Suppose that an object :o.-l -jhxg 8jdjxgo :travels from one point in space to another. Make a comparison between thg:j jo 8 .ho-g-xl:jxde displacement and the distance traveled.

  When is the average velocity of a4b2 jq 8gsgr uwp+7hy2h 6xbwsotn2: 4n object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "fr;/yfk/oca+h qom zero to sixty in 8 s". This is a descriptiofa hc+ oqky;//n of

  An object moving in the 2vco a65ormt w:qs2f1+x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction)(e: *lcyozef4 begins to slow down as it approaches a traffic light. Make a statement concerning its aoye *cl(e4f z:cceleration.

  Suppose that a car traveling to the .vii tqhy0*w4 cvmlw 1u5n(n 5West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its accelera .i4vw15 5yu i*hm0q v(nctlwntion.

  Suppose that an object is moving w , o7:eiyxb+o y*pvnu*ith a constant velocity. Make a statement concerni p7uv,bie o xy*y:+no*ng its acceleration.

  If the velocity of an object is zero, does it mean that the acceleration is zerok+q5.agzoqs8x h 5i)g? Support your answer with an exg8 5sgzx5k)aqi. oqh+ ample.

  Can an object's velocity change direction when its accop 6w0 m8lhpohev3 h/.x u58jgeleration is constant? Support jg5o3p8p mxhhh0 ./6ov wuel8your answer with an example.

  Suppose that an object is moving with constant acceleration :qi)e k:andw geyhq-f5-yv a/ s8-a,j. Make a statement concerning its motion wia5nvh :ydq-aysieaew 8kj ,- q-)gf:/th respect to time.

  Can an object have incread8-;ij ;yr;y p f1lirtsing speed while its acceleration is decreasing? Support yr ;f1y8i-t d; rlj;ipyour answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth 86rva;x qx nspq6bpi2)w)r-i hill of ice. Make a statement concerning its accelerat2rqasq6 pi)b;-iwn6r)v 8pxxion.

  Under what condition is avec zfiim -er/;md 187harage velocity equal to the average of the object's initial and finalr maed;m7z 1 -/ichfi8 velocity?

  Objects A and B both start at rest. They both accwczdf;3 5 +pkf 1nid0-*hm zhhelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of ochw kzhdhn1zm+-0 i3 df5*f;pbject A compared to that of object B?

  Objects A and B both start from rest. They both accelee;* k )*ny/ixpn)llqurate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of objecti)l/n l)eyp;uq *nkx * B?

  When an object is released from rest and fala)4 otin3v sl8ls in the absence of friction, which of the following is t4asn)83 litvorue concerning its motion?

  When an object is released from restnz2*f5a o+hjc and falls in the absence of friction, which of the fol2a + j5nc*fohzlowing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a spde,ggebz38w87fimej 3+ bjk2 /e*sn tatement about the velocity and the acceleration when tn+* fmzgi3ebd3wkej7 b2p egs je 8,/8he ball reaches the highest point.

  Suppose a ball is thrown straigxf/w j8umq o o:;ti-1tht up. What is its acceleration just before it reaches ito1: -w8xqut tm jo/f;is highest point?

  Suppose a ball is thrown straight up, ream /.iv0a ijg1vches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and ac /vig1a.m0ji vceleration as the ball is going up.

  A ball is thrown straight up, reaches a maxiufr ir h-l0(z2x lh8c:mum height, then falls to its initial height. Make a statement about the direction of the velocity and accelerai0 2u8xrclz h-lfh:(r tion as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. M- n.h o5;nhvwuake a statement concer .houw;n5-h vnning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What/.zcbe/ fv 8oe is her acceleration when ceo.bv z/f/8e she she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An idenwlpm(0/m goushw7,9 ytical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the mawmwgp0u7(yso9 , l /mhximum 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:qa kzu.0eb+m . One second later, ball B is dropped from z que. :amk+b0the same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One secka;k47xbsulh89/ b tw8 0b+can ols-sond later, ball B is dropped from the same building.w8llcat4sbu bka7 ;+n/hx-so 9 b 8s0k As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown upg10-dq(.e n9 u9hgtenc 0rid i, and the other is thrown down, both with the same initial speed. id9neg c1qr 00.eh(n-9tugi d What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A seconq-d:63tkx(g6j k 2isle r vt7xd brick is thrown straight down from the same building. They are released at the same time. Neglect egi :j6xl-6k2t qrks3tdx(v 7 air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero q wb77v./oa dzvelocity in the +x axis. The position versus time graph of .bo7 /wq7vazd this object is

