Suppose that an object travels f4aq fvg4yjykigs54 : .ay ;fq7rom one point in space to another. Make a comparison between the displacement and the distang4:5j yqa qyakf. s47f;iy4g vce traveled.

  When is the average velocity ofjr6:g*o qe, zo an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can gob+2m e71q ey hnnp/ ip06nv/bf "from zero to sixty in 8 s"1 qnn b+i ebfv72/y/ m06phenp. This is a description of

  An object moving in the fek3x(0h:z( nf+bymd +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) begins to slow d4no hsucz u8jvio8, ,3r:dk:b own as it approaches a traffic light. Make a st,h: bd8jn:su3zokou cr 4v,i 8atement concerning its acceleration.

  Suppose that a car traveling to bs pxpj3086d8 zhl 3:kbi5,r zy77vr3 mf xwlsthe West (-x direction) begins to slow down as it ahblwj3r5y 6b,df0lmrz 3i7 z7x8p8k s3:xp svpproaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a state3ere *9vbivkc/ x z/hra:( bs-ment concerning its acceleratiih rr v:zcs/-xbe*k(va 93be /on.

  If the velocity of an object is zerok*(xvix,h/yj 5 fd, l,mrn2ir , does it mean that the acceleration is zero? Support your answer with an examplfi5iv(h,x,,rk2dn*y /m j lxr e.

  Can an object's velocityefahx,(jv* 1 y change direction when its acceleration is constant? Support y(v jah1,xe*yfour answer with an example.

  Suppose that an object is moving with constant acceleration. Make a statement d8t/xvs t5h7obda;i 0concerning its motion with respo80;t xsi7d/t5vdahb ect to time.

  Can an object have increasing speed while its acceleration is decreasin1a g1swe3cg/ vg? Support your answer with an s1wg3/g a1cev example.

  Suppose a can, afterzib e8 ,z8qpshfe mn,ur g:g96i2)vm , an initial kick, moves up along a smooth hill of ice. Make a statement conzp,gmq8eh,s9fei)zu 2 i bvr6gn,:8mcerning its acceleration.

  Under what condition is average velociv+txj8e hf)tci1 do-(ty equal to the average of the object's inih+di-fv( cetx)1 8tj otial and final velocity?

  Objects A and B both start at rest. They both accelerate at thk0lsw 7f 5i6uhe same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of objf5uh0ks w76 liect B?

  Objects A and B both start from rest. They both accelera88 nxodzqi))k- map*z te at the same rate. However, object A accelerateox) * 8ka8q)dmnzp-i zs for twice the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the a0/ 9 wid6p8hpcr(aakzbsence of friction, which of the following is true concerning hradp c8w6( 9a/zi0p kits motion?

  When an object is relk2qoqpxi ql64jt7x6 v) 97rak5ua 5ueeased from rest and falls in the absence of friction, which of the following is true co paj)4 au k 5qqeqxkrix2to6lv977u65 ncerning its motion?

  Suppose a ball is thrown straight up. Make a statement about tha t++4 wnepbg*e velocity and the acceleration when the ball rebgp* ne wa+t+4aches the highest point.

  Suppose a ball is th)j sxnczw9g+1 bo.tq)rown straight up. What is its acceleration just before it rea w)t 1bcsx)+go q9jz.nches its highest point?

  Suppose a ball is thrown straight up, reaches a maximum hehs r.29luv64xi 5iycg ight, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is4ghic5.9y6ri uvslx2 going up.

  A ball is thrown straight up, reaches a maximp016m ;ntuna mum height, then falls to its initial height. Make 6;tnp0nu1 amma statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is throy4h xk+5fzz 0cwn downward in the absence of air resistance. Make a statement concc kz504yx+fzherning its acceleration.

  Suppose a skydiver jumps frolm47er te5,,qv8e n+k nxc idza hh+37m a high-flying plane. What is her acceleration when she she reaches term 8+i,nm+e el rxzhkc hv74atnq73e,d5inal velocity?

  A ball is thrown vertically up+y6-pt+et kb xward 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 heighteb6tx++k-typ 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 gaxd35,.q2+mu fvnpfof a building. One second later, ball B is dropped from the same building. As time progresses, the distance be+ngp.53mavxd 2ffqu, tween them

  Ball A is dropped from the top of a buildin .exx (5, y/53j s cqxsgncuaav7ze)1qg. One second later, ball B is dropped from the same /eyq g .xasvuqaz7s,1 c cexxn5(j)53building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. Oney7 -85cp(rx :rpnr *hicpq+q k is thrown up, and the other is thrown down, both with the same initial speed. What are theiq:85 c krpp hqx *7pr+icy-rn(r speeds when they hit the street?

