Suppose that an object travels from one point in space to another. x3wgyu(z, ed3u xzr- ;Make a comparison betw(ur,gwuez3zx3- y;xdeen the displacement and the distance traveled.

  When is the average velocity of an object equal to8i vma;5k 0vtl the instantaneous velocity?

  A new car manufacturer advertises that their car can go "froui(), +jcjj etm zero to sixty in 8 s". This is a description ctjujje)(i, +of

  An object moving in the +x axis expe /lqrluf(8wp3 riences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins tn by6k5emga9 f z8f.uxvt)1xws t5j08o slow down as it approaches z nux8t569wjy0e1fx.8f )5 bgatvksma traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow down as i m:sm3p v gxhtup8b 5k*;,r0xqt approaches a tr hpvs*bq:;g 8 m0pxmx, t5k3uraffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make um(edwl51u ,4az8g ok;/pqgr a statement concernd re1( ugzlgq/;,845o wmpakuing its acceleration.

  If the velocity of an object is zero, does it mean gq o7mpidvvv:7dy9g+zq)o(a2t* m h(that the acceleration is zero? Support your answer wita pmq7v(gg z(io:2o*h7 9vqt)ymdv+ d h an example.

  Can an object's veloc8i whfflm176q3qq 3ye ity change direction when its acceleration is constant? Support your answer with an eyq 68wq3fh i7f 3el1mqxample.

  Suppose that an object is moving with consta*jvgc lrsj155nt acceleration. Make a statement cv* 5cl1sjjg 5roncerning its motion with respect to time.

  Can an object have increasing speed whilr:;ft o rzn-m ;k9w-kwe its acceleration is decreasing? Support your answer wi;nf r :tw k-w9ro-kzm;th an example.

  Suppose a can, after an ini1( 95 i,zpuzggzr) qrunkt9 -ltial kick, moves up along a smooth hill of ice. Make a statement ( zrn9 gzu r )5tukl-,1zgq9piconcerning its acceleration.

  Under what condition is avikv)-47 fmai 2q d 1at2y+dew xe2/hhgerage velocity equal to the average of the object's initiag/x+ )w-2 hyd2t h1e kev4q72amdfiail and final velocity?

  Objects A and B both start at rest. ++xw5xiraor, 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 compareda+rxx5wr o +i, to that of object B?

  Objects A and B both start from rest. They both acc kmw)usq +6wrr2v;mp/elerate at the same rate. However, obj2+wm)p;v6 rms urw/kq ect 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 frikc/v xe-ywc33ction, which of the-3vw xy3c /kec following is true concerning its motion?

  When an object is released from rest and falls in the absence of friction,d z0ai .w*cu;eqd ks0d8y.+n w which of the following is true concerning its m sq 0i+.w*kwdudn;0 c.zdy8aeotion?

  Suppose a ball is thrown straight up. Make a statement about the 5 ),oa tlbp5lf e6ul,vvelocity and the acceleration when the ballef,blav56 )llu5op t, reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just b t p66s-2 sj6mopj/f zug8)ffxefore it reaches itstfopjugs s6 x jf8f/m62z 6)-p highest point?

  Suppose a ball is thrown straight up, reaches a maximum w w:/+ecsi6d b26skvmheight, then falls to its initial height. Make a wd2kbss:m+i/6 wc e6 vstatement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maxi5,pc 5rui51pmj +y+ ollrjsg4mum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleratic+4mr +51pgl5jiplo5 , jy ruson as the ball is coming down.

  Suppose a ball is thrown downward in the absen .s qz5b*thl(zce of air resistance. Make a statement concerning its accelb(l5s*tq z .zheration.

  Suppose a skydiver jumps from a high-flying planeqs7,1jo3 vo7u craha) j(uf s2. What is her acceleration when she she reaches terminal f)j u37,uvqc hs(o sar2aj o17velocity?

  A ball is thrown vertbyiz 0lwy/y- 9ae d e5es+d056uu7uftically upward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What iu05uy/ y tdb6 uwy0i5l7de9sz+ feae -s 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 topnv0:hw nx h9u+q8bfi4 of a building. One second later, ball B is dropped iwqh+4: unh9x f8nbv0 from the same building. As time progresses, the distance between them

  Ball A is dropped from dfme26b.jy*n.ku vq8 uw 6 /idq40h lhthe top of a building. One second later, ball B is droppeded.hy8q nb wj6 m/6l*uh q0id2. fuv4k from the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is ti(9j-pe+sirf7d h7tvhrown up, and the other is thrown down, both with the same initial speed. What are i+i(jtf dp-rhv 9e7s7 their speeds when they hit the street?

