Suppose that an object travels fros+-- b:7h6x uypvmhngj9nw5 tm one point in space to another. Make a comparison between the displacement and the d6j -s9 vxnph umn 75t+yb:-hgwistance traveled.

  When is the average velocity of an object equal to the instantaeis12fs (kos iw)7hm 1neous velocity?

  A new car manufacturer advertises that their car r6(y iil aef,8evarp6w v3c.,can go "from zero to sixty in 8 s". This is a description ore8va lv ,(yipe.ai3fr6wc 6,f

  An object moving in the +x axaedj,3ea(z- g po* +vzis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the E1g *w(a2pm 9 hy(rhhjbast (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acce*(phwym gbjh21( h9arleration.

  Suppose that a car traveling to the West (+7au0 rlj lr 8bd:ttq(-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its accelerati:uqr+lar0(b8 l7j dtt on.

  Suppose that an object is moving with a 69t .xef4e bx l)l/eq5lny6(wh +y scbconstant velocity. Make a statement concerning its alyyesfx./6q9hel)456+ c bnt l bewx(cceleration.

  If the velocity of an object is zero, does it mean that the acceleration is zeroumfe 0 +zml:29x oc 0a-oykb74nap0u g? Support0ol04ogze02mux7ub+a:9- pny fkcm a your answer with an example.

  Can an object's velocity change direction wheom ywpu/i3fyzxw6;l9bs9 r / q9g06sytp-*g un its acceleration is constant? Support your answer with -9s*gos piy/w0rx;3ubtlu 6 w/qmz69gfyy9pan example.

  Suppose that an object is moving with constant accele) e,gqd+ * dnvpn9j1hahb;30l7g alquration. Make a statement concerning its motion with respect to tim q1+0n3g9aln; p *jbh) hdeauq7gld,ve.

  Can an object have inctjfp p5)+.uum8g 2e(s wzpt(zreasing speed while its acceleration is decreasing? Support js.et( 2ug8f()zuppt5wzm+ p your answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ic:gnxcp;5ro iak 8b24c as e4-ce. Make a statemen 4caa; 2nrixgb8-e c ks:4poc5t concerning its acceleration.

  Under what conditionaot13tl 2(m bo is average velocity equal to the average of the object's initial and final velocity?t 2t1(bl amo3o

  Objects A and B both-vw l /9ok uu7r7gnyx;zl u1w3 start at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed7ww7 ;ovuznr9uuk 3xlg1-ly/ of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the 0wee,gfwk ef+oe -+ qlh3*9hnu d99ilsame rate. However, object A accelerates for twi0k wn *+l 3h dhe+u,f9lw-9i9eeegofq ce 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 02sxt q qf;tcld(btc ;1n9t4nthe absence of friction, which90bf4tnttc( 2qn;tcq x1; sdl of the following is true concerning its motion?

  When an object is released frotqydcdw8 x25 )m rest and falls in the absence of friction, which of the following is true concerningw 5 d)t2qy8xcd its motion?

  Suppose a ball is thrown straight up. Make a mg1 ro ., lk9fa(sj/je ih569u3zvgnrstatement about the velocity and the accelera(, .5 zvnsi9 ja19refjruk 6g 3goml/htion when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is it)r0 rz6ev6 v*dln.q mks acceleration just before it reaches its highest rl rvm).d0e66z kn*v qpoint?

  Suppose a ball is thrown straight up, reaches a .0 sen rmmi;y)maximum height, then falls to its 0;y eimrs).nm initial 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 ig v puq;;:3we ucoe)5lnitial height. Make a statement about the direction of the velocity and acceleration as the b)cgl :3w5 uueq;epvo; all is coming down.

  Suppose a ball is thrown downward in the abse7x3dvsf bex 3 t* nss-7yn(pl:nce of air resistance. Make a statement concerning its acceleratiov3tb7 lsxn 7es*d-xf3p(syn:n.

  Suppose a skydiver jumps from a high-flying plane. What /tzpydixshr90*7d,du+p 0uiis her acceleration when she she reaches terpt iid rsh ,x0d/z* u+079uypdminal velocity?

  A ball is thrown vertically upward with a speed v. An idei6 cje5ee8ag+x5 azs05vow. intical second ball is thrown upward with aaso je6558+ce. aex05w zigiv 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, ball B is ds1yn m+6bc*ni ropped from the same building. As time progresses, the distancesicn61 n+ *bym between them

  Ball A is dropped from the top of a buildin jb9em0.d *au /xcnhc:g. One second later, ball B is dropped from the same building.c:u.nbjh0 /c*9da mx e As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall bu*ugg6 +i dw 5js3qt;yuilding. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds wh6 5sqyj+giwu*ugdt3;en they hit the street?

