Suppose that an object travels from one poioz k* gbvt86;ont in space to another. Make a comparison between the dispbktz o* 6ov8g;lacement and the distance traveled.

  When is the average velocity of an object equal to the icc(dd 0yfw p7 q*;dy7*kwy,smnstantaneous velocity?

  A new car manufacturer advertises tha xl0o1..pdy+ar40cv8sd sy x asmn6k.t their car can go "from zero to sixty in 8 s". This is an+l camo68vyx ds dxr0s1s4k. 0.ap.y description of

  An object moving in the +x a5g k.4*xmikxqgwfh9p-( d 1 (y6xn bgsxis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x 8h w-8wqjrk8 9q6novqdirection) begins to slow down as it approaches a traffic light. Make a statement concerning its accejrkw6n9 8vo88q- qhq wleration.

  Suppose that a car traveling to theqm,;glii8v cid -c6k7kqfm2mz ih7 (- West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its k;i6li8i-c7 im vf(qm-kmzq chd7,g2acceleration.

  Suppose that an object is moving with a constant velocity. Make a statexacf miv6(95- gss e7gment concerning i 76-sg5exicm( gaf9sv ts acceleration.

  If the velocity of an object is zero, does it mean t,l4at0*os.kob ,dxg qhat the acceleration is zero? Support your answer with an exaqax k 0*s4d ,boo,gtl.mple.

  Can an object's velocity change direction when its acceleration i)i-0l*rbv :h) ujfwvws constant? Support0fijr:bu )hvl) - vw*w your answer with an example.

  Suppose that an object is moving with constant acceleration. Make a stateme jdnvkk(yrh6l8 bec7o39v: 4dnt concerning b(:okdh 6lr48kvej7 vny3c9d its motion with respect to time.

  Can an object have increasing speed while i 7e5vpve-mvwn m g wjxtw58vw* uwcx.b5*)2h+ ts acceleration is decreasing? Support your answer witt 5p-7e emv**w.28 u)h5vnmv+ wwgcwx xv5bjwh an example.

  Suppose a can, after an initial kick, moves up along a smov i-,,sjc zny-6ow+ iooth hill of ice. Make a statement concerning its accelerivsi+cy ,o--z6 n jo,wation.

  Under what condition is average velog4/3 rf 0saty/upr 5kh8a4gj mcity equal to the average of the object's init5gt 40sghkm/u4ra j3 rfyp8/aial and final velocity?

  Objects A and B both start at rest.zjnxngnri0c im,0y2 5o4r a3+ They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A czi+04oyinr a,m 2 xcrn503gnjompared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same racrb3my41 xa3 ote. However,c41m a 3orybx3 object 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 fallpz0s+ hh5qb9+pahq -d0 9kzlfs in the absence of friction, which of the f qk9l+h-d b 0ashz0+hpzf59 qpollowing is true concerning its motion?

  When an object is released from rest and falls in the absence of fric/i9/4nk p oq xh)xz,jrtion, which of the following is true concei/xprj/n9,4qk h)xz orning its motion?

  Suppose a ball is thrown straight up. Make a statement about ta*03bo2c co2r ttmj-1ap8pf yhe velocity and the acceleration when the ball reaches the highest po 3j8 2pbtar a02oy1om*p ct-fcint.

  Suppose a ball is thrown straight up. What is its acceleration just before it3 ;1a/czjqw 3qji di;a reaches its highest pointdw jia3zc;q;a ij/3q1?

  Suppose a ball is thrown straight up, reaches ulkc3z t(h- r7 u1-bjrt;mn9 ja maximum height, then falls to its initial height. Make a statement about the direction of the velocityhr m 9jzu3cbkjt --(u1rt;n l7 and acceleration as the ball is going up.

  A ball is thrown straighth6cky4l7a /t3gxa 9k n up, reaches a maximum height, then falls to its initial heigh7 c/9katyxk4na 3hgl6t. Make a statement 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 resis :r l,lu8vnea18i t4cetance. Make a statement conilr8t vu8,n4lceae1 : cerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. jyfh u 2g-)qt8 What is her acceleration when 2 j )th8fqugy-she she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical seco54kx/zb;9o- zf9m(n(4dwdse 7qfh zuvw : ratnd ball is thrown upward wit svqd-zta/rdk;e mwf(7h9z5 f4zw4x:(o9bu n h 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 buil6a vpj k7(oh1)cgd)epding. One second later, ball B is dropped from the same building. As time progresses, the distance between thec)p(1vjgek oap 7 h6d)m

  Ball A is dropped from the top of a building. One second later, ball bqk7(3 2smyay0q bf0oB is dropped from the same building. As time progresses, th0f 02(ybkq7q msbo3ay e difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown unjjf /0mek1 *a,, albtp, and the other is thr ,/emakt,1flj* n aj0bown 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 building. A secon udpk9e9hkbi vv;4a4 (d brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the acceleratb akkv (h4i9uv9d4e; pions of the two bricks.