  A brick is dropped from the top of a building. A second b7fqvj(ms3bz: x e3*kll0t7 r nrick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bric 7(rfll3t: *k7 e3 nqjx0bvsmzks.

  An object is moving with constant non-zero veh m o1j*oujmkt4 5fd65ltzs33/lus/ dlocity in the +x axis. The position versus time guss hz3m51jj//m5od d*otkf3lu lt 64raph of this object is

  An object is moving with c:df6ccu)92;9d q: u aeeaxkgjonstant non-zero acceleration in the +x axis. The position versus time graph of this obje6 : 9uxgda:q9dec)ju;2 f acekct is

  An object is moving with constant n+virvwh,tc)/i o szy.;6 pq tt882bjnon-zero velocity in the +x axis. The velocity versus time graph of this object qt+ho z6jstv2)r.wt ,8i/ ;vncbyi8 pis

  An object is moving with )y pp ktf6;maqa26f5vconstant non-zero acceleration in the +x axis. The velocity versus time gr6;2 p6f 5aqf aypvtm)kaph of this object is

  The slope of a positioo )uos -dd t9n)x.q0bau p -m47:thwezn versus time graph gives

  The slope of a velocity versuxup q,g15rj q1s time graph gives

  The area under a curve in an acceleratioeai6b ga-h td1+m7;i yn versus time graph gives

  The area under a curve in a velocity versus time graph givesh(maw u.hf l)ktg2a+: hv (yy7

  If the position versusvo9j- f5wgb abg. .wf1 time graph of an object is a horizontal line, the object is19ff .og-ww.gbab5j v

  If the position versus time -i wr 1m6 (2n jqic ik)6d4n:khzw3vzqgraph of an object is a vertical line, the object ism42)hjqrvw(:nkidnw-z i6ick6z31 q

  If the velocity versus time graph of an object is a horizontal line, the objeijksfldg,m1/nie bh6 r b 38c 3vnm;-u(pf*b0ct iml0vi8n fdfrei3jm6 hpbg; /*3bk cubsn( -,1s

  If the velocity versus time graph of an object is t uhyvv ;5uv8ahbn:9at2 y9d; a straight line making an angle of 30 degybv u:;n t9d vh5a;t9vhuay28rees with the time axis, the object is

  An object moves 15.0 m north and then ea hztq+4ol,*sawz;f7 v c6 a(11.0 m south. Find both the distance traveled and the magnitude of the displacemevq(7hoc stl; azaf4e*+w, 6az nt vector.

  A boat can move at 30 km/h in sxx 0c(mylif13i;u 0d rtill water. How long will it take to move 12 km upstream in a rivc ;d l3(xi0f1mixru y0er flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 me 4u;l4a 2opml,t8: uyyy5 uka)

  What must be your avera2nc6rb xq rt*6)4wr t2dsr 8vege speed in order to travel 350 km in 5.15 h?

  A runner ran the marathbb/(fw)un3 d(nfj(6e7n ft seon (approximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runne6(f7jbbsnd n we(t)3( fef/ nur in m/s?

  A car travels 90 km/h. How long does it take for27f(huw*) ceytf ;kfp it to travel 400 km?

  A ly (light year) is the distance that light travels ins i:w7e /o*k2ly xxv,zj 8ygw, one year. The speed of lig7xysw , y:v,8lo wxi*j/gzk 2eht 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 ac p0tl dhe9(em-me e. r/k*hv3long a straight road and you look to the side for 4.0 s, how far do you travel during this inattent v( lmmh/90ect .e*rd-eh3e pkive period?

  If you run a complete loop around an outdoor track (400 m 0wjkknc;crdac:31v.), in 100 s, your averaga:n 3 wd1c0;ckcjrkv .e velocity is

  A polar bear starts at the North Pole. It travels 1.0 km south,qa4;4oalj)gc0x x2b k then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its startikjx4b2 cx 0l4o)q;gaang point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North q cy7 9,sk6qjztqy+; 4 c0mgc5ao2avoPole. 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 takes 45 min. What was the bear's average velg5c v9m ,6k+ y40qzsa oc7cyqaq2j;toocity?

  You are driving home on a weekend from school atbq7k3 1apkl8 ug98i 4jiiqe3u 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive hom7 i1jqiq4g8i8puk9be3 lka 3ue after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What irsh o 2kny*k17s the average speed of the moto sk n2r*y7hk1orist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h (4p4c ber.om(4 i*xrymza5mg at 100 km/h. What is her average sp rzaecm 4(x44p *oibm5rgy( .meed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/qdf*cm* y 6s wd5mr.+fh north for 7**yfw dc mq65r+s. dmf50 miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who v)e1n s x*tinzr+ s:g. ((hehtruns 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 the race, in order that the tea x*gzvr.(en(si1 ns+ h thte:)m A runner not lose the race?

