Suppose that an object trav1e r jvo(wv+8;5t,6kwxpkb r jels from one point in space to another. Make a comparison between the displacement(xr tj5 we1 jw6vborkv,+8kp ; and the distance traveled.

  When is the average vovbvf:bj3; o2 rd 5fn;elocity of an object equal to the instantaneous velocity?

  A new car manufacturer advertises th cp28lpe1* slw2bw( ecat their car can go "from zero to sixty in 8 s". This is a description ofpsl1 (8e cp2ble* wc2w

  An object moving in the +x axis experiences an acceleradb2 k;gfar.jxn/zt q6:y gt8dluadg:-3b /.h tion of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direo(cpfq) u6x.ax) i3vdction) begins to slow down as it approaches a traffic light. Make a statement concerning its acc cv pxq6od.ax)3() fuieleration.

  Suppose that a car traveling to the West (-x direction) begins to slow wa8(m5 dgsn o7p f,ml /dn73f)wo(xpmdown as it approaches a traffic light. Make a statem/soxldna7 ffwp mwg,m)7 5np 8d((m 3oent concerning its acceleration.

  Suppose that an object is moving with a constant velocity. nd+yem9 iyyj2-e( gvh:,c g9 )u1rbreMake a statement conce19y gy+idru2 ( nc:mhvbe)e- ej9y r,grning its acceleration.

  If the velocity of an object is zero, does it mean thg-(eea2sz9s3-zgo y o at the acceleration is zero? Supp(gzsee 3szo9g --2y oaort your answer with an example.

  Can an object's velocity chan3zvhp p/ .tuiu3f7 1zige direction when its acceleration is constant? Supportiu3.3 1/v z ph7fpzitu your answer with an example.

  Suppose that an object is moving with constant accel y qm0v-*,kcu rqtm4d3v 7in4ieration. Make a statement cktvmqm 3y ,ic7q4n- 4viru*0doncerning its motion with respect to time.

  Can an object have increasing speed while its acceleration is decreasing? So4ox,2 hf wlhrh, l/j/upport y/,wh 4h2fo, hlxrjlo/our answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hi dd t tul/dd+(8hct+-kll of ice. Make a statement concerning its accelerc8dd ( +tl+kh/d-d tutation.

  Under what condition is av 9cy:z9 )w1i fob;5 fxgpld9uyerage velocity equal to the average of the object's initial and final vbyp1ud i9f;)glzw 9xfy 9o: 5celocity?

  Objects A and B both start at rest. They both acceler+ud5xn+q (xg sate at the same rate. However, object A accelerates for twice the time as object B. Wha x+qs5un d+g(xt is the final speed of object A compared to that of object B?

  Objects A and B both start from r(yjy txv9 d25zest. They both accelerate at the same rate. However, objectd9xt yj(2vyz 5 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 release qu6ld11 iyxowr;bful0p2*5id from rest and falls in the absence of friction, which of the following is true concerning lifyuop bu*d1 w l i620rx1;q5its motion?

  When an object is released from 5s +c 2clm* hhumrf;:orest and falls in the absence of friction, which of the following is true concerning its motioncfm+c: oh;u2*l5r sh m?

  Suppose a ball is thrown straight up. Make a stat9lorzpoac iaxp6 7)8oo t9o- ;ement about the velocity and the acceleration when the balzcp979txi8-o)o;ala 6po o ro l reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleratqbct(nl-5s -y3g 1mk n: qa1jyion just before it reaches its highes1 nq 1bm5:yyq3-s-nglc(k ajt t point?

  Suppose a ball is thrown straight up, reache pex :oxs4jp0r10pjp. s a maximum height, then falls to its initia pr 1xpjp:4ejosp.0 x0l 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 heighk0lr1z4kqi * g0q8s 9g6hroubt, then falls to its initial height. Make zbks169q0rhr* gkuqlo0g4i8a 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 resistance. Make a :o03d1nfc8un zt : l1x,pqmur statement concerning itspquo:z x 1t 0lc:mf un81r,nd3 acceleration.

  Suppose a skydiver jumps from a high-flying4 yc0wsa8tx18loo k:u9 sug,b plane. What is her acceleration when she she reaches terminal vo 8k89xots4y u0gblcw1 u,:aselocity?

