Suppose that an object tra/ labskvwc2gtvv, 22ap-*v;r vels from one point in space to another. Make a comparison between the displacement and the distance trs vrbl22vwa; ,-v/kgpc t*2avaveled.

  When is the average velocity of an objectsxebj0z0 ; -hx equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zeral5(iq+er; nqm 0we u+o to sixty in 8 s". This is a descripti +0rawun+qi;e5 eqml(on of

  An object moving in the +x axis experiences an acce gsmfsr8w:yjz /410lxleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to)vu*mjj yd .yg- )v.xd the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleratd)y*vy dxmuj. j -).vgion.

  Suppose that a car traveling to the West (-x direction) begins to sllc2umarjg*ib 1( .p5 iow down as it approaches a traffic light. Make a statement concerning (pj climi5g2au *rb1.its acceleration.

  Suppose that an object is moving with a constant veokg e)s dtc,6i::xl:plocity. Make a statement concerning :)t:xldpis,kc:oeg 6its acceleration.

  If the velocity of an object is zero, does it mean that the acceleration iuf*;,y 08xwz g*nvjels zero?*len z*v;0y8 fjgxwu, Support your answer with an example.

  Can an object's velocity change direction when its acceleration is constant? +xsgjym 6u0n*zkl1;u Support yourn6u*j+su;yz 1mlx kg0 answer with an example.

  Suppose that an object is moving with constant accel/r8p k-,z9bg3bjzv r veration. Make a statement concerning its motion with respect to t9v ,3bg pzvr/zk8 r-bjime.

  Can an object have increasing speed while its acceleration is decreasi5hr.2k, /rnmana0bz cng? Support y 2,nbr50 /hmacz arnk.our answer with an example.

  Suppose a can, after an initial kick, moves u,,0evtz 4vh)1zzkbmyp along a smooth hill of ice. Make a statement concerning its acceleration4,ez )vvz t1hk0bmyz,.

  Under what condition is average velocikl a.0gyq;f +yty equal to the average of the object's initial and final velf.y +qa;k0 gylocity?

  Objects A and B both start at rest. They both accelerate at the sabih 109fbgcqoni d.36m.xa40xqv o g-me rate. However, object A accelerates for twice the time as oav hcb3b 01ofn igqq4o-. 069 x.xdmigbject B. What is the final speed of object A compared to that of object B?

  Objects A and B both stai)+z n mk1uv3uj*ci7art from rest. They both accelerate 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 ovi1n) c*+j izumuk37abject B?

  When an object is released from rest and falls in the m 1p8e eojzm:8 /cssk)absence of friction, which of the following is true conce m 8z1okp) :es/mcs8jerning its motion?

  When an object is released from rest and falls, l-lxyuu9pq04 ymf) qy*:mjj in the absence of friction, which of the following is truejx:-p mj)quym0,l4fuq*9 l yy concerning its motion?

  Suppose a ball is thr7iozc43 fps/j2jksxs1 iy7i/mp;y-m own straight up. Make a statement about the velocity and the accespiyp/ -im/j1mic32 sk 7 j74 yx;foszleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration juv4ewf/gdk.ob(, ga: y-hk,fdm)iv 7i st before it reavi,d.d wf7 i-kbke h,gfvy g(a:o)4m/ches its highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, th-qqs-icjy7 (ob h ;ws-en falls to its initial h--hw-iy;ssbo 7 jqcq(eight. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reab0:z(n- s qdmx vly6bm:emtxfe0);iti76s q/ches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleratizqmtf/ xvbd-tbe;q6 7se:i:6 nsiy)m0l m 0(x on as the ball is coming down.

  Suppose a ball is th pa :e/hfc,w-qrown downward in the absence of air resistance. Make a statement concerning its acceleration.- :qpfw/, hcae

  Suppose a skydiver jumps from a high-flying plane. What is hfh3. x6 xqk27n +c rnh5qczj 5ymm02eaer acceleration when she she reaches terminal vernqnk3j5m2 5mxac 0 62hehc.7 zxqyf+locity?

  A ball is thrown vertically upwtg2s) kbq e())s ;xxdr.k+jpv ard with a speed v. An identical second ball is thrown upward with 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 g)br+ktq2s) xjk.g)( d;xes p vo than the first ball?)