  A brick is dropped from the top of a building. A second br m9j:qttgikgbf: 4 a9d6v +,uyick is thrown straight down from the same +tkqivu 4a9j, :bgtgm y6fd:9building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with conf pf(qa5s02n *lo(slestant non-zero velocity in the +x axis. The positionlfqs5sn0apoe (lf(2 * versus time graph of this object is

  An object is moving with constant non-zero / izr/-gj,-u m jzje5bacceleration in the +x axis. The position versus time graph- zi /5jg-jb m/rujz,e of this object is

  An object is moving with conse f .t;ldpaqylc)8- 7htant non-zero velocity in the +x axis. The velocity versus timepfl)a cyqhdt.el8-;7 graph of this object is

  An object is moving with c++ wtlm lg,fklp:yu 0t3izt,5onstant non-zero acceleration in the +x axis. The velocity versus tti5fml3+lugz, l0 p:tw+,y ktime graph of this object is

  The slope of a position versus time graphur+e2t7 +gkbm,z3 , xo6hzkzp gives

  The slope of a velocity versus time n 9pvt ,xq8air.l,q0u ,ia:w ograph gives

  The area under a curvr:f:++9pb1e t7wlkbl x(kca be in an acceleration versus time graph gives

  The area under a curve in a velocity versus t/7vlnahxwc.0lr5 b.3c qtfiagq ;: 1dime graph gives

  If the position versus time graph of an object is a horizontal line, the obj3r6s17txj dtghc(y -y7)o,v iz:gcv rect 7 y3r)g7g1cx6s c iy, ov -:zhdtv(jrtis

  If the position versus time graph of(6eamrwiqr z,o tx5ndu -x f i3857,qj*mbxi: an object is a vertical line, the object isr3(mqx6 wno,xijatbm8 5 7z,f:drieq-xi*5 u

  If the velocity versus time graph of an object is a horizontal line, tn6wr8zd7l9 j lhe object isj 8rl zw7nd96l

  If the velocity versus time graph of an objeuq/eo0*yj yl9m izu ,d24* vcp bpe+p-ct is a straight line making an angle of 30 degrees with the time axis, the + 20*e*j p e- cm/u, uvopz9y4pidqbylobject is

  An object moves 15.0 dm ;iu+x.*- o ,vql,qv zsh4klm north and then 11.0 m south. Find both the distance traveled and the magnitude of thezh4x l,v lq*s,dk;i mqvo-.+ u displacement vector.

  A boat can move at 30 km/h in still water. How long wil f jr5y0a2r:ftbph3 3ml it take to move 12 km upstream in a river flb0maf3 rp fr3tyhj25:owing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi 3:k9* e cx3edyvl3)l/mgxnmq= 1609 m)

  What must be your average speed in order to travel 35+fwz69y2 kwky 7 zp6snnabs/+ 0 km in 5.15 h?

  A runner ran the marathon (4 l(l:hr ponxc rl2.hxx 6ea9/approximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runnellxol/a6 n .h( ep249 xrhcrx:r in m/s?

  A car travels 90 km/h. How long does it take for it to trnu owd6+)zj ) )vg0lzgavel 400 km?

  A ly (light year) is the distance that light travels in one year. Thf,z8f6p iizcgzf 19c wmse.*+e speed of f 6fg9c,1w.espz c*+i8zmif zlight 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 q1 ep9q;6q iabkm/h along a straight road and you look to the side for 4.0 s, how far do you travel during this inattentiqeqp 6b9ai; q1ve period?

  If you run a complete loop around an outdoor track (400 m), in 100 at1v)9x5t ncrs, your average vn5vrc91xtt a )elocity is

  A polar bear starts at the North Pole. It travels 1.0w v-v1 f52obsc;.wo5e4hynwb km south, then 1.0 km east, then 1.0 km north,5ww-w cosh2fv1ob5v4ny .e;b 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 trave- 2yx- vt2ajnxxy9tx:x3kx6 lls 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. :6 x2yxnl3xj-vt xakt-yx 92x This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at wh/y 9k:: oc(wy 3ifny55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h ( yny9hwf3/:yickow: . 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 l(5 gs9he8c-m lg52u3mwvlrpthe average speed of the motorist for wcgglp 2u5mllhr-v(5s 8 9me3 this trip?

