Suppose that an object tr 8qv0j a89dvaw6r,t nlavels from one point in space to another. Make a comparison between the displ j9a608rqv 8lvdw,t anacement and the distance traveled.

  When is the average velocnvv+ i59m+.h: nos :bva/ uuuqity of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their ryfhnawzsl0 x6.ye p9(c63 a5car can go "from zero to sixty in 8 s". This is ynwafr0yaxe 6hlcs. 9z 3p(56a description of

  An object moving in the +x axis experiences an acceleraz7wa2p. b4hw 7qd,muupj24) hg g bd9otion of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to sl4eu rq81zi1ijow down as it approaches a traffic light. Make a 1zju 4e8iiq 1rstatement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins t4nipl v ,k).jhxe2ev.o slow down as it approaches a traffic light. Make a p.,4vejxliv)n e. k2hstatement concerning its acceleration.

  Suppose that an object is moving with a constalvi y5;n.t:9x5h sybr nt velocity. Make a statement concerningx.9yh:5r v ;ntbl 5siy its acceleration.

  If the velocity of an object is df3 hp+h0jda2i wweivww41 5, zero, does it mean that the acceleration is zero? Suppw0ejvi,+aw3pi5h4 hfdd2w1 w ort your answer with an example.

  Can an object's velocity change directiotn2osg lf2 g:5n when its acceleration is constant? Support your g:nlfo22 gst5answer with an example.

  Suppose that an object is moving with constant acceleration. Make a statemen) * ywyekdp(k3t concerning its motion with respect tk( *kwe3y dpy)o time.

  Can an object have increasing speed while3gn3qi gl;afdr,+vld1ey ;5- /i sjuk its acceleration is decreasing? Support your ansgr,3a 3;en -gl5sjf yikid;/dvq+l u1 wer with an example.

  Suppose a can, after an initial kickyl..uvb8lx- ou +v 2 rmtewl;), moves up along a smooth hill of ice. Make a statement conceruy -t; .b .vlleom2x+vu)l r8wning its acceleration.

  Under what condition is average vmebx u+z,z 5*)mfzog +elocity equal to the average of the object's initial and final velocitfmu) m+e ,*zbzog z+5xy?

  Objects A and B both start at rest. They bot k7:q*juc4 36agzqhoocuwfcu 4 0;fc.h accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that c cc fau;kq3:wg uj4.40* 7cuhoo6z fqof object B?

  Objects A and B both start from rest. They both accelerate at p:hl6v lreq0yz h2x0 5the same rate. However, object A accelerates for twice the time as objer0h6:yzl2 0vl5px qehct B. What is the distance traveled by object A compared to that of object B?

  When an object is released from res3xhigrdm 5z +/t and falls in the absence of friction, which of the following is zm5 xh/3i+rgd true concerning its motion?

  When an object is released from rest and falls in the absen bj.8gz:3 xb0p1qm15v lilxikce of friction, which of the folx8b :0q.mkjpi 131zivlx5gbl lowing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statemens, 6knb9e3y7 jxq)s axt about the velocity and the acceleration ,js63xq 9 7 akey)xsbnwhen the ball reaches the highest point.

  Suppose a ball is thrqg +*x6*wbfu wpq/ zs6own straight up. What is its acceleration just before it reachesz 6w*/gsfx* q6+ pqubw its highest point?

  Suppose a ball is thrown straight up, reaches a m-;b jaakipxsj zs * whc+84/a7aximum height, then falls to its initial height. Make a statement/;kacb * a8sj-wa h p4s7i+jzx about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up,3pv pge3, i2:jtppo5b reaches a maximum height, then falls to its initial height. Make a statement about the directiop pg3teovj,bip5 2p:3n of the velocity and acceleration as the ball is coming down.

  Suppose a ball is throw z)p 5k( mv/pf86hjxqan downward in the absence of air resistance. Make a statement concerning its acceleratiopzkqa x(p h8j)5/6 vfmn.

  Suppose a skydiver jumps from a high-flying plane. What is her accelerati;cb ;7p( d-zgzg ud7bszq w,p3on when she she reaches t cd7b gzubqpwd;s7-;,zg z(p 3erminal velocity?

