkhvx 4js+e0-k,nr(hec3y6n 1 fz95kx ls7 mrdry 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 g;pdvpmyw:2eot648 ,jn en b9been waiting at the intersection starts ahead with82egnbn4 6wd yvoj:t,;mp9p e a constant acceleration 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 gj(ovs 9:bjjuu(c(* ssurface of planet X where the acceleration due to *j c:sb(((j9sjugouv 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 s e/rk2d u 9l; jqk.wsdzy8x(i(urface of planet X where the acceleration due to grav9lwxuyir(;d 8 ekd 2jk/q.z (sity 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 ai/t3x9 +v s8 m zyp,g(zzy)o;ffxmxv5 speed of 15 m/s on the surface of planet X where the8yz ,mp szxx)vo/ m( t59izfxfy3 +vg; 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 wi8hy,aw yf- pf3th a speed of 14 m/s on the surface of planet X where the acceleration due to gravity ia3p , -yhfy8wfs $3.5 \; m/s^2$. 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 a +b46lmda d 94 ulpqt1truler between your fingers and releases it without war ml4tql6u +bd49 adp1tning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.dedrv:rpg: .1(lk -vhymu (o+6 m/s. What is its velocity after 3.(u:(p-k: edly +v1vhrm og rd.00 s?

  A bullet shot straight up retu3gu 9d5n6.m/yd lz8 j3fdftehrns to its starting point in 10 s. What is the initf d9d3 3ghznd.f6l5m8 u/yjt eial speed of the bullet?

  A ball is thrown stratd/b6 wg7gz2 x )iqxh+ isp)w0ight up with a speed of 36.0 m/s. How long does it take to return to its s xdwwhig7+ )i/sbq) x t0z6gp2tarting point?

  A ball is thrown downward from the top of a building with ad /:vvg4tjc lhy*qpli9c(ws+f:qdju;55k8hn initial speed of 27 m/s. It strikes the ground afttq l u:4wsv(*jg5cqh8jhl;i:/df +9pd v5y c ker 3.8 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/nv;eo4s)(1gcz q-j y ms. (only fill in numerical value in t4)qjg;(mec1y zon -vshe 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 jl 5a.btdduduu;0o 89a speed of 41.4 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 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 lg9qrz7g dnj+oz-23l velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t = 2 q* 7xhfrxza+0.5 s?

  In Fig. below, what is/ )f+ c;vrjhgk the velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5zac v+rg,)dp faqc(2aczwe)- 8hj* q5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 jwa47dgt,o lrpm/g p:h)0,ss s?

  In Fig. below, what is the average velocity from 0/asv:j0/1z xdv vq+d)x.mscy to 6.0 s?

  In Fig. below, what is tvygk9;-(o ) zbqrrjq5he acceleration at 1.0 s?

  In Fig. below, what is the acceleration 4tikh1 9poe0xat 3.0 s?

  In Fig. below, what is the average accelxm6 d,ppsfsn2 :( xcgue6 7az:eration from 0 to 5.0 s?

  In Fig. below, what is the av-2 dmjvkqw8 .,;zv qnoerage acceleration from 0 to 8.0 s?

  In Fig. below, what is the displackz*xz -2 uiq.fement from 0 to 8.0 s?

Does a car speedometer measure s:q ;;1gi*rpodgq tj3 zpeed, velocity? {speed|velocity}

  An object can have a varying speed if its veloca/ousj 4y3;p fity is constant.

  The velocity of an object can be negative when its acceleration is positiecc / .eb-iso9ny a:c,ve.

  If one object has a greater speed than a second object, the first must had*:no.zlqr2 wve a greater acceleration.znlqd* r w:o.2

  Two cars emerge side by side from a tunnel. Car A is trav9u 6 0rab64zdwjb1hty eling 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 decreases. p+fm9 3ykkr9mm+++qe:k zkyexts:.a

  A baseball player hits a foul ball straight 1vl u ki7q2v3pup into the air. It leaves the bat with a speedilq1p v7 v3k2u 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 x 1y/mwb3f2lgobject speeds up, what is happening to its acceleration, how does i1gy/3fbw 2ml xt change if air friction is ignored?

  As a freely falling object speeds up, what is happening to its accelerati(k3kfc.lgo4 bon, how does it chan.(fblogkck 43ge if air friction CAN NOT be ignored?

  An object that is th8 0hyyygxgwiyj* 7+h6cg o95 a1krpg,rown vertically upward will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistan5+7y0ghg 1y kxa,i jghr8*coy6w9pg y ce is appreciable, how will this result be altered?

  An object can have zero velol,gloxwr v+, pl*j- v.city and nonzero acceleration at the same time.

  An object can have nonzero velocity 5u7gu huscflv)cf/qm+34 9ms)1n .y nnwa(a tand zero acceleration at the same time.

  An elevator moving from the second floor to the fifth fls29kfg 5woi 6 7fio**r7jg(m(jvfgzmoor making no stops along the waf7sk95i2fg(ir* ojgjgzwo (mvf7 6*my has zero acceleration all the time.

  A rolling ball moves fromb t0ze; iopr+:ak0lg: $x_1=1.7 \mathrm{~cm}$ to $x_2=-7.7 \mathrm{~cm}$ during the time from $t_1=2.0 \mathrm{~s}$ to $t_2=5.0 \mathrm{~s}$. 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 $x_1=2.0 \mathrm{~cm}$ and at $t_2=3.0 \mathrm{~s}$ is at $x_2=7.9 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps ar6gwpv/9gts+w iy2n w1ound a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.0 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 108g,xfbi/+o *jf qc jic4 zp4vkyb 8*u:3 m away in 9.6 s. It then tk gz,j4:vx/8f c4j biy3+ufc*io qp*burns abruptly and gallops halfway back in 4.8 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 fraauae.01/ud vof5qg )g i8 gv,om $11 \; m/s$ 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 frozga(4bq hh (8gyz yd/*m $17 \; m/s$ to rest in a distance of 82 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must re)ur.h uo-2)dmqq*cjnvbzm6 rgm 3m53ach a speed of $25 \; m/s$ 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 2s3ge+9gnh pz2zb5 qycan burst out of the blocks to essentially top speed aboutz+25q g3gehznb9s2y p $10.8 \; m/s$ in the first 11.2 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 fr.p1 cjt8h: w1prw-or8 shhwf;om a speed of $18 \; m/s$ to rest in 5.75 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 aevgc7 9:p bt6vo518cpq6zlo on the highway. Assuming a deceleration ogp o:8c z9a 1b7vt vqco56e6lpf $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tr: *of fii.ew1pc0lzzw+77dj d uck 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).    $m$