  A brick is dropped from the top of a building.t)hx-e-ptnn pa +vtu3 wg r6p h/z.)n+ +mtm+i A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the tg +-evip)nr +.3/m)mnutt ap zh-6xp +htt+wnwo bricks.

  An object is moving with constant non-zero vsqdt+lnr ;)aca ) 4u0 oprjm+;elocity in the +x axis. The position versus time graph of this ;)4u)rn0c om+ dtqpr+ ;l saajobject is

  An object is moving with conex/y bn5 ci*97lbxeq8stant non-zero acceleration in the +x axis. The position versus time graph of this objec xycn x9qe/8e*l5ibb7 t is

  An object is moving with constant non-zero velocity in the +x axis. The velo3af)/ ig )g3 yauukv2v7sg iq5city versus time graphq) f/2vi gvu57kiu)ag 3 s3yag of this object is

  An object is moving with mphh-*fe3 8 mmconstant non-zero acceleration in the +x axis. The velocity versm83hhef -m m*pus time graph of this object is

  The slope of a positio msrs 2yid8f0jmr6 *;+duaft+ n versus time graph gives

  The slope of a velocity versus time graph g0gb-e 6g) jhm0,zmygj ives

  The area under a curve in an acceleration vw*ie1vt2ub5sm ebk l+ok z;l7y9x *8iersus time graph gives

  The area under a curve in a velocit4ptnyd cd5a60 y versus time graph gives

  If the position versus time graph of anr d ejr.) 7ee+/dd5tlo object is a horizontal line, the object il )t d/7+5.jeredreo ds

  If the position versus time graph of an object is a vertical li47kii us )9ssdne, the object isus9i 4i7s)ks d

  If the velocity versus time graph of an object is a horizontal line, the o5 i:vnc/h wxv* mbsq; m,t8:asbject h:m :qmnsscvvba5/tw8,* ix;is

  If the velocity versus time graph of an object is a straight line making ayrg(j3qnr )y0 n angle of 30 degrees with the time axyy) g3r(0jnqr is, the object is

  An object moves 15.0 7jf ko trtlit3*9 o8dbplhi8 5b8kl( o(x3fx2 m north and then 11.0 m south. Find both the distance traveled and the o8*57r 92 xkof(b itxki 8j3tl tlp8bhdol( f3magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to moveu,b*k) 9p zdfy 12 km u d9buz,yk *pf)pstream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi k4(bo-qe a-f +;j1debd)v g wa6d*u)c2cadz x= 1609 m)

  What must be your average speed in order twknbydtm3v7 ouk;fg 17 *7)ufdda/b+ o travel 350 km in 5.15 h?

  A runner ran the marathon (apc pwbq9z -*am.1 gm.uxproximately 42.0 km) in 2 hours and 57 min. What is pgc-*mb a mzwu9qx 1..the average speed of the runner in m/s?

  A car travels 90 km/h.+;rg3 m fwmb0w How long does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in on6ealvm vcsen *a ,)6zttfi5yd6+1*q ce year. The speed of li d ,6i net5myz6aa+1 l) e*6sctfvq*vcght 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 straight road and 31ul2;pb asze d1n;(d fcqbv.a kuc: -you look to the side for 4.0 s, how far do you travel during uku db(2za an1cb-q31f:.; ec;dvplsthis inattentive period?

  If you run a complete loop around an outdoor track (2yb;bfi eo+y4yh t224 f hxdi7400 m), in 100 s, your average veloci+t42h22bix ffeyy 7bydi 4o;hty is

  A polar bear starts at the North Pole. It travels 1.0 km south,jnbp l kpuetly (67,41 then 1.0 km east, then 1.0 km north, then 1.0 km west to return to itsy4lbj ,lu(ppe7 k1n6t starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km 0q mujcy,x7 z,east, thz70j,uqmxc y,en 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 velocity?

  You are driving home on a weekend from school at 55 mi/hj ,4 9uwbe)rfu for 110 miles. It then starts ,wj4uf)9e rub to snow and 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 and 160 km at 100 km/h. What is the a4fjhha ;9y up-verage speed of the motori fuy;hph-j49 ast for this trip?