  Ball A is dropped from the top of a+h vbk7m;e.a3t o;con building. One second later, ball B is dropped fro7n k. ;3vhmt+co ;aobem the same building. As time progresses, the distance between them

  Ball A is dropped from theckz+sh s7/5dx5olnxzus(3v 2 top of a building. One second later, ball B is dropped from the same building. As time progresses, the difference z+hcv oxz 5kx /(s52sd snlu73in their speeds

  Two objects are thrown from the top of a tall building. One is tbhw skf0 -tci* bk7;wi8*4ysrhrown up, and the other is thrown down, both with the same initial*k;8hscit wr-y7 bk04wi s* fb speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thr 0 t;4k9 nbk(asaust-pown straight down from the same building. They are releask9a- 4b(stpka 0sunt ;ed at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constg /cxd;ejfu )0; ozjq ,th:ny9ant non-zero velocity in the +x axis. The position versus time graph of thidc ounex/tjq g y;f ):j0z;h,9s object is

  An object is moving with consta:1prn()5hceu lyp ((1pens prnt non-zero acceleration in the +x axis. The position versus time graph of this object 1p rp( spu(:5e( c1)heyplnnr is

  An object is moving with constant non-zero velocyoqwwtaoi m4) .9c5l 1ity in the +x axis. The velocity versus time graph of l mcwqao i)w5t4 91o.ythis object is

  An object is moving with constant non-zero accelerationb/1 y:lsw.wvtt 5wh, i in the +x axis. The velocity versus wwytb:i, l s1/htw.5vtime graph of this object is

  The slope of a position versus time graphsteesz.mqljeocj (2(92t:3q gives

  The slope of a velocity versus time graph give:6ha/mvg fwk-s

  The area under a curve in an acceleration versus time graph gi qft5(ht*w7w* sj+ lafves

  The area under a curve in a velocity versus time graph givh57;w 3gw s7.5vvr, myqjvzzx.jxsc r26et:ves

  If the position versus time graph of an object is a hordxcv(y p;g (wdj+,lq5u2z wr2 izontal line, the object iw cvlqp;2(x,d(zrgu+ yw25dj s

  If the position versus time graom,+ neqr jine*+l:a*(krh; o8j1p sdl* 6bomph of an object is a vertical line, the object isj*,pobhn8n okl+;m1rmi r dao* ( s+leqe*6j :

  If the velocity versus time graph of an o sudr ax2p 3a;mdg) 39y.1uo+oku:ux bbject is a horizontal line, the object iso.)m1ps 2x3kxga+d rbya3uo:u du 9 u;

  If the velocity versus time graph of anm4 s *mjt5 /xm9md5hw,xxqp -w object is a straight line making an angle of 30 degremm -5 mdm x*tpsww9 j4xq,x5/hes with the time axis, the object is

  An object moves 15.0 m h ,gtr+4 h6-buo t1opgxv 601seul-yonorth and then 11.0 m south. Find both the distance traveled and the magnierxh-6 - u 4 usho+t0vgl1,16oopyg tbtude of the displacement vector.

  A boat can move at 30 km/h in still wad1:4s1g9r w ogowksu u+0nte 0ter. How long will it take to move 12 km upstream in a river flowing 01ougt4grw1 +:uwskoe9 n0 s d6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 16 ,, rgjflnxk,009 m)

  What must be your average speed in order to travel 350 km in 5.b ils876y*0tezgc71l ) f*up4e f phte15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hou3qu) *f tvrig6rs and 57 min. What is the average speed of the runner in v it*ur qg)36fm/s?

  A car travels 90 km/h. How lonn )y bu lo3eyyq*/goi(j ;o)axzas4 ,4g does it take for it to travel 400 km?

  A ly (light year) is the distance t d;u( rxmczvl7 l;5q0ahat light travels in one year. The speed of ll5l7(x0v;qmcrz a;d uight 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 straight road an*o2d bd d: wywvki+(2jd you look to the side for 4.0 soy dj i(2:wk2*dd+ vbw, how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 mmn8 l go)t3gt1), in 100 s, your average velocity istg81t ml3)g no

  A polar bear starts at the North Pole. It travels 1.0 km south, px2,my6m;p (/aw .dnggi qrd9then 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. Wyagqi2p;/ dr,dp9 6w m.( gxnmhat was the bear's average speed?

  A polar bear starts at the North Pole. Itb)-8yv ps f6sicqa09: mfrj28 evj nh..arv-e 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 takes 45 min. What was the bear's average f- sre 9.2fcv.iy bhjpr )evam6-8q:8 ja v0nsvelocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. It thm.blxeev-mz1v2m g5 w)pu1o(h1kt l 8 en starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How faemh v5l81u 1gt xk )bl-m1 (o2mevp.wzr is your hometown from school?

  A motorist travels 162vwse*.g+ psi 0 km at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist foris+*pg . svwe2 this trip?

  A motorist travels forj s4e 0 rna5q:4zw/ndf 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the trinn4zs r:/ qe fad4j05wp?