  An object is moving with constant non-zero acceleration in the +x axis. The posiw aar,3p ),6 u+l vzoi6cvb;dbtion vev+r u,v) p; 6iwcoad3z6 b,balrsus time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. T;qmfpd9 zwb0it px/p p(4* /f4gvj5euhe velocity versus time grapf ;9pu/wzm g(eqd50fppxt 4b/v4j* p ih of this object is

  An object is moving with constant non-zibi:4 jx.dfo sz(*gh.ero acceleration in the +x axis. The velocityi(gh o.id. bz:*fs 4jx versus time graph of this object is

  The slope of a positionm hi-mgo5 qn.5p zm98e versus time graph gives

  The slope of a velocity c45:kn3 xg+ uqzfx,whversus time graph gives

  The area under a curve in an acceleration versuld+ -8pwp+o-mo-rx ci -a: dykb -2mxfdk ;;hos time graph gives

  The area under a curve p3 zo5w+)jf zkjjyumc)2* r.sin a velocity versus time graph gives

  If the position versus time graph of an ob uv yfgn.6bpwlf4:2l- ject is a horizontal line, the object i uywblv:fn 6f2pg.l 4-s

  If the position versus time graph of an object is a vertical line, the object4)wp diiwy 2t4nfu08m yq*g(b f 1ig-t isbqi-1f4n u0)w *gtmt (4giwpyd f28yi

  If the velocity versus time graph of an object is a hogbp57 v4n+1d f5 rb.x9ijno wwa fr(b7rizontal line, the object idfn1wa5(4woj97 f5 b7br+ vx.bn pgri s

  If the velocity versus time graph of an object is a straight lineaa5r 0 t rmvz2cv-5a7a making an angle of 3a5vrva z-50tm7ar 2ac0 degrees with the time axis, the object is

  An object moves 15.06sfb4z6mzr2tk-n o-c9px .6cljdk+ n m north and then 11.0 m south. Find both the distance traveled and the magnitude of the displacement vector.dkjcc9 pm+nftlb 4o666x2- k.zzns-r

  A boat can move at 30 km/h in still water. How long will it take to :*eik33 z9,glr;qgdi 9 sc aaamove 12 km upstream in a river flowing 6aisa9g,a erq:cd zg9;3 l*3 ik.0 km/h?

  55 mi/h is how many m/s? (1 mibsvey8 (a+ 3jj0 ,oijh = 1609 m)

  What must be your average speed in p 52 ftpxwmeq zw4;(8worder to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 mp.( +fupvsw5y in. What is the average speed of the runner ipyp 5vws+u.(f n m/s?

  A car travels 90 km/h. How long does it take for it to travel wn 5mwl 2e+ 0eo5r0eic1 zd)xge+:uoc400 km?

  A ly (light year) is the distance that light travels in one year. Tagv4vk2zu+hx55 0or khe speed of ligvvkku za rh552 4x+0oght 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 straigh+*gg *myhi: nwt road and you look to the side for 4.0 s, how far do you travel during this+ g gmy*:ni*wh inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your avefyhudn7s 3fne2.-ec cs8rn v28ox h03rage cf n8ehe3 .uy2x-sh20ndo7 v fc83 nsrvelocity is

  A polar bear starts at the North Pole. It travels 1q5(bwn sx uj ijn*p;v q-s7kc+ tk/7e8.0 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 takekj*i-nc(kb7 ; 7 n5/tsjwqpve+qux8ss 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It trapxdg 0;3oq1g*xn gu 3gvels 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. This trip takes 45 min. What was thgd x *oqn;0ggx1ug 3p3e bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 mi4*fwqb*fj d o) xq;5ulles. It then starts to snow and you slow to 35 mi/h. You arrive hlubwjqf*d ;)xfo 4 q*5ome after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80zd6wsg:.o9a/ft / zfj f*nqq8 km/h and 160 km at 100 km/h. What is the average speedtqj gnfo9 qz/d*:zf /sa. 8wf6 of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/+uu:0m*did hl h. What is her average speed for thd0lu idmu+ h:*e trip?

  An airplane travels at 300 mi/h south fea*ab4,h* - esbnp r;nor 2.00 h and then at 250 mi/h north for 750 miles. What is therhea;a* *bbn4se- ,np average speed for the trip?