  A ball is thrown vertically upward with a speed v. An identw;*k iwe 2non;l8:yrqical second ball is thrown upward with a speed 2v (twice as fasty* nkw2l q: ;n8ewo;ri). 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 s h) md- xhhrrtcp10*l4econd later, ball B is dropped from theth rxc4*p-1rhlhd0)m same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ba2 wjr /l.gajr1ll B is dropped from the same building. As time progrr gj12 jl.wr/aesses, the difference in their speeds

  Two objects are thro pqan-ox z4+6iorh43 ywn from the top of a tall building. One is thrown up, and the other is thrown down, bothoi xq463zor y4+npah- 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 straightm+ wje *;(sdvt down from the same building. They are released at the same time. Neglect air resistance. Compare the accedwtm ;e(s+j*v lerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The posii.mqh gy8- m ),urn(iition versus time graph of this oui,)(n8 rq-g. m ihmyibject is

  An object is moving with constant non-zero acceleration in the +x a c8r0du 3zvxun//:xfxxis. The position versus time graph of this ouxcx3rv /u8/f0zn x:dbject is

  An object is moving with constant non-zero velocity in the +x axis. The veugtjp:pc8t79o27l i5yfh) zs locityph9yso:f52zci t8u7jg l)7 pt versus time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axixko m,5q w+s5ps. The velocity versus time grap5kxpoq +wm s5,h of this object is

  The slope of a position versus time graphc3)5-an;zsamrdjt f p9f : dck+ad/m: gives

  The slope of a velocm npnz +ph qur,-lg656ity versus time graph gives

  The area under a curve in an acceln7o,2ka gt7bis3m:j ai+vd/deration versus time graph gives

  The area under a curve in a ve/fe17ghhdc,cu6;/, gf g owmgprjf( wi1+a5m locity versus time graph gives

  If the position versus time )w 0/ mmiggp6ik ltg/q,dwtf0;m0,ijgraph of an object is a horizontal line, the object mwitqim0wjgd ig); l,0pg /6fk/,0 mtis

  If the position versus time graph of an object is. l5/d 7b -1)tyqkv elldxh9jr a vertical line, the object is l .rqb1ke7j)x5lv /y9d dtlh-

  If the velocity versus time graph of an object is a horizono+obe3-dal1hnb*g cdf7 :8xy tal line, the object ifhloax7*ddc 3g:n bbo1 e +8y-s

  If the velocity versus time go8s71idndle *5a (ih/dhw- svw ij:6braph of an object is a straight line making an angle of 30 degreeeiid wwblshivh5a8: /6- dos71*j n(ds with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance travt9 tz v/z1jgich28j-uxo62 cdeled and the magnitude of thed 2zgo h-2zi8j 1jt/ uxt9vc6c displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to move 7/jvc 6(1dz i8rajmdd6yqdf- e h,p.j12 km upstream in a river flowimi8a dcpd6( eq dr-7jh/fyjv1d,6z.jng 6.0 km/h?

  55 mi/h is how many hh op( e/oym8/yh,6a am/s? (1 mi = 1609 m)

  What must be your average spehp(d)ngjk wx jap/8at;+d.+ k ed in order to travel 350 km in 5.15 h?

  A runner ran the marathom0dy 4dthm-8 gn (approximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner8thmydg- 4d0m in m/s?

  A car travels 90 km/h. Hows*t-pwj*t6y4 d5o b sa long does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in 1ua luaa4ad2 -ejx/4zone year. The speed of light is daa4j/zuluxe4 a2 -a 1$3.00 \times 10^8 \; m/s$. 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 stra bpq +(mxr62pbdh(z6ukgi 41 iight road and you look to the side for 4.0 s, how far do you travel during this inar1pixu4kzpd6i6(b+2 h b(gqmttentive period?

  If you run a complete loop around an outdoor track (400 m), in 1nh.1jb xa5r r+0 t.wig00 s, your average velocitrnai1.x gj5h.rbw +0ty is

  A polar bear starts at the8y6fgai-xw dx 1,qxzj*e x ef+88ls2s North 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 starting point. This trip ta8 8sxyziw-x *jgfl1a2 ,qx6s8fe+d xekes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km s7ub)lef 53 qaeu88x dkouth, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting p5f3u e)b qlu8x8a7ek doint. 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 110zus( eyph7+ c-aq 0i4ht9y -ic miles. It then starts 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? ccu-0-+szi4 y79tpqh a h(yei

  A motorist travels 16awu vj.+. 6skb0 km at 80 km/h and 160 km at 100 km/h. What is the average sb w +.uv6jask.peed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and qo;z.,u5 eks(e eq g,j2.0 h at 100 km/h. What is her average speed for tq,gs;,ee ju q(.oke5zhe trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h wkol8b.p( p z7north for 750 .(7 lppwk8ob zmiles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs thz.y4i) jlqvu ;e last 100 m) for team A can run ;.4)lvi jzuqy 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 race?