  An airplane travels a -3p tjqczfww ps-)-67m8obtvt 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is thesfc vmo) z -j- qwt3687ptp-bw average speed for the trip?

  In a 400-m relay race the anchorman (the t1); b pyt4n 6r;codx.f ;j r(knqbr/jperson 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 th1p;/jk6y(4b;tcf.q jx tndorn brr) ;e race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes twhwegm08, + .zuir1c c/a0xxgo a stop after 13 s. The car's average velocity during deceleration was 46 km/h. What was the car's deceleration while slowing down?.e08hrgzxw/ ,1 ucwcam 0gi+x

  An airplane increases its speed from 100 m/s to 160 m/s, at the57u1icxrsx3)j n3 bpd0ljjk : average rate of xp0b1ul33ir7:j)j 5k scnjdx $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the r0u+ p)bmdg(q/ p3hcf8l+dv lo ate 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 ands7h6 ( i;weplr 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,jq;i+g+dad h speeds up with a constant acceleratioqag+ +,d;jh idn of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initiak2u(c*p s -bexl velocity of 6.3 m/s experiences a constant acceleration of ( -uk*p cxsb2e$3.8 \; m/s^2$. What is the cart's displacement during the first 6.4 s of its motion?

  A bullet moving horizontally to the right (+x d cun (8dnz1 su3m66mivirection) with a speed of 592 m/s striv6s di 1mun38mz6c(nukes a sandbag and penetrates a distance of 75.48 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft c6vqbom5d2gr0y er2a 3+tk n,yarrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constantg,dmy05ev bn aytk+2o2rq r63, what is the length of the catapult?

  A car starting from rest moves with constant a( (t*ojd*8 :dpky :xcndnot*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 2mxoo66v7 s a e5vn2lh*o2th pn9:g(sq00 m. What is its average acceler6v:m2vx ohq2(*s p59 nat7ho6ogse lnation?

  An object starts from rest and undergoep *wt/(f;al4 w nueoral b99b8s uniform acceleration. During the first second it travels 9.9 m. How far will it travel during the third second?a99/lron8wwf;(ub4e b lp ta *

  An object is moving in a straight line wv87h+ 9yjcs)on )vw bxith constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How fa8c nyo7 )v9xj)bwh+ svr does it move during this time?

  A car starts from rest and arxepjqsyosl,f)d.hzu /3z* o- - 1jn4ccelerates 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 rov y- loie+o.g6ad 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 tpzt(:s8c wc 7light turns green, a car that has been waiting at the intersection starts ahead with actpt z (s87:wc 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 speed of 12 m/s on the surface of p-v e08wqio x3;km74mw cmvay9lanet X where the acceleration due to gravity is 8w3x w4om;qy v0mek97a-c imv$1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of 12 m/s on the ye*+ ,vi1v*ycw0vfihsurface of planet X where*f ycv+viie,w1 v*0yh 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 on the surfahd3wx. wk(xbbdcuczy1 g)g4-7(ocx ,z1 o z-rce of planet X where thexd3 1-cb,(.ou)zxhc(wowd-zc k x1g y47rgzb 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 si k t4au.fjfc( r,m+f6wt yy*0peed of 14 m/s on the surface of planet X where the acceleration due to gravityrfu4y0k +a,ft wmf*( c.j6t iy 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 yoys3c7o 1j pa/gur friend holds a ruler between your fingers and releases it without w/7a c 13jposgyarning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a vhr8tv:j d +p2us1ift,kqrl0,elocity of 19.6 m/s. What is its velocity after 3.00 2fd,v:kr+l 1js 0hr tq, upi8ts?

  A bullet shot straight up returns to ite g,j fj+u6 yok9atg7,s starting point in 16 s. What is the initial spee9+6 okuyt7agf,j e,gj d of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take5elrb.y23;qz 6f, h2hdw ;qj x ;tglpx to return to its starting point?r2y ex5 .b,p;qqd zl;gfwh 326 hxt;lj

  A ball is thrown downward from the top of a building with an initialmaf7vn n3j)h+vkzv8e 7vo 40 m speed of 12 m/s. It strikes thenkvm4 f)vajv7 nehv0z 87+m o3 ground after 2.6 s. How high is the building?

  A ball is thrown straight up q6 8p0f nhsf7uwith a speed of 30 m/s. (only fill in numerical valf8pu06n q f7hsue 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 up into the air withx)rq1 dclfj2+ a speed of 41.1 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 7 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 7.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velo26 -9i4j3i69qz2p suukfps oqz ns,zfcity at t = 1.0 s?

  In Fig. below, what is the velocity atbhmzi m7jmqy,8kwu0k *4;s(z t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 7tvnsh03 lf 9ls?