  An object is moving with constant non-zero veloo9;r9d f 1xcuze;ybm 2in-yn2 city in the +x axis. The position versus time graf iu b1 ;enox 92;dn2zmcy-y9rph of this object is

  An object is moving with constant non-zero aekl+a w-jb17dzb9)la 75 ydpicceleration in the +x axis. The position versus timp1lik79ab75e- w d a+)l dbjzye graph of this object is

  An object is moving with const*4 w2j1hcunq yant non-zero velocity in the +x axis. The velocity versus tiuyn42qw 1 *hcjme graph of this object is

  An object is moving with constant non-zero acceleration in the +x aa 84krg2syw7ppe-8 gh xis. The vel shrpwge7g8ay -p2k 84ocity versus time graph of this object is

  The slope of a position versus time graphr ,f fv-i6y5gp gives

  The slope of a velocity versus time graphv,(e/wl1z 6qe at rky6 b0bwf2 gives

  The area under a curve in an ace9-5 fjm6mhb bceleration versus time graph gives

  The area under a curve in a velocity versusy42y (+y uccvm time graph gives

  If the position versus time graph of an object is tljn;wvlcsj9 7)m6s ,(z * pd5zp6ydca horizontal line, the object isdvc7zscltyp)m 66nj j;,w9 zsp* d5( l

  If the position versus time graph of an object is a vertical line, the object isguc go blj89s4 - wm4wi(c rwfj52j;;eu;84g ccwor (i4; w 52fsb jmw9g-ejjl

  If the velocity versus time graph of an object is a horieq.1s5l4h;(w 5oz1ytzn i fr xzontal line, the object i seifwntrq11 ;h.4( zoy55xlz s

  If the velocity versus time graph of k,gj(we-s+p (a)ga3c zfw gv 9an object is a straight line making an angle of 39k3g pj w)+,(ec-as(f gwa zvg0 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the dis ws:*5qtq0aq jtance traveled and the magnitude of the displacement vector.q5 sa0*j:wqqt

  A boat can move at 30 km/h in still water. l uxjgbi)t; pon 8 0kf8.(bca; How long will it take to move 12 km upstream in a rivbj8)p 8gx.ilt a;o k;(ncb 0fuer flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 h-t6jlj f ttcw4c l,)(mi = 1609 m)

  What must be your average spi a1h2+z/b0ttlqt*r m eed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 482l9k wlc mfj*2.0 km) in 2 hours and 57 min. What is the average speed of the runner in m/swc8kj ll*9fm2?

  A car travels 90 km/h. How long does it take for it mf0x+ 45rhyv,.dd ouy to travel 400 km?

  A ly (light year) is the distance .n1c4ghr u5 owthat light travels in one year. The speed of light io.5hc4 1 gnrwus $3.00 \times 10^8 \; m/s$. 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 r zu6m /uu.lv25 nrjz:eoad and you look to the side for 4.0 5ml2u:6e.urjznv u/z s, how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your kras:lpp 3. a5averag :ar.5ppa lk3se velocity is

  A polar bear starts at the North Pole. It travels 1.0 keiu(9c(kua6 8b cwj t 77,vezsm south, then 1.0 km east, then 1.0 km norscjvb(97(wuc , a68teekuz i7th, 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 Nq x/zakgjd 7:v9f6jz0 orth Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km n/gfa z 6:0zjd7xqv 9jkorth, 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 11 y+j y(vhxa.f10 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes.f.+yh 1jva (yx 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 u0jo1l +qrjp 9the average speed of the motorist for this9pjul+10r j qo trip?

  A motorist travels for 3.0 m1 o-gmdbr 7.a x wvp,73gv7ujh at 80 km/h and 2.0 h at 100 km/h. What is her average speed for t jgm.mb7v arx u71 wvp,god37-he trip?

  An airplane travels at 300 mi/h south az 7imz262t6urg*6i 2oocy befor 2.00 h and then at 250 mi/h north for 750 miles. What is the average s omio r6czigzy 2te6*6722ab upeed for the trip?