  A car decelerates uniformly and comes to a stop after 9:ark6u *1hiz y s. The car's average velocity during deceleration was 59 km/h. What was the car's deceleration while sloyiru a: *z1k6hwing down?

  An airplane increases its speed from 100 m/s to 160 m/s, a6 (( klpxi9* kj8nvmdpt the average rate of 86dkp(i v*j9 pmxn(kl$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h aco45.6 hjnh b9+rc:g wypz0zzi celerates 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 g:ul3h/vlnsn6 .kw6dil 8)qpand 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 then2eqv wxg(wqm- pw zn2q*b;n3. speeds up with a constant acceleration ofqmzq -we(;.x3n2npb g2 *qvw w $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity o559bpk su(opjf5jb ny;s:c dh55y/ dx f 2.5 m/s experiences a constant acceleration ofcsy;h s5(5p/j : 55pdj9 ob xuyfnd5kb $1.6 \; m/s^2$. What is the cart's displacement during the first 5.6 s of its motion?

  A bullet moving horizontally to the right (+x direction) 0yq;n*im5kk 8g3g4 h st7roxzwith a speed of 244 m/s strikes a sandbag and penetrates a distance of 31.76 mr*05n4oqygskzth ;ix8 3g 7 kcm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. It ,j7 4 sc3pkps(/xbvi(j.uxlv reaches a speecjvp,k3( 7jv4u px s( b/.silxd 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?

  A car starting from rest moves with constant acceleration oip6r.r *d(gvf q ee .x,elz10nf $2.0 \; m/s^2$ 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 tptp66f8 8z ,wjnhbt,ke5x)p go 80 m/s in a distance of 200 m. What is its average actj ,zp,)8hxf6 wten5 b ppk6g8celeration?

  An object starts from rest and undergoes uniform acceleration. During the fin u 3gk4clk0*urst second it travels 3.4 m. gl k*nuku4c3 0 How far will it travel during the third second?

  An object is moving in a straight line with constant acceleration. 00 hz9xy/wi.xs *9iud fe ayn)Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during thisdhiz y0w. /9usyx9nx*a 0) efi time?

  A car starts from rest and acceleraf(i2a7w1txrulznd0a 2ttu * 3tes 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 yop9a nk3h2 ;uvlt: 64vkq jggt,t.)8 i-tzawdry 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+0 lsaw,o 79q5pqf r (k9dflzf car that has been waiting at the intersection starts ahead with a constant acceleqps f7f99 kad+(lw fzl0,r o5qration 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 speeugnqq) --+g+cissg8 od of 12 m/s on the surface of planet X where +conqu ) -g+gsg8-isqthe acceleration 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 speedvk l; :r;r4rcq of 12 m/s on the surface of planet X where the acceleration due to gravityqc 4lvrr; k:;r 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 a:(ixb9w2) n;gk hok cwhereh9 ;w2ixg ca:b(k kon) the 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 on t)c3 eei8irj ecdt:4 n6he surface of planet X wherecc4i:ei3 j8en6) terd 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 is usually greater than 0.10 s. If your friend holds a ru6) t dhgpwyc1psa: b:-ler between your fingersw gy:p a:ph6cd1s)tb- 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 after 3w:z k44howq + 6z)5jbzxuyoi vq; *0vgct06bg.00 s? izuq6zo:0hy w6t4jw)v q0o4;xvb z* gk+bgc5

  A bullet shot straight up returns to its starting point in 9 s. po0ww9 ;zyu;1 jtyr g4What is the initial speed of the bulzwyy ;1uj4grto9; pw 0let?

  A ball is thrown straight up nc gm4 i 65 .grz,c0rer+ko*qnrff16bwith a speed of 36.0 m/s. How long does it take to return to its startininz r0r*r.6egfk6 ,g 1bo5fmq+nr4c cg point?

  A ball is thrown downward *l9 tf dumi:i8from the top of a building with an initial speed of 29 m/s. It striktiu f8idl*9 m:es the ground after 3.1 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (on:uq3(yotq 9qcn 2bu-rly fill in numerical value in the blanrn ct29quy(o : b3-qquks)
(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 intoh-eipm:k5-z+mebul -,o x -iq the air with a speed of 27.0 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 1 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 ia;ep* lyi1;fp s the velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t = 2.53;5)zoh i 5(;tvadb3x k4rny cf)svpa s?