  In Fig. below, what is t/rvz:j*, w btdxo1kpsw , :i,fhe velocity at t = 5.5 s?

  In Fig. below, what is the average velli4e* m sq6mg(ocity from 0 to 4.0 s?

  In Fig. below, what is the average v crd45bqx/p3y elocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration )vdfm tn7 k53 :/n3v z.uhmbtwat 1.0 s?

  In Fig. below, what is the acceleration at 3.0 snd,r/.9d7mksr6ei3.ra p6p 5 tfchgz ?

  In Fig. below, what is the average acceleration from 0 to 5.0 sm69 py9e86du fsjrod ;?

  In Fig. below, what is the average accell( y0mvnb3 et(t*s8 kjeration from 0 to 8.0 s?

  In Fig. below, what is thyql*lfg)yk o,wc u( 7,e displacement from 0 to 8.0 s?

Does a car speedometer measure speed,.y f3ta /1 yipoik9,(;e 7/ audvsnir:xw) uge velocity? {speed|velocity}

  An object can have a varying speed if itsze3o9 mu8ves/y5 v6q05 ywk m 7i8rnuw velocity is constant.

  The velocity of an object can be negative when its acceleration is positiv*1:ax( gs(rcn;i)b mi2uiygx e.

  If one object has a greater speed than a sec;zpa;c+n n aw1b t)-16dg 86xqypnvzqond object, the first must have a greater accelerat; n-xa)bzc;+ w p1n vn1yzd8qpg66 qtaion.

  Two cars emerge side by side from a tunnel. Car A is travme)3*yftref wk4 ry9-eling 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 i.ew,/soy( p n7ng 0sddi6 3jqbn speed as its acceleration decreases.

  A baseball player hits a foul ball straight up int gcezf4;bty3 9 gmu)(to the air. It leaves the bat with az)gtu4eby3f m ( ;ctg9 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 acceleration, 5ddgh id*edz 2x2 dkkld8fb.cva lo+,;;p8 y 7how does it chod7k*.;2 8;kd +v lidd5gz28dp fdx lac,yhebange if air friction is ignored?

  As a freely falling object sj9 e(-cp sli9s:, ydtvpeeds up, what is happening to its acceleration, how v -c estj:d(p9 is9yl,does it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its orish,.8,yg2 /lawifror9a b1q wginal position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will9ri2 qa /sha,.r,wgo8yfl b w1 this result be altered?

  An object can have zero velocity and n/).5mnhh uw nsonzero acceleration at the same time.

  An object can have nonzero velocity and zeoxfx8a6sn rre,pk f:v.pfuaj m1 w2n31--nk;ro acceleration at the same time.

  An elevator moving from the second floor to the fifth floor mak(m gt2f(wp s) 3 ndgr6n5*kqogs 6jx-ping no stops along the2p fn sw(xqd-)g6*pj g (ng5sm63 rkot way has zero acceleration all the time.

  A rolling ball moves from4-x6*mq .z*,jqqcavy) f riprsz( m2s $x_1=3.3 \mathrm{~cm}$ to $x_2=-7.7 \mathrm{~cm}$ during the time from $t_1=2.3 \mathrm{~s}$ to $t_2=5.0 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.6 \mathrm{~s}$ is at $x_1=3.2 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ is at $x_2=7.7 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-mvqt kwi: 0.+tz .tjkg9ile ($1 \; mile = 1609 \; m$) track in a total time of 12.4 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 straigh+*uz*flbpcc mm(ss 7b8*npg)7t2 wq ek2pv+ mt line, moving 115 m away in 11.1 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate (a)2 f+qbc( *pve7tz ) unpkg8sm*smlm *72w+pbc 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 from4xh* (qp*fdd1e s6i py $12 \; m/s$ to $25 \; m/s$ in 4.7 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 hgl h 8sp-cg5;k/qfa ;$18 \; m/s$ to rest in a distance of 78 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of cz raai1y)c: uj1 9wm($26 \; m/s$ 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 the blocks to essentially top /v4yvczor0e;zz ,y (w pt 4kdccu.+k8 speed abouu;r/(kz.40woezc, 8vy ptk4y+ zcd cvt $11.1 \; m/s$ in the first 14.1 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 fros. i5b 2ta wy0up3oas;m a speed of $18 \; m/s$ to rest in 4.26 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 )i*dj*,bmwadid,k + s the highway. Assuming a dedamdi+b **,djiw )sk ,celeration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck * dpmr7ndx1*jk0 1 xbhk.a1mn 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 bto8.p a j6,:pseyl1kin less than 30.0 min. After exactly 27.0 min, tp1e: 8y6aklt.op,sj bhere are still 1100 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$