  In a 400-m relay race the anchorman (the person w n6vk3m6gf ;5h8 mnzngho 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 runnerg38nmg5;v6 znfh6n km starts the final leg of the race, in order that the team A runner not lose the race?

  A car decelerates unifol;fq8 g2d;xefrmly and comes to a stop after 10 s. The car's average velocity during deceleration was 75 km/h. What was the car's fx;2;f g d8qledeceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at l3pn8iu efz. z 9u)p-athe average rate of f.lze u -38zip9 )uanp$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the p-rkhy;bs,w7cndvb+ 1 r (1yhfc8joo o(-3sdrate 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(tyw.i1 a; fnh $4.0 \; m/s^2$ 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 a6r-s*lzqtg *8 ,d.uiaxq nc -bccelerationznq t udc-rbs8lg*,- 6* .aqix 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 6.8 m/s experiences a constant accelerati def+um.4d hg7on of 74gd. m+ fuhde$1.1 \; m/s^2$. What is the cart's displacement during the first 4.2 s of its motion?

  A bullet moving horizontalkzodg jg4void( ;/*8gly to the right (+x direction) with a speed of 393 m/s strikes a sandbag and penezkjg4 voi8 gd* /o(d;gtrates a distance of 56.05 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is l2r9v 9j4kqm v igxsf3-aunched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at 4 293rsxk v fjgqmvi-9the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant accg.chh e9xcu;3h 6my k.eleration 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 m. )q ss-bmo -x4jWhat is its average accelerati s)-jo4sxm-qb on?

  An object starts from rest and undergoes uniform ac,,tcc 3rcfk9c celeration. During the first second it travels 5.5 m. How far will it travel during the third seckccfct,c3 9r ,ond?

  An object is moving in a straight line with constant acceleration. Initi j vxvubtj-e.2xsh k 2 vitf)-77;y0kfally it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it k2)y77ve.fjvsi 0ttj-hu ;fx bk2xv-move during this time?

  A car starts from rest and accelerates uniforkzi1 xz6blxojor.5yw/:6ft 7mly 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 deceleratgpu8rnqp186xxuz 7w 7cbg0ar/hd lb,3zvr3* e 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 bee)xq+8qb0 wy dkn waiting at the intersection starts ahead with a constant acceleration ofb8d xk +wyq0q) $2.00 \; m/s^2$. 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 surfa-ymv( 5c8/qzhs ojonj4eq* s2ce of planet X where the acceleration due-48m zo*sqj(yqosh j5n2c/ ev 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 surface of planag m ;9;dfqp;jet X where the accelerati;madqp g 9f;;jon 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 0yt d 79j.ptfk6ftpj-of 15 m/s on the surface of planet X where pdtj-0fyj tp.t697k fthe 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 with a speed of 14 m/s ong:+a6 ocr. zmmt 4wccm9vr9p3 the surface of planet X where w9:3.v cmcma gm4 ztpcor6r9+ the acceleration due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time yv8loav zr8(/nh5 58 iozx1ifis usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how fa fyzr5i8 ho /a81(8o5lzxvvn ir can you expect the ruler to fall before you catch it?

  A ball is thrown upward am z)6xkfz-*wkrs -.,xhnw k1zt a velocity of 19.6 m/s. What is its velocity after 3.s km-,n. f6z-xhxz*k)kwz1rw00 s?

  A bullet shot straight up returns to its starting point in 7 s. What is th 5/6ezd g 6fr zknreb;qk*.(mre initial speed of the mrz5eb( fkqe;6z k/g 6nr d.r*bullet?

  A ball is thrown straight up with a spesigsoda;*ik(lej.* - ed of 36.0 m/s. How long does it take to retur* *i sa.gsdl-iok (e;jn to its starting point?

  A ball is thrown downct xs:g67mqr mo4n2 ua+4n7 d.aq4mgg ward from the top of a building with an initial speed of 14 m/s. It strikx.m asdno42cmgmqg 67:7 4a+nu4rqt ges the ground after 6.2 s. How high is the building?

  A ball is thrown straight up with a spqtj4 0t1h:83wksye (+rrz c qxeed of 30 m/s. (only fill in numerical value in the blanks)eh:(r ttqckwr1 3j8y +q4sxz0
(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 speeq* .l* jbi8tpcfc( y.id of 24.2 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 2 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 velocity at tchn 8ok;xae:- = 1.0 s?