  A car decelerates uniformly and comes toy ai y 0ee*t)z4ezlv/. a stop after 13 s. The car's average velocity during deceleration was 42 km/h. What was the c0z*)4/.ayve zete ly iar's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, atra,za75 zewbg2g78 qt the average rate of t,g2rzwq587 bz7agea $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate of x9p +a3 y+,v,rl o(thf llwcp2*nx 2vv$2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and acceleqvp ;k 5a6i( pn*wftq15xg gt(dp0ac5rates 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 hhkm9qz1- e1x s. It then speeds up with a constant acceleratione-kh91 zh qx1m 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 6.4 m/s experi7jwhv88s 3hazwx)z l( ences a constant acceleration of (8ww3 zz8 v)jh7lxh as$2.2 \; m/s^2$. What is the cart's displacement during the first 9.5 s of its motion?

  A bullet moving horizontallqksun :n8tkcg8:mwh 7k2.0yp y to the right (+x direction) with a speed of 412 m/s strikes a sandbag and penetrates a dwgy:: 0phks2 mc un8.kqn8kt7istance of 15.42 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launche(f),ru5da d mo5ev6z t zy*p8vd from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the eny dv5mtp8)56u r ,ozdza (vef*d 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 res6vj-+v pzbnjvr5 u2 (wt moves with 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 diste )ayytc7a16 ,etnkq ck:ys 99ance of 200 m. What is its average acceles aceyq6,taky )yncek:99 1 7tration?

  An object starts from rest and undergoes uniform acceleration. During the firwolpb8 blu)( v 6tiu04yk4 cs(st second it travels 7.0 m. How far will it travel cwub4t)(k6 pvy4u8i( 0l lbso during the third second?

  An object is moving in a straight line with constant acceleration. Initially -6epz1 x lrv:v)b je0tit is traveling at 16 m/s. Three seconds later it is travelin0j)t:1v p6r-zelxebvg at 10 m/s. How far does it move during this time?

  A car starts from rest and acceleracplov dvj-f/*f:j/9oe4 +mk0j9 m j zates uniformly at $3.0 \; m/s^2$. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at $5.0 \; m/s^2$. How long does it take the second car to overtake the first car?

  A car with good tires on a dry road can decelerate at about ch9a q wv*,oxl()ryna7 c1x h1$5.0 \; m/s^2$ 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 h r-; gsn8it w4gbvht*u0e+g. fas been waiting at the intersection start+0t i*hu;g nbgs 4rf- wge.8vts 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 wbo .qr,smcfa5. 1 -hygith a speed of 12 m/s on the surface of planet X where ,-q15fbmr.o.hy c gasthe 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 speed of 12 m/s on the surface of planet X .o:wvkdyig06k ,e; fewhere6 k;,evwdoiey:fkg0 . 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 onh1t2.apddh*. z6bkz;tez elyk00 sv1 the surface of planet X where the accelerat ze z61v p100t2lhsbakeh * yd.zk.d;tion 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 s9-0xe.lm13svoc w wi apeed of 14 m/s on the surface of planet X whe31icx.9 lovs0 ewm -awre 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 grd v(o - e+6ut3 zi9lzwkbe9f-weater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler tu9 zkwe36o+t -ew- dbv9f( ilzo fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. Whatd+tef m/ ls:mn:*+t, jag-/t: ucak vv is its velocity after 3.00 dt :attusm eak :fg/cl* vj++v,n:-/ms?

  A bullet shot straight up returns to its starti5m 2cxd8qz uivnqo 39-ng point in 11 s. What is the initial speed of the bullq nu 3zm-5cvxq 2i98odet?

  A ball is thrown straight up with a hm * dk(w*zvg)yyn krb- xu5+9speed of 36.0 m/s. How long does it take to return to its starting point? vm+zx*wg( 9dby*) k yu5rknh-

  A ball is thrown downward from the top of a building with an initial speedyfnx /w+las,2j9cf 8ptx5eqls )1 8vc of 26 m/s. It strikes the ground after f8cp t) jsfwelv1x9q/ayx 5c 2n8+sl ,1.2 s. How high is the building?