  In a 400-m relay race the anchorman (the persomkcf84w3 nyhu-y7pedx;/ /mx n 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 loseu3y 7- hm pyxd/fkwmc ;84xn/e the race?

  A car decelerates uniformly and comes to a st jz 3oqa):wf)lop after 14 s. The car's average velocity during deceleration was 79 km/h. What was the car's deceleration whil:lzfw)ja 3qo)e slowing down?

  An airplane increases its speed from 100 m/s to 160 dw a,4nhn8q0z m/s, at the average rate of ,nn04da8whzq $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceleral nnlrjw)qb9v 8ol-;*tes 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 and accelergu kcbv.44x+ vt 1 1)hkdvek,aates 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 th94yq djeulnfx:v52(cv+n fc 5d zb /jbm4f q21en speeds up with a constant acceleration of clj5m+ x1vffbudj/de4bq 45 9: qn2zvc f(y2n $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 6.8 m/s ,eq/u 9c ihn(9icm-a by6ka9nexperiences a constant acceleration of99(n-i nac/eybkqumi ,h6 c9 a $2.3 \; m/s^2$. What is the cart's displacement during the first 8.6 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 384 qo6fm at 4fu3g0vy+g pq8k:f3m/s strikes a sandbag and penetrates a distance of 72.32 vkq 4ff+m gq u tpg63:8o0ya3fcm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrildgr.+ r4tko3n :q+4o +quu wmswl49f er. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the accel gql wur+ ks.3r9:4 ofudw+mt4oqln+ 4eration is constant, what is the length of the catapult?

  A car starting from rest moves with /ljlvv7(h 12orzr pga1id-5q 6yr1qiconstant 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 of 200 .wj9gfj6fit,;oko1bo/ o0k k9 3tdw rm. What is its average accew 9,ko.dj9wt ;bf6f i0rtj/oo 31ogkkleration?

  An object starts from rest and undergoes ug.mp v;j bunxg/+1aq1to v j;,niform acceleration. During the first second it travels 4.6 m. How far will it travel during the third seconggb.u1x ;1vv+t nq/, mpj; jaod?

  An object is moving in a straight line with co i+kgxlbg )/l .iusx 59afl12k:j7x aonstant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 1a k+gl o: 7xlxs)iau g.fk9x/ljbi15 20 m/s. How far does it move during this time?

  A car starts from rest and acceleratesg6fit:2zea/py2 j 2sl 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 decelerat0je kovd z bfl*)x9:w*2kl.wne 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 beenmq 5ul8duh8:+ dcli4t waiting at the intersection starts ahead with a constant acmhluqd ct5d:i+84ul 8 celeration 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 yy0qnx.)x2070+v,fpb lavzw4 sajy n upward with a speed of 12 m/s on the surface of planet X where the accelerationxbvaln y vyw0y p.ja4n,70z2+xq 0s) f due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upwau,;mjv 1+ xz7 g:w8oke bfogi(rd with a speed of 12 m/s on the surface of planet X where the accexo: og1z uwk,7 e8+f;i(gm jvbleration 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 up0g d.ss1bs3 xek5-mwl ward with a speed of 15 m/s on the surface of planet X where the acceleration due to 0x1s5sems .bwdlg3- k 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 surp72zsmlg0nz n; 6hp k6utpggz1600lzface of planet X where the acceleratiog 670zhnuz 12p0ntpzpgm l 0kzl;66s gn 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 yo :1q0ei eqx4b-;4t sw-xk g 6vufkrfp2ur friend holds a ruler between 1 u qxxp-ikef6b4f4 t0wg2kver- q;s: 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 velocity aftbio -by4:u-(f qfeqj.uc(nu 7 er 3.00 sub-.4qu(ejc7f:qf(in uoyb- ?

  A bullet shot straight up returns to its 75+cxti,vpm ystarting point in 19 s. What is the initial speed of the bullec7pyi vm+ x,t5t?

  A ball is thrown straight up bb d6:hma0 pu 2 a*5lwgisy/b3with a speed of 36.0 m/s. How long does it take to return to its starting poi0p62d*by wb: uhmsi/5b lag 3ant?

  A ball is thrown downward from the top of a builp+* p.lu)vjs jding with an initial speed of 28 m/s. It strikes the ground a sv*ulpjpj+.) fter 2.1 s. How high is the building?