  In Fig. below, what is the velocity at t z+k0azp:uu( p/) mpia= 2.5 s?

  In Fig. below, what is the k4t.js 5h*frol0fx 0:tm6 uts velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = zk-rpuf,io 9ub5 g8.z5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.h5o*;xmp wpej-h;0nmi3l q y.0 s?

  In Fig. below, what is the average velocity from 0 to,1p ()l7i v5ttmqvqx k 6.0 s?

  In Fig. below, what is the acceleration a2 em0 hm n/:g)oepciu3:ueas .t 1.0 s?

  In Fig. below, what is t ki3-h0kbqwg9 he acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 toh t4cmjx)- xu3 5.0 s?

  In Fig. below, what is the average accelerationz mm.xeji zit 533/ra1 from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0 ev(bq2cm.bpdy i /)f+ s?

Does a car speedometer measure speed, velocity? {sped9 jhj;+k yt 87ssi0mied|velocity}

  An object can have a varying speed if its velocity is constaup pei4 nsy94/o0 -tf 3ppnb3bnt.

  The velocity of an object can be negative when its accelerath 3n-f4qgubn+ xa ov4,ion is positive.

  If one object has a greater speed than a secotoe5l:px2gz 9 zomc;(, .wfrn nd object, the first must have a greatere,w:z9fx 5.rco2tpnz( mogl; acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling w (3n1td,pdic4u3n3xhvl h o/n ith 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 increasinvw zauag 8 ycdi5w)0o-dps;(*g in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves the bat w7z*(e sdg :grmd n)tr4rt(5apith a spee5d(dtgt(7gze4nrasr m*)p : rd 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 accelerati6jpxg 1;z c 5k5ev5bv g;o/-gbw3lijjon, how does it change if air frictioncb3vggo;- p6j5x v/zb gi51wj;k5l j e is ignored?

  As a freely falling object speeds up, whlled;qo0r sqb*w1 0l5at is happening to its acceleration, how does it change if air friction CAN0olq;l50q bw1dsr e*l NOT be ignored?

  An object that is thrown vertical n*f hva22zwunzyk(cac )uy h2(1gx5(ly upward will return to its original position with the same speed as it had initially if air resistance is negligible. If airu(h gac2(*zkw1hcyy( 5 x)nfavzu2 2n resistance is appreciable, how will this result be altered?

  An object can have zero velocit/lqp2 xlmf*mg7iqw a 0ps53.v7;anily and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero v3c/0ew+d05 g rfv wj2m7rrvn acceleration at the same time.

  An elevator moving from the second3pmbyl m9 k./ree7eb ,nx mq39 floor to the fifth floor making no stops along t9q 9m /3x.br7e3 ym,eplnkmbehe way has zero acceleration all the time.

  A rolling ball moves from p p(jqg1lwu7 hsj/2v ,$x_1=1.8 \mathrm{~cm}$ to $x_2=-7.2 \mathrm{~cm}$ during the time from $t_1=2.5 \mathrm{~s}$ to $t_2=5.3 \mathrm{~s}$. 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 $x_1=3.1 \mathrm{~cm}$ and at $t_2=3.7 \mathrm{~s}$ is at $x_2=8.0 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around :pb/ hk-j2jv 7a8etxja quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.0 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, mov c6 f 3;l3crts19dmypying 104 m away in 13.8 s. yplc t 3rd 9f;3c1ysm6It then turns abruptly and gallops halfway back in 4.6 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 froxrxtgksu65f 2 0 06ovhm $11 \; m/s$ to $24 \; m/s$ in 6.0 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 froins o2a g+3;fhm $19 \; m/s$ to rest in a distance of 63 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach 7m,p5)z grz/v39j b ufctltz.a speed of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.6 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of 5 6x ha-138imdi* dhdwzc8faithe blocks to essentially top speed about dz3i5xdf 18mwa6h ca- di* ih8$10.1 \; m/s$ in the first 14.4 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 speedqy:r h9+yi wl6 of $16 \; m/s$ to rest in 4.05 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 h:jnegtb. 7gi 2ighway. Assuming a deceleration o2itnge 7. jgb:f $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goin i-qoc;b07lmi 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 complete the 10,000-m run in l5omcp2 8tv wt5ess than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must tc2tow8 5tpm v5hen accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$