  A motorist travels for 3.0 hjlz k; /vif b-./mg5ih at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the trbzl/i/- mh5g. jikfv ;ip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/hvk uvi6z324k 0 zizg8y north for 750 miles. What is the average zzi 64uyk vk 3g2zv08ispeed for the trip?

  In a 400-m relay race the anchorman (the per2dv jxtj;/2on son 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 codj2tnv2/x j;over 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 race?

  A car decelerates uniformly and comes to a stop after 9 s. The car: *py;lyy ,wuo's average velocity during deceleration was 68 km/h. What wu:opl ywyy*;,as the car's deceleration while slowing down?

  An airplane increases its speedhsy+v5)cmn yydj,/ l:u/o6wv from 100 m/s to 160 m/s, at the average rate of m vv,su6c)y /5oyjhd+yn:lw/$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at cop+)lxh:koxw/ hm48 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 a jq:b, d746utba:pm eznd 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 accelekycd.fn,jp rho+.psgdx +/t k37 fw ):ration oft dn.,3cw7 +js./kyf ohpdx)r:+gpfk $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 5.9 m/s experiences a constant acceleratig2 ,u/ mrh ziyd 09q9qd+8vaiwon of yw 9dvi20 / ,zgm+hiqar8u9dq$4.8 \; m/s^2$. What is the cart's displacement during the first 8.5 s of its motion?

  A bullet moving horizontally to the right6a.k 6gpj5 at (iqyzzaim ;,,b (+x direction) with a speed of 314 m/s strikes a sandbag. q;,tijpa6y zba ,56za(gm ik and penetrates a distance of 37.61 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult /a) du4me6(y 5cub dtzon an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?mtdduey )u5z(ba/c 6 4

  A car starting from rest moves with constant acce ,.hmm wh r5pjka1j,g*leration 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 dis nu d(*mc0xcvn c8q/u-tance of 200 m. What is its average acceleration?un 0/c8dq -uc(xv cnm*

  An object starts from rest and undergoes uniform acceleration. During the firsj i/d bb(,*4cqsgth8st second it travels 1.6 m. 8bs(s/h* ,iq g4cdbjt How far will it travel during the third second?

  An object is moving in a d2bn f3t7a4 h l)8qwebdn2f-k straight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is travelibehd28)q4 a7b-2nk3 dw fnlft ng at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformly pkshats2di1 tj(y,2f5 mgn;.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 onptu(4hn7abpsbm :; l*x4z u,rm1h sn8 a dry 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 hastclln77m,qzq rz 1*h6 been waiting at the intersection starts ahead with a constant accen6l*l1hq,t7 z7qmr c zleration 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 oy;0jw: vwt;vnee* ue5 f planet X where the accelewe wnvvee5;ut0y:j*; ration due 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 surfacqc)/wg /idjh3me h +d+e of planet X where the acceleration du+ ed/)/h3widm+cj qghe 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 a speed of 15 m/s on the surface of planet X whehg9fclwp+ lx5uj/ cqp - l*v5+re t9llx+-p lh*f5+5 qcg jp vcuw/he 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 upwarob+e yk5q wu);d with a speed of 14 m/s on the surface of planet X where the acceleration due to gravity is)kqyo;e +5bwu $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0r ,yv wq0oq91;(sum k,z sx-wh.10 s. If your friend holds a ruler between your fingers and releases it without warnkswrmq( us1 h0,o;w-vq,x9 yzing, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity o9p 0cc ubeh-koai *e*1f 19.6 m/s. What is its velocity after 3.abe *- 0eco1h9pi*k uc00 s?

  A bullet shot straight up returns to its starting point in 18 s. What is t5e vr25lsc* ur vz1fp;he initial speed of the bullvvu *1ezr; c5rfsl52p et?

  A ball is thrown straight fo+v 6658 ri+gxomcxoup with a speed of 36.0 m/s. How long does it take to return+6 i fo r85xgcmxo+6ov to its starting point?

  A ball is thrown downward from the top of a building with an dr7.eq; xk9cmlbib4r:0l6a0 zp,xy ginitial speed of 18 m/s. It strikes the ground after 1.4 s. How highmxcy,4 0. bkg0l9 qexdlp;rib 7r6z:a is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fipt.f brx09(w1x 3cv;s3f uvjsll in numerical value in the blankxsbj.(0w3usx f1pf3crv;v t9 s)
(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 speed of 41.5 2xz8d)aj-s aghf5a c3 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 8 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 8.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the veloc +0y h h7qo0b)f6ynzyvity at t = 1.0 s?