  In Fig. below, what is the veloc w4px8 ya.gr,( 2ihkkcity at t = 4.0 s?

  In Fig. below, what is the velnu *mfwi/9 klf24vx+zocity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4. w(+*3pteptn s0 s?

  In Fig. below, what is thu5nzf-dw0psv op9/q5dy d1 +ke average velocity from 0 to 6.0 s?

  In Fig. below, what is )g *bd -9o2yk pkiq;ecthe acceleration at 1.0 s?

  In Fig. below, what 1aek sex8)43:lbk tbfyqx 1p/is the acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0s:yc n;h8ele6 to 5.0 s?

  In Fig. below, what is the average accelero1jux9e x+2 sdation from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0 a(tjw3h, 1h:7e qwoow xz8tg;s?

Does a car speedometer measure speed, velocity? 0t*u 6onihi)vl*af+r {speed|velocity}

  An object can have a varying sp02rglg f+ :f wt:2ru4yav/ svieed if its velocity is constant.

  The velocity of an object can be negative when il+x2x 6sm c wc/z82f8 q.vpqpzts acceleration is positive.

  If one object has a greaternkr v dg p6q,d;hc/b4; speed than a second object, the first must have a greater acceleratiopg ;cd hkv;4db qn6,r/n.

  Two cars emerge side alno3k 6whpd2x9zu uao6l9 ogi2 r7( 8by side from a tunnel. Car A is traveling 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 5ivuo-v4qf* zq0j2tsob3i 0w speed as its acceleration decreases.

  A baseball player hits a foul bcjuhr d(6k i4+v:.l kvall straight up into the air. It leaves the bat with a speldkrv. uji+ h vk:(c46ed 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 sk1oe n ib,z(s8m r8f:9l6sjn z)xqy ,cpeeds up, what is happening to its acceleration, how does ncom(s k)z9q 8jfny,irx6l z:8,s be1it change if air friction is ignored?

  As a freely falling object speeds up, wha z777 wcjau)pqt is happening to its acceleration, how does it change if air friction CAN NOT be ignored7pzqcu a) w77j?

  An object that is thrown vertically upward will return to its origina) x6:6;e0v g pkba2 x4ovnrxiil position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be xi0; pb xiev2vnx4ar:o k)6 g6altered?

  An object can have zero velocity and nonzero acceleration at tbqy c ,(q/ba bdijo 7gk/6hu-6he same time.

  An object can have nonzero velocitya87jgfu7lpf 8 and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor m 9qyn.y vay,n0aking no stops along the way has zero acceleration ,n 0q.ya9 yynvall the time.

  A rolling ball moves f hv/ +y 2r 4qyla4q:0amqi1puprom $x_1=3.2 \mathrm{~cm}$ to $x_2=-6.3 \mathrm{~cm}$ during the time from $t_1=2.6 \mathrm{~s}$ 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 $x_1=3.2 \mathrm{~cm}$ and at $t_2=4.2 \mathrm{~s}$ is at $x_2=7.6 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-muf0/-fp a2 .jbd hca-cile ($1 \; mile = 1609 \; m$) track in a total time of 7.5 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away nm vb x.,k+pf 7ftk4t9from its trainer in a straight line, moving 92 m away in 11.3 s. It then turns abruptly and gallops halfway back in k. +4nfttxp ,kvb97mf4.5 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 v;qd3t*akwr m3.s)b 6kor h(p $12 \; m/s$ to $24 \; m/s$ in 4.5 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 nlxm46+g y8if/g,xn adk/ w3o$22 \; m/s$ to rest in a distance of 78 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach, dfrbo fij8f;l5r0 /c a speed of $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $3.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst ou u d 8(rxlr1zo7vhz/;u n0gss*t of the blocks to essentially top speed aboungsvul u;*8z1h(x/7szr rd 0 ot $10.1 \; m/s$ in the first 14.8 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)by 1-i).ue(zpe6pp kh.ud go from a speed of $15 \; m/s$ to rest in 4.93 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 0.,ca;bc8df(eny1f r u eorjgc9;m -phighway. Assuming a decelerationmf yce (u9gjd;o-0pneccb1ra ;,rf 8. of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck7t9*o 6hjs wwd 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. After exactledt k(u xz.cjo: o40,iy 27.0 min, there are still 1100 m t.eu ,c0: (z ojdixkot4o go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$