Suppose that an object trasc+h3n cuih h-v::x* * kjx3ejvels from one point in space to another. Make a comparison between the displacement and the distance3hx v: jc-xh*i3*jsuen: c kh+ traveled.

  When is the average velocity of an object h7n5tu oq 7,ynequal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty in 8 qfs (0y pi uwl4un(;.rs5se9r urefui;4qlrs9 snw5p (s0y( .s". This is a description of

  An object moving in the +x axis experiences avzfviwtn 2ni1dm(v)q(x5j -ll l 1 t.)n acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) be 3)2,l gxtqtzugins to slow down as it approaches a traffic light. Mlt2 q3,)tuzx gake a statement concerning its acceleration.

  Suppose that a car trad+vwef/)wa hdv1;jf - veling to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning i/f;+d)j vehawfvw d-1 ts acceleration.

  Suppose that an object is moving with a constant velocity. Make a statemen1uzbm .hy7s0 qt concerning its accelerati b usy7.qz0m1hon.

  If the velocity of an object is zero, does it mean that the accelerati0 qj;8akoj0xwfh v4h 1on is zero? Support your answerxhfvh8k4a0 ow j;j10q with an example.

  Can an object's velocity change direction when its acceleration * oox9p9vh ka-2 (rbam, zljc1is constant? Support your answer with an km*zc(92 j 9x 1-v raaopolbh,example.

  Suppose that an object is moving with constant acceleration. ng3;jb m*k3ddMake a statement concerning its mot b3jmk3d*dn g;ion with respect to time.

  Can an object have increasing speed while its acceleration is decreasing? Su;lgk3+idlc(b pport your answer with an exampled gik;3+llbc( .

  Suppose a can, after an initial kick, moves u(q ui xdn/t9kyu+ x- +(hwvng2p along a smooth hill of ice. Make a st+9ykg tq u(d+w v2xu/nih- nx(atement concerning its acceleration.

  Under what condition is average vel,kxmgl 4-ij9;xzy i.oocity equal to the average of the object's initial and- gj xl.ik;x 94yiom,z final velocity?

  Objects A and B both start at rest. They both acc: h /z:gysy)*fwi x+fp/bwg9u elerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed o b:yfy// *w 9+wfgspz)hg:xiuf object A compared to that of object B?

  Objects A and B both start from rest. They both accelerah5hmsu(e tpk,z7)hps ru +gv10x2x l-te at the same rate. However, object A accelerates for twice the time as objec h10p7g5 kx-s)hut 2pelhm( sx,+rvuz t B. What is the distance traveled by object A compared to that of object B?

  When an object is rel 1z7;3nf ju opxga )-:)xduhz5pp o5npeased from rest and falls in the absence of friction, which of the following is truezu op57 xx)o uz3a1n 5fdpn)pg:pj;h- concerning its motion?

  When an object is released from rest and falls in the absence of frictcol+j-c ey5j6 +hchds .qr4yp.fcj-1 ion, which of the folj 5fqj 4o cc. hr.6dspe+c1ch- jyly+-lowing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a stateoi)cc7pe/ r6 + q, fd0u8g+mht ;tkscoment about the velocity and the acceleration when the f,c+ )8 stuchort7g /0q+ck6dopm; i eball reaches the highest point.

  Suppose a ball is thrown strga5v*k 9lbx ,laight up. What is its acceleration just before it reaches lgbl95k,va* xits highest point?

  Suppose a ball is thrown straight up, reaches a maximum height, q tl40e/dj+hv then falls to its initial height. Make a statement 0 4de+v/ htjlqabout the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls tjzhr39g h:a5 to its initial height. Make a sta3 hga5h:zr9tjtement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thr./5,r( a2ego z bojsegj7 w7qrown downward in the absence of air resistance. Make a statement concerning its acceleo/s (e75rej7 .2jgqg ,robwza ration.

  Suppose a skydiver jumps from a high-flying plane. W3 q6(3ri,vs 9 ymiet/fpl6vdk hat is her acceleration when she she reaches terminal velocity33lqf, /d9k s(m rpitvye66vi ?

  A ball is thrown vertically upward with a speed v. An id/g8;wbn(rgc ;j1 fapf entical second ball is thrown upward with a n;b(f; gar8/ jgfwcp1speed 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 go than the first ball?)