  In Fig. below, what is the velocity at t = 2. ex1et+;c0w+j)a nilz5 s?

  In Fig. below, what is the velocity at t = oq8 fqagq23v54.0 s?

  In Fig. below, what is the velocity at t89 -hxqek ju3nmid 63e = 5.5 s?

  In Fig. below, what is the average velocity 2q re -vv1h 96dg/)rxxyizs8rfrom 0 to 4.0 s?

  In Fig. below, what ik.lj,6uz*g+3 vsmv nhy)mb1:a awc b3s the average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration3 ek9h4h h 5yu+(wehkb at 1.0 s?

  In Fig. below, what is ek( ,ap i:dqe5the acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from *hqj7 k ge7v lqmoq6(;0 to 5.0 s?

  In Fig. below, what is the aveqsbx-2u7n-,7sggg e dgi+bz /n 3ny(erage acceleration from 0 to 8.0 s?

  In Fig. below, what is the da ,(s5/ 4ciga1ng wlspisplacement from 0 to 8.0 s?

Does a car speedometb1r:r +gz*opfer measure speed, velocity? {speed|velocity}

  An object can have a varying 9w*wd dt w04w)ydb)xj speed if its velocity is constant.

  The velocity of an object can be negative wqp1nbx1:;8qcxbj3 wdfp rn64hen its acceleration is positive.

  If one object has a greater speed than a second object, the first must have a hjvasc1hi2v-m3 9) kolu3 -hzcl/im*greater acceleratiazv-) hiju 2ch3l *klm/h -i v1mo9c3son.

  Two cars emerge side by side from a tunnel. Car A is t q(y,+hmy b+pwraveling 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 accea3uw 93xkq7upp*+tqlleration decreases.

  A baseball player hits a fousq35q 9* y5 wmydja*apl ball straight up into the air. It leaves the bat wim5*qa pay5d *wy3qj9 sth 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 happening to its acce:ubl0k kugm +4leration, how does it change if air friction is ignored? g+ kb0luu4mk:

  As a freely falling object speeds up, what is happening to its acceleratioyedk 2um lvn /hsf,) )xwj6k:1n, how does it change if air friction CAN NOT be ignorewde/:m 1 s2kuh,jxny fv))kl6d?

  An object that is thrown vertically vjgk9m q3dm e(,/4synupward will return to its original position with the same speed as it had initially if air resistance i kn m,vje39sq g(ydm4/s negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity a)ol go ;,k,cprx8tj0hnd nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the i e5sy57w( f)gsukik.t6c*a j, 9 hzkisame time.

  An elevator moving from the si93ah/:qf50,zo(vatdl .pin) 6ki sh5 szpo b econd floor to the fifth floor making no stops alono , i:vz5/ s0 phii)nas6b 9p3z lhd.a5ko(qftg the way has zero acceleration all the time.

  A rolling ball moves fl7 voqc 8 0zzc0x;mux1rom $x_1=2.3 \mathrm{~cm}$ to $x_2=-4.6 \mathrm{~cm}$ during the time from $t_1=3.0 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.7 \mathrm{~s}$ is at $x_1=3.1 \mathrm{~cm}$ and at $t_2=3.5 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight cy( qukm32vao :omplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.9 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 whyav ci,;qzlv f-: td4cj0 .395 m away in 13.7 s. It then turns abruptly and gallops half.f-jqdwt:ch a v vy,i403 lzc;way back in 4.7 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 fromb5 hwuno- +yuq44s;eju36djo $12 \; m/s$ to $23 \; m/s$ in 5.7 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/)0h u z)3ihhpu 2wwg(2oltxf $23 \; m/s$ to rest in a distance of 75 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed 5b87hcbawlc te. 2td +of $29 \; m/s$ 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 essentialzm e sp;:+nplodg/ x+6ly top speed about sp:gld6z;e m+o+x/np $10.7 \; m/s$ in the first 10.7 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 speed of -v /hb45y6b tr /nommv$17 \; m/s$ to rest in 4.71 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 the highway. Assykp93zjh- , xb4pxp n2uming a den jp4zb9xppy-3x , hk2celeration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truc8d5iql:bw g 1jk 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).    $m$

  A runner hopes to complete the 10,000-m run in less than k6t k i+74xe-t.afneu30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner musti7.k 6 eft+- axte4nuk then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$