  A ball is thrown vert 4/fc7spm:aeylbb+0m ically upward with a speed v. An identical second ball is thrown upward with a speed 2v (twice asbsc+ m b40/la7epyfm: 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 dropp 0njyy )stg//xed from the same building. As time progresses, the distance betweex/0yyts nj)/ gn them

  Ball A is dropped from the top of a building. One second latpnf jj7i77twn(n 0c+kp.2 eqker, ball B is dropped from the same building. As time progresses, tnj.p(pkc qinw +72fn 0 kj77tehe difference in their speeds

  Two objects are thrown from the top of a tall bu po5+ ;igqqw* pkxh85oilding. One is thrown up, and the other i gikhpw*o+5; q5x8 qops thrown 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 buildinbhqmm ne85g(i5y 4; 1ir)afkw fms;n+g. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations 5qg( 5i4nm rfw)m +imbe hs n;;fk18yaof the two bricks.

  An object is moving with constant non-zero velocity w)edk s-0y0vj in the +x axis. The position vve y00j)k ds-wersus time graph of this object is

  An object is moving with constant non-zero acceleration inc 6f2m3yq,tgj the +x axis. The position versus time graph of this obj q ,jgcm32t6fyect is

  An object is moving with constant non-zero velocity in theg* 7+n3uj(7 br qkkoqk +x axis. The velocity vebn ku *(q+g7jr kkqo37rsus time graph of this object is

  An object is moving with constant non-zero acceleradzw9/(bcz b 9ition in the +x axis. The velocity versus time graph of this objczb( 9zdib 9/wect is

  The slope of a position versus time graph givesn nd*3 (sl*.qu3wtiu.r0xmpx

  The slope of a velocity versus time graph givsir6a,j ia/u- is1.su5zh674h hbyq nes

  The area under a curve in an acceleration veri5h)ztigthu jq/ v md.0(j00t;hhwl4 sus time graph gives

  The area under a curve in a velocity 8x)k+giaws*; y ) jlidversus time graph gives

  If the position versus time graph of an object is a horizontal line, the o3so) * dgdayo;d1c2ivbject iyi; g asdvc*) o1od2d3s

  If the position versus time graph jh8r;pc 7;sf aof an object is a vertical line, the object isr;j7ahs8; cfp

  If the velocity versus time graph of anznuw89fs 0fqog r td4un20e.+lfv o; * object is a horizontal line, the object iuon 0eqofvd;8rl+9g.fzt4s n w0f* 2us

  If the velocity versus time graph of an object is a straight line makcyz.-9 ad3dbgwd y)0r4v;a uydrn1 0iing an angle of 30 degrees with th duyr1nby.9v;0 dy)agacw didr 3-z4 0e time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. 7 tpm:* 3/mnacukl9.eeqbf 0l Find both the distance traveled and the .7ue/nlafme :m * q9lcbkt03pmagnitude of the displacement vector.

  A boat can move at 30 km/h in swe d09 if46bmr;su ,c +(squkhtill water. How long will it take to move 12 km upstream in a river flowir f 4wis6q(;hduu,se k9 0m+bcng 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 16a,a3uv6 j3 uwmvzp 6m(09 m)

  What must be your average speed in order to travel 350 km ,1,r g;2u 1fd1)y ao3ajsqbu +huunarin 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and zbdz .*qt j p5r+i2*bui5i) beeyp*- w57 min. What is the average speed o*z5w.b ej b 5*pt bepiqy2z)r-iidu+*f the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 4004y+o4 e pko o6yk/-pkm km?

  A ly (light year) is the distance that light travels in one year:nvnhklj4 ;ze. mi6 j/. The speed of lightk:; hn zjnm4ej /l.i6v 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 stryvf/-ylgqh 8es6 :qwvy7 )ovaof3 (2;; thcqmaight road and you look to the side for 4.0 s, how far do you travel during this inat; (y/o2yf7ahe;qv w3)mqc8h-y6:gs o vlvq fttentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 p v-d.gw13:lw 8:aerfbks )xps, your average velocity igpasel.)v:w 8pd wb1-r: 3fkxs

  A polar bear starts at the No6d0lktrr oi w+v1c (k u:0p*uirth Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to ri*0 kv 1ptu6 +orcu0(lrkid:w eturn 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 travels 1.0 km south, then ( mdzei9d3- t2 tu9p8nrk 9pfk1.0 km east, then 1.0 km north, then 1.0 km west to return to its sdpu98tmdke fr( -t9n 2k9pz 3itarting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school atcg424 rtt4i2cuiu ey5.2pkpl 55 mi/h for 110 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 fromc24irp5k 42 e4cult. yt gipu2 school?