  A motorist travels for 3.0 h at 80 ipgm,32hy,yl km/h and 2.0 h at 100 km/h. What is her average s pi,gmyy,hl32 peed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h-n97p1x szg 7sr:qmj b and then at 250 mi/h north for 750 xg 9rbzps -q:sn1m7j7 miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the gkl9o ,k.ncml80zs lz zl/9q:person who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for t90/kzzg ,q:l c z sl.moknl89leam 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 race?

  A car decelerates uniformly and comes to a stop afte*jxcz) k88/l qcs(ddo : 2blngr 10 s. The car's average velocity during deceleration was 39 km/h. What was c()/82:gb ds l lxn8* cdjzqkothe car's deceleration while slowing down?

  An airplane increases its spee 6ya9pr(:zv nkd from 100 m/s to 160 m/s, at the average rate of vpazn6r ky:(9 $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accfk.qkx+9ep ,o 5of;r zu;t9ec elerates 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 qa()nlf c51a3yx6vc h 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 accelert22 +zugh *8xcpidjs( ationc2h idg82jst*+xpu (z of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 4.1 m/s experiences a constant acceleratietr5 dy9lru :,on ofr ey5utr9: ld, $3.6 \; m/s^2$. What is the cart's displacement during the first 4.7 s of its motion?

  A bullet moving horizontall3k,h6i0 ,geym .ty gvay to the right (+x direction) with a speed of 542 m/s strikestm , .eakgyy3,g 6hi0v a sandbag and penetrates a distance of 64.34 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launch n* eoz 5d :6bu*iow,855x xvwutaytq8ed 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. Assuming the acceleration is constant, what is tax u8xv :qytw *d5t85e znbw*oo5,ui6he length of the catapult?

  A car starting from rest moves with constant acceleration ofm blag s60n5oay6l 2l d;nf*f; $2.0 \; m/s^2$ 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 avera:cq/2yrh r ic:z2hh 8vge accelerc/:rv: 2qirhz 8 y2hchation?

  An object starts from rest and undergf89y1 iw. z wmjizt8x k7my:n)oes uniform acceleration. During the firsttwm7zi j1k x )8y8wm:. fz9nyi second it travels 4.0 m. How far will it travel during the third second?

  An object is moving in a straight line with constant acceleration. Initiaycyndu- y82l1 lly it is traveling at 16 m/s. Three seconds later it ylydc1n 2 -y8uis traveling at 10 m/s. How far does it move during this time?

  A car starts from rest anwoa-rtv h;)o 3b(dkp) d accelerates 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 decelerate atbiwqqv/3vmkr2z6 ug pm-1-; w 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 cdsf8s0f5zd,.t atl3iar that has been waiting at the intersection starts ahead with a constant a f.8,idt0tl5dsf 3sz 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 surface of bxq-3r gnr:je +*.q ;mh/l5lbjgccf5 planet X where the acceleration gjmgej5lq+3rlx q f.b;n*/ -br c:5hcdue to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speedfzosjq 2r9he w+yn0ne*ep10- of 12 m/s on the surface of planet X where0s+oe rn*hj wpq 9 fzyeen120- the acceleration 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 a speed of 15 m/s onkd6k: vtq c*es+ 5awy: the surface of planet X where the acceleration due to gravit*56d::s ytkw+a kcvq ey 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.07m: 4 vf(jgbfuom xw/s on the surface of planet X where the acceleration due to gravity isv4fj:. um b 7o0wmxfg( $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is yhn( kb(+w e9m3qb jy1usually greater than 0.10 s. If your friend holds a ruler between your fingersb n+jeyk9(m 1bwh(y3q 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 velodqo4 a(dv 1nrzu-7zv 6g1cby6p d4- whcity after 3.00 yc7dp hv -b114zz udq-( 6dn46rowav gs?

  A bullet shot straight up returns to its starting point in 4 s. What is the inif0lwe1zey)pt+0iula /h 8 1avtial speed of the bulletezia p/tl)0+ u0v lfwy81ah1 e?

  A ball is thrown straight up with a speed of 36.0 m/s. How long dotnm0u, ik68e1 , zvqddes it take to return to itnd,mi , 8kvd tz106ueqs starting point?

  A ball is thrown downward from the top of a building with an initiy3u ono lt- w,(obthr+72yi f/al speed of 19 m/s. It strikes the ground after 5.3 sw37y(lnryut ,i2oobtf+ /-oh. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (onhyggs 74u+g )c9 nl2qrxp3jg;ly fill in numerical value in the b9 +4n gxgjcp37s2y ug;qrh g)llanks)
(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 uqtunbw )8 *2 (7ouwn (8.fkjvso w0tevp into the air with a speed of 41.0 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 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 = (ke yl cxntm -881eks51.0 s?