  Ball A is dropped from the top of a bufb nt 30ciph3 g1)huo(lo(b.bilding. One second later, ball B is dropped from the same building. As time po(bf o3ib c.h3tu 1pb()h0nlgrogresses, the distance between them

  Ball A is dropped from the top of a 1gskcu4e *2albuilding. One second later, ball B is dropped ac14ku2gl*esfrom the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall be6+ wn *2chfqguilding. One is thrown up, and the other is thrgq*6wfn+ ceh 2own 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 building. A second brick is t gkjhc4t xg -kthy.-.)hrown straight down from the same building. They are released at the same time. Neglect air resistanceygtk 4.h)xjk-- tc. gh. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The pf5zla s 1 /92kn8*tazeme 0iolosition versus time*fe mlz n/ea58 l2zo1k0 stia9 graph of this object is

  An object is moving with constant n+iht 8)r9cnjoon-zero acceleration in the +x axis. The position versus time g9h8j i+cort )nraph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The ve3yw8misk4jpol-9 v u1locity versum1vuk4slj w9-3 ioy p8s time graph of this object is

  An object is moving with constant1 6v*( fuugd (2pehkai non-zero acceleration in the +x axis. The velocity versus timevheaf 6kg1( (*iduu 2p graph of this object is

  The slope of a positrx6nr:y5gz;(cosw q/ ion versus time graph gives

  The slope of a velocity versusk1k:h 2 c n29*l odk r-demwzdh-uvc.0 time graph gives

  The area under a curve in an acceleration v ap,gnjz;tb xn)0fow- 0a: s1cersus time graph gives

  The area under a curve in a velocit9p ;/8je pme3wlycdw 57nl4dvy versus time graph gives

  If the position versus time graph of an object is a horizontal line, t4i57um7fm u8c6u x qibhe object u7cbx87f4mi5qiu 6u m is

  If the position versus ti) 1z ivo0tlx)bme graph of an object is a vertical line, the object is0lo) 1bt xv)zi

  If the velocity versus time graph of an object is a horilo:+z f* 2heis4-zz zlp 2:oblcnb1q9zontal line, the object so9lbz*z: fz:zl p21oqebnl ch+ i-24is

  If the velocity versus tim: (g6b/- aorx-4)9kp eyk.agjtq bxsje graph of an object is a straight line making an angle of 30 degrees with the -babrgk)9 s.aex/ pxgj6:koq- ( y 4jttime axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find +qo:eke fs0: eboth the distance traveled and the make:o+fe :0sq egnitude of the displacement vector.

  A boat can move at 30 1 (vvidqi.(zg dj n nd/k0m76bkm/h in still water. How long will it take to move 12 km upstream in a river flowi zvd .gnm d70(1jn/d ki(6qbving 6.0 km/h?

  55 mi/h is how many m/s? (1 mi =urr 8,ns 6 ca/phig(*c2 z:lvi 1609 m)

  What must be your average spxnb rfv uz5k16o:r qz i+tewc497k3q0eed in order to travel 350 km in 5.15 h?

  A runner ran the mar9r + c;+rin20zakcn8,cif0pw3 ihwbf athon (approximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runne80b0nrc3fi pz29r;k hwcwfic ai , n++r in m/s?

  A car travels 90 km/h. How long8za j*.fku 5gb does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one y ur-j - 7ivdk./yi)ji,u)vo stear. The speed of light iy/.ijt s,oku- jui7v vr-d))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 and you look to the side for 46g qof,n wg+x6l9x poh7atgr7o 4*f /a.0 s, how far do you travel during t*+f67wgfoxa goxpn6 t,7h4l o/gar 9qhis inattentive period?

  If you run a completi)x1mm h6ci)fhs)2( dulu +ge e loop around an outdoor track (400 m), in 100 s, your average velociteh)2cgl1xi 6i )mus(f)u+dh my is

  A polar bear starts at the North Pole. It travels 1.0 km south, then zaan) u40s .mf1.0 km easasuz a)0 m.f4nt, 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 speed?

  A polar bear starts at the North ,m3wf dxgm gw29je1jr ;5i3arPole. It travels 1.0 km south, then 1.0 km east,wwf9a,g m;j r5 jgxer1m323id 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 velocity?

  You are driving home onfl60yg yg,wnk fuz797 oho ;j- a weekend from school at 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 f9gw 7hy; j -0ulz,fykf7 g6noorom school?

  A motorist travels 160 km at 80 km/h an2l.ojg;m/t dz5gc q.e.nhsn 1n/6fsy d 160 km at 100 km/h. What is the average speed of the motorist f m/2;oqnh ze .f5 j. gslyn1.cg6t/dnsor this trip?

  A motorist travels for 3.0 h at 80 km/h and )nj*eb89(i v uv ;ngzf z,hw7y2.0 h at 100 km/h. What is her average8v unjf be9);vn z, ygh(*7wiz speed for the trip?