  A motorist travels 16ssgg9y iqf j(b;,75 du0 km at 80 km/h and 160 km at 100 km/h. What is the average d9s( jfygq bu7ig5,s;speed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at cv n);r.z,cp r100 km/h. What is her average speed for the tripc zv);.prcr, n?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h ()o.*igw twv u;*dka hnorth for 750 miles. What is the average speed for th(wwi u gtovkad*;) .h*e trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) for t2ido,8 cdtc97yaz ;x 2gv azj7eam 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 Avat2zcd,7og i x8j;7az 2cd 9y runner not lose the race?

  A car decelerates uniformly and comes to a stop after 14 s. The car's average ap w/:w mmw/koy1p;2evelocity during deceleration was 33 km/h. W ;mwa/yp 2ewk1/ pwom:hat was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160:m) vpft zg7u;ew-i167cq, jz-yyuiq m/s, at the average rate of y-uui mf) 1-y epiwcqq:7j7zvzg, 6t;$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates.:5cu*(9xbg tbmdvqq);taw .f y w6jf 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 res/uof2 ml;6qi p)i*xsdt 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 ac09fwn p(l e+acceleration of a0nce(lf9p 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 of 4.2 m/s experiences a constant acch18 r aghgxw6c:i 5i.qeleration o65i:g xrhc whi1g 8a.qf $2.8 \; m/s^2$. What is the cart's displacement during the first 7.9 s of its motion?

  A bullet moving horizontally to the right (+x dio96 ryw i,zai:+c.xwt rection) with a speed of 204 m/s strikes a sandbag and penetrates a distance of 22.30 cm. What is the average acceleration, izcwxoayw:ri i t9 +,6.n $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. It rea-lygeprb2xj+i l30 /:2wr d mpchxm2eil2/pr:yw0rgp -bj+dl3es 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?

  A car starting from rest moves with9, pg6hyg8i5 lc5u1kk,eds lm constant 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 disrn ygg 6ve;:v.tance of 200 m. What is its average acceleration?v;vrgny 6:.ge

  An object starts from rest and undergoes unix y-zi x-mcmc8w d8hljs/c/- 3form acceleration. During the first second it travels 3.0 m. H-/mdcw3cx8 xc l-i8-mjyz/s h ow far will it travel during the third second?

  An object is moving in a straight line with constant acq -owszi6)ilzivu* . 5celeration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 1* - wvzoi5li )u.qzi6s0 m/s. How far does it move during this time?

  A car starts from rest and accelersojp7.jp c*im);x+o gkdr;7) 0koj x*z +a unhates 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 tiressy x/ve8ny xsqk)87zop;1+ pp on 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 has been waiting at tjkwpcxf d6c,w*7 (b+e he inters, 7wkb*ep xw dj+c6c(fection starts ahead with a constant 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 ;qpg2azt3r(b: qfcl3 speed of 12 m/s on the surface of planet X where the acc2 clf 3 g(;qt3rq:zbapeleration 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 fc7 s rm5filbp4 vpa+4q9 eh6c3r1 ,tathe surface of planet X where the qi97l3t1 45pfcseafr c+b,p4r h am6vacceleration 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 on the surface of planet X-e 9+-bjglagm3n2 y/j4 wxlz)/rukpq where the acceleration due to gravity is -g)3e +u4 /q m-plakwnjz2ryg9b jl/x$2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

  An object is thrown upward with a speer5bbpb 0lv)r 2d of 14 m/s on the surface of planet X where the acceleration 0)vpb2brrb5ldue 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 frienj/swc v6a(zkka s.l/t9em ng6 )ili4 0d holds a ruler between your fingers a( lwsa4/)6l s0zte.k9/k g6ijmcaivn nd 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 h/6 za;mnagv;3ag 6hm;v n;z/a.00 s?

  A bullet shot straight up returns to its starting point in 11 s. What i ,y ,debvjxs(1s the initial speed o,v,1se(xd j byf the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does 9+-kfy1wr zpg.k4 row it take to return to its starting poing+rpy o-k9wr w kzf41.t?

  A ball is thrown downward from thevy :n9di7ap*q. qlc6a top of a building with an initial speed of 15qaaqn l7iv* p6d9y.c: m/s. It strikes the ground after 5.5 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill d7rw ;i4b4z- a(s;zl3i5soda0dc ikq in numerical valud4i sqo4-;7aw5 clzab0iis;d3 ( rk dze in 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 xr h-/ump gak/) (e)boi 86akvup into the air with a speed of 23.9 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 10 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 10.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the vekbwtar egmtj.,i.gr) 8w8 r4h/v8 +halocity at t = 1.0 s?

  In Fig. below, what is theo1)7jzw + umef velocity at t = 2.5 s?