  In Fig. below, what is t7oz0h*vp77 lecg 0py ahe velocity at t = 2.5 s?

  In Fig. below, what is the veloci y7 h(mwm.x9kpty at t = 4.0 s?

  In Fig. below, what is2o gi: -uy5inj the velocity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 ma,sk8f2 fu e(s?

  In Fig. below, what is the average vecw a/t g0 s5m-c*rtx/bo+d6 m7g3p,ew yrka3blocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 sj0oz0v nxno r-7;/agj?

  In Fig. below, what is the acceleration at 3.0 ovq bmcz;uwi-/4j20sxxhr +2 0l2mr xs?

  In Fig. below, what is the average acceleratiw-*7db x-ko )8rwezyion from 0 to 5.0 s?

  In Fig. below, what is the ave-s7q- m7couip sh 0kc)rage acceleration from 0 to 8.0 s?

  In Fig. below, what is the displ skfi2vo.cm-gnq72 vu yi5-,eacement from 0 to 8.0 s?

Does a car speedometer measurekjywa5ods qc* )ib)jm7;k-q9 speed, velocity? {speed|velocity}

  An object can have a .io7tz862ib) ww osv gvarying speed if its velocity is constant.

  The velocity of an object can be negative wh ; *.u6ociui1 e*i*fje k9edgten its acceleration is positive.

  If one object has a greater speed than a second pl disi0+x0oi9jcd, k9+j6e uobject, the first must have a greater axd cl9,6k+ouji+pj 9s 0id0eicceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling 8(/ r9 jbmkutrwith 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 increa w: bdog,t37r4w xg8rxsing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves k r)-qqzp5 g7ethe bat witq)7pqkeg5- zr h 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 acces *l 3kd0zz4f v,gur5pleration, how does it change if air friction is ignore54,vls0d*u3 rpgzkzf d?

  As a freely falling object speed5 y +c 3t*i6gv(w0twiladjqg;s up, what is happening to its acceleration, how does it change if air frictio a;5wj0+g3*vgic (y6twidt q ln CAN NOT be ignored?

  An object that is thrown vertically upward will return to its0i,t44p lm2v;7wrz d e:pgs tl original position with the same speed as it had initially if air resistance is l ps2 r:t4wlt 07 pegi4v,;zdmnegligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero m o3boa1m nq5+rj+lp: acceleration at the same time.

  An object can have nonzero velocity and zero acceleration j wkruyg8nvyl,j43 7kv3.3 ne at the same time.

  An elevator moving from tk4 rq2 l*+huldhe second floor to the fifth floor making no stops along th*+u kl4dlr 2qhe way has zero acceleration all the time.

  A rolling ball moves from hv9pj8 d;0j; wl8h9d7fvk) cpzahww( $x_1=2.3 \mathrm{~cm}$ to $x_2=-7.6 \mathrm{~cm}$ during the time from $t_1=0.9 \mathrm{~s}$ to $t_2=5.7 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.2 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ is at $x_2=8.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around 73 wbys:q ztscy;duure m699 qo7 15oya quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.4 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from ,qn/ vst/zc8 rits trainer in a straight line, moving 96 m away in 9.9 s. It then turns abruptly az8qrv /tns,c/nd gallops halfway 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 fro t 8qxnpv.p))6n(foqs m $13 \; m/s$ to $22 \; m/s$ in 5.8 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 y5+,f0vnpavtc ,3 ikx a9y:h w$23 \; m/s$ to rest in a distance of 72 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed o 1-6vn0n+ehvm j6eqqz f $32 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of orkcxr gl:3 wke)*p*, the blocks to essentially top speed abouc3:ler )r** gwkp x,okt $11.2 \; m/s$ in the first 11.7 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 speu zi.f+-sjvj+p) ;d:*el uu ched of $17 \; m/s$ to rest in 4.48 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. Azvoyys d89ykyf3t 8: ng7:0jfssuming a decelerat7yt:3:0yoznj f8d9 y k8 vgsyfion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truc9ekd3-9dj .fvfa8a 5bq hp3um k 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 30.0 min. Aftey ub4o e*6 nk-gw0m)wsr exactly 27.0 min, there are still 1100 m to go. The runner must then accelerate-4okb0)6 msyw *g unew at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$