  A ball is thrown straw53x4 b)xzn/ 1vgyrkxight up with a speed of 30 m/s. (only fill in numerical value in the 3xxv)/51 ywzgrx b4kn 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 with tiz-zlo2)jq5n: k l k pbt5/ s5vg)wq0a speed of 43.3 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 13 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 13.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocit u a:gqocer - cnc,oq+n 4hu3;327kljky at t = 1.0 s?

  In Fig. below, what ik:;+r rvj g:6 q-wzczms the velocity at t = 2.5 s?

  In Fig. below, what is thets, lns0k:- pf velocity at t = 4.0 s?

  In Fig. below, what is the veloci*xjhz7 q-3nwyty at t = 5.5 s?

  In Fig. below, what isv4vf:hogs d5z 0 yvv98f 4xw.g the average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocbd 0.ck,d2 wflity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 s? a*y6;wqh:qm zac-+ wvf 7bf(bq.ooo7

  In Fig. below, what is the accele -eo24yjt8hlt ration at 3.0 s?

  In Fig. below, what is th-e z(ucs 3lir-9zs*op e average acceleration from 0 to 5.0 s?

  In Fig. below, what is the r6 5woo;mcxd6 average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement fro-cn 8c4djup kcv+9 gk4bo,jv2m 0 to 8.0 s?

Does a car speedometer measure spec scdajf)b 0hb (+dk/623mqoeed, velocity? {speed|velocity}

  An object can have a varying speed if its vwwl) n0zkc4:l*o8u qu elocity is constant.

  The velocity of an object can be negative when its asta i5 r*fw sn2kh6/3kcceleration is positive.

  If one object has a greater speed than a second objel8u1zbsixf *r. : qy *, ii.ghv3v)bjrct, the first must have a greater xb,8*vfi )v1 jybsr* gq3ihlr. i .:uzacceleration.

  Two cars emerge side by side from a tunnel. Car A isb))wgj j2;-udkfp* d iz7) pqv 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 incre(ml jlsn0 1k-ab*j7veasing in speed as its acceleration decreases.

  A baseball player hits a, kbrv9ned(j u(yw xi/ t48euoo8z2s2 foul ball straight up into the air. It leaves the bat with a speed 9j ,2y4k2 u u(8os vz 8ndotr/i(bwexeof $120 \; km/h$. 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 acceleratia6ejrh*r*,p cl4ae 3won, how does it change ipce **ej4,wa6h rr3la f air friction is ignored?

  As a freely falling object speeds up, what is happening nwpi xr30 ky:i u46hy:to its acceleration, how does it change if air friction CAN NOT be igyuy 0k4:w r :ixn36ihpnored?

  An object that is thrown vertically upward will return ty;7nfnt j tdj06lc* 5bo its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will th t*f0yt576nbjd; jnlcis result be altered?

  An object can have zero velocity and nonzero acceleration at the 4, fpkhw-jes8e/ww 1n same time.

  An object can have nonzero velocity and zero (do2k7mj( 3ua yxha( kacceleration at the same time.

  An elevator moving from the suz:o 82 d9r 6yi xw/+o5zzmtlgnnitf2b9w)v 7econd floor to the fifth floor making no stops along the way has zero attoz mz+5 rv9 6/n 9gwiylw:)xz8i7ubo2nd 2fcceleration all the time.

  A rolling ball moves fruc4n.: (;f ,so tl chyshnzf,hj-g,x.om $x_1=1.8 \mathrm{~cm}$ to $x_2=-5.8 \mathrm{~cm}$ during the time from $t_1=1.7 \mathrm{~s}$ 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 $t_1=-2.1 \mathrm{~s}$ is at $x_1=3.1 \mathrm{~cm}$ and at $t_2=4.5 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a sa5or, 70x9itm 1gmhi quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.4 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainer in a strai8dld;yg:k2m t9o + sesght line, moving 107 m away in 12.5 s. It then turns abru+9tdoedl 82gkys;: smptly 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 from; qz ,*(kigfka5t1tgz03kj z b $11 \; m/s$ to $24 \; m/s$ in 5.3 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 frodz0 xxpogs4kgi1:9 ry.*w tr: m $21 \; m/s$ to rest in a distance of 62 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must r+:t/54**rk drktzop fcpvs a9each 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 cpgukg :q -9;zyan burst out of the blocks to essentially top speed about-p:kz;u qy9 gg $11.0 \; m/s$ in the first 14.0 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 unifoq6f13 c2i8 ox3)lm nfwf7nmhmrmly from a speed of $18 \; m/s$ to rest in 5.57 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid mazjbhr5 2(8 gky 0z*kuarks 92 m long on the highway. Assuming a deceleration of hk y(bk0 gu8arz2z*j5$7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$