  In Fig. below, what is the i8(ij dq*q 8fgvelocity at t = 4.0 s?

  In Fig. below, what is g)2olohpfd o; wse, q( z:ys;.the velocity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 t e+acs +(x+) rhbgo,h/lmh;zao 4.0 s?

  In Fig. below, what is the average velocity fromp1p hyhpdd h4k j( cim3;mf1/+ 0 to 6.0 s?

  In Fig. below, what is the acceleratio:qzk+7 g -5uk gwvfm(cn at 1.0 s?

  In Fig. below, what is the accs 3d ik3,u9e2f7iss uheleration at 3.0 s?

  In Fig. below, what is thph 8;gev1 7iree average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to nue* g3v.kfj zw03 0nu8.0 s?

  In Fig. below, what is the diu2.zdc;:o5uhp7p ckkzyp- ; esplacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity?ancc+ z 2et*yi7l/fnzx2 uptji: 9-; u4as+if {speed|velocity}

  An object can have a e u3vpdzcz-s7+ pm;8t 7wkcn o,)s9cuvarying speed if its velocity is constant.

  The velocity of an object can be 1 bg7y.jdssj ho8un.4negative when its acceleration is positive.

  If one object has a greater speed than a second object, the first must have a ,41r wmg 0p,lhiqu7m bg mt-i;greater acceleratr gqmtwi m7,u0lb, mig;-p41hion.

  Two cars emerge side by side from a tunnel. Car A do;yvqi o3) l1ql+x;dis 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 speed as its accelera2zqehs ;u;kqxu6 oc+.tion decreases.

  A baseball player hits a foul ball straight up into the air. It leaves the ba (t zu qn)bbroo,,pfjx +q6l(-t with a sfzrblt-)j,(,q o (6o bxpnq+upeed 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 accelerat 7qa;la90f vugqs oqq4i .w9(oion, how does it change if air friction woa9i9f.qa47ql(gqv q 0so ;uis ignored?

  As a freely falling object speeds up, what is happening to mtlu r/.rv1e8gq0 4.c+ pbos cits acceleration, how does it v.to spb4+urem g1c .l/c0qr8change if air friction CAN NOT be ignored?

  An object that is thrown vertically upwararg*+:m2w /o)i o xugct.jl .ud will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be al: )o.2rujw*/o at.cg+lm iuxgtered?

  An object can have zero d3dzx,um-; o qe4pp p v(p7fa,fi/wn) velocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the same y7; p aof bh+dkk.dxs76 n25mftime.

  An elevator moving from the second floor to the fifth floor making no stops alo)bti ppr9-l 20qeer4i ng the way has zeeil prr-q09ebt 2)ip4 ro acceleration all the time.

  A rolling ball moves fromnk g0c4 6d)xiv aw)p4h $x_1=2.4 \mathrm{~cm}$ to $x_2=-8.0 \mathrm{~cm}$ during the time from $t_1=1.6 \mathrm{~s}$ 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 $t_1=-4.8 \mathrm{~s}$ is at $x_1=2.1 \mathrm{~cm}$ and at $t_2=3.3 \mathrm{~s}$ is at $x_2=8.1 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a qua*7ou5uj .owsk)l6ecu rter-mile ($1 \; mile = 1609 \; m$) 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 from its trainer in a straight line, moond ctq26 vp94ewajzx54yke,,6 3sgq ving 104 m away in 9.2 s. It then turns abruptly and gallopsn o6,45dpkzjwv642q9q sac3gytex,e 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 frml:xz 5bh-6- srw(u.r og: vxqom $11 \; m/s$ to $23 \; m/s$ in 4.9 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 froium (v / x1wg3gcml+iqkmr+; (m $21 \; m/s$ to rest in a distance of 85 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spee.xytgy )+ i9hbd of $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.1 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top spl l,0cs ne 6hg/c68yvjeed about6hcyn 6vsg0l,/cej8l $11.4 \; m/s$ in the first 15.0 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 spy0ke(q 0h f3c8tr5 o9;p,th8r l nyrxxeed of $19 \; m/s$ to rest in 4.74 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. Assuminjnoevek .t,,qbejy0c f ,du4t*3q n,)kfj *g4 g a deceleratio4 g,ey3*ekjo 4.q,0)fvc d, ut *n ejnbtjfk,qn of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going t v-t 1 f;wae 9x7o oi5qyorej5gpq7/9$25 \; m/s$ 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 uei8ugn2jb6310,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then acceleugj3e2n8ib 6 urate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$