  A ball is thrown str3lhu6i ;mb 1raaight up with a speed of 30 m/s. (only fill in numerical value i63bulhmria1 ; n the 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 a speed of 47)fv /m)/lvkvt d4v .nl.2 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 6 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 6.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velockxts v q1c9l6,ity at t = 1.0 s?

  In Fig. below, what is the velocity at t = );y7zzbbvahd u),g* v2.5 s?

  In Fig. below, what is the velocity at t snjp 3/hur+cn79gkv; = 4.0 s?

  In Fig. below, what is the velk ryj7 n(ataye t21n29ocity at t = 5.5 s?

  In Fig. below, what is the average velocity f 0*j (b 2z8lu lpj,;czvdjspa0rom 0 to 4.0 s?

  In Fig. below, what is cf q0th-v5tg1 the average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0n /p)jfdiy7r z7izl204t3 kfz s?

  In Fig. below, what is the accelera+8q/)g7 pn-bhc fmt dgtion at 3.0 s?

  In Fig. below, what is the average acceleration from iwntubo l3.;7-x,spu 0 to 5.0 s?

  In Fig. below, what is the averagv3p :)nhi,p1ur-nlo( o2) ohbhr.q zpe acceleration from 0 to 8.0 s?

  In Fig. below, what is the displaceme b: /q6kj4 v b03uxdxdd;hz:nknt from 0 to 8.0 s?

Does a car speedometer measure5y+)acy.).zl 7nmrqrc/ bk y m speed, velocity? {speed|velocity}

  An object can have a varying speed if itshz x+. vt+nl0e velocity is constant.

  The velocity of an object can be negatim/yh0ywbwjt,:,bv w2ve when its acceleration is positive.

  If one object has a greater speed than a w6k ;f(d*dcaj second object, the first must have a greater acceleration. a*cd6;kfdwj(

  Two cars emerge side by side from a tunnel. Car A is traveling wityiw ayf a-0/h4vyx:2mqa0*l mh 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 decrkd:4zqx dx8 tu+k sh+1eases.

  A baseball player hits a foul ball v)b)4e om,ge b(k4sco straight up into the air. It leaves the bat with a speeb( o)e4skb4gmv coe), d 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 a nq2bw n,hgqp(l92,m :o/e2vvjsb lw 2cceleration, how does it change if air fricti 9(n 22sbnqe /l,vg2mjb2p, hwqo:wvl on is ignored?

  As a freely falling object speeds up, what l clgs)0+wnr6 is happening to its acceleration, how dgcr6 sl +w0nl)oes it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original position e7 77 /h ygzvjta;wg3bwith the same speed as it had initially if air re w7y7; evtz 7a/3hgbjgsistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzer h8 w,50rn*wk5aue9bv xynt -eo acceleration at the same time.

  An object can have nonzero velocity and zero acceleration-b5r3akt;u ej at the same time.

  An elevator moving fr,ks ivx)*y) ewom the second floor to the fifth floor making no stops along the way has zero acceleration all the time.*kse)iyxv, )w

  A rolling ball movesrxk:ahi3 (gu-pfx-ij(-r2 ycx 1i*- no5 scfx from $x_1=2.5 \mathrm{~cm}$ to $x_2=-7.4 \mathrm{~cm}$ during the time from $t_1=1.3 \mathrm{~s}$ 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 $t_1=-2.9 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=4.2 \mathrm{~s}$ is at $x_2=8.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight id2.m 8kc3is :u v8y3b jans0vcomplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.1 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainer 07yebzotm18e in a straight line, moving 107 m away in 13.0 s. It then turns abruptly and galloto8eb0z e7m1y ps 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 from 7/vpv:d/v 71iiw nw9j 0 lkztg$10 \; m/s$ to $24 \; m/s$ in 5.1 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 fro0dou91hw : pl./i rnjh78ajwrvy du//m $23 \; m/s$ 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 spepct imy/./k1l ed 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 d5,.u-iz qdbf keo7)wout of the blocks to essentially top speed about 5ifde -w)bd,ok7.quz$10.4 \; m/s$ in the first 11.5 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 aepwty-mjp fh/8 5;54o c fmv)k speed of $16 \; m/s$ to rest in 5.58 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. As l2z85,5so asxuu y)cjsuming as yzuo l25cx5 ,a)8sju deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goinjk qqb ty.9tv:7o-v;uy-j xki l*,qu-g $25 \; m/s$ 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 cok)729pzi mzgg.drul+* ay3 fbmplete the 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The zl7fk* bu.md+ y39r 2zggaip)runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$