  An airplane travels at 300 mi/h south for av0/iw 2.*nml )gbbc. uaxc-emv 8ihyy;),wr2.00 h and then at 250 mi/h north for 750 miles.)0w bxu ,gie.am)rnyi a/-2.bw 8vvc ;m *hycl What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the37n jg*2rumt(y h2cf s last 100 m) for team A can r*huy 2(n3cfjgrt 27smun 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 s. The car's /5vxr;b8 f0xy0c+ hqa il sfi:average velocity during deceleration was 64 km/h. What was the cifl;+csi0 hrq 0va85fb/xy :xar's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the averagi6aj a;p jh7xn1q+wyv1:qh- 2o/,oleok mn l5 e rate of klv -j+n;w761,ao ealq:2o xhn 5j miho/pq1y$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerath qw:1l3nnu t1i*pu s3 00jmlees 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 and 9 mr3-ggvlf*pp zzh.0accelerates 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 acceleratoo94 -i3ckzn z) cixamd0q6s-ion of ikzqzxc6si3m0o4a9)-co n d- $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 4.9 m/s experiences a consm g wx4.y;qu(tj: 5uaotant acceleration of u5q4m atxgjuy . ow;(:$4.7 \; m/s^2$. What is the cart's displacement during the first 4.7 s of its motion?

  A bullet moving horizontall pgf4vl5smh ,7y to the right (+x direction) with a speed of 517 m/s strikesg 5 h7f4vl,pms a sandbag and penetrates a distance of 30.66 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult 20nri 1ca/co8yw 1rqw on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, an 0w1ni awcco/1r2ryq8 d 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 accelerati qs a6,xsrz9h:on 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 d1td r/d* ;zzxd w l qxq884 a0uk/l8mll3fk-xzistance of 200 m. What is its average accelerall/l0q-z ;/ d*8xa1kwrudd3x4kzl8 q8tm xzftion?

  An object starts from rest and undergoes uniform accs6v 0icvrma 13eleration. During the first second it travels 8.6 m. How far will it trav6acrm0vis v1 3el during the third second?

  An object is moving in a straight line wr ilu( 7.ivid 8n7h21hqt, fbo;0gwbmith constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 1mb,( i;ht.u wq nd7vg718hl r0if2iob0 m/s. How far does it move during this time?

  A car starts from rest and accelerates unijq6 v67 )omtktformly 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 az12jbjz.,gf 3y r2bcl2hv -yb g3v s:ibout $5.0 \; m/s^2$ 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 /pt0(p*hniq-pda gu 5 green, a car that has been waiting at the intersection starts ahead with a constaig/h t -0p5 a*n(dpqpunt 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 plane :,-qxnr io,/+ack ll+m7yes 69 xqdawt X where the acceleration due d/9+7k ll- cxxs+:m arqo6ienay,,wq 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 planen02km: cn+r; vqc0 5zw7dp0sdba zu2z t X where the accelerac7z a: mwnbs; + n02 v52qkpzc0z0rdudtion 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 planp( kf :*qcc:-w +:wiopgifk4ket X where the acceleration duc ip+:qk(p* -koi: 4cwwfk:gfe 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 the suy03zy xn3sm 3wrface of planet X where the acceleration z wx3sm3y ny30due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually gy8j0 tk j*adp)reater than 0.10 s. If your friend holds a ruler between your fingers and releases it without war *)pyja0dj t8kning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upwa/1o8zft2 b7y4s c ,zo;ipgx srrd at a velocity of 19.6 m/s. What is its velocity after 3.71 8xc oo b/tyg2szr4f ispz,;00 s?

  A bullet shot straight up returns gyunu*dflrq .*t6u z-8z4 t5eto its starting point in 17 s. What is the initial speed of q-et r*t z56ydln84u u fz*.ugthe bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long dok:rch (r)r7k ahwjla mrv8o-/u)u )e3es it take to return to its starting prmc(j k7kh)-u)r)ouhl ara :3v/w8reoint?

  A ball is thrown downward from the top of a bzos, , 9y/mdf6e lhhl8uilding with an initial speed of 12 m/s. It strikes the ground after 1.3 s. How high is ths 9l ,eyhzfd, lm/8ho6e building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numerical c+4b.vpj-ap l3o b+ revalue in th-blj+ ob+c.4vepra3 pe 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 a speed of 46.)3 pgax: bp)dt2 lpu5f0 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 12 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 12.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 17 ogn.g,c; lduhmc,t+.0 s?

  In Fig. below, what is the velocity u 1i42u t/lsd(3gvbky/rtcj: at t = 2.5 s?

  In Fig. below, what is the veg. ,iav + cq88k.equr:5hcfowlocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5.5 s? dflsq09aa g11sljzyvfx.t 9 4(jwn h)/ *:fcd

  In Fig. below, what is the average v j2 or/01hys,bzl ew/p:th lr*r 2ugf.elocity from 0 to 4.0 s?

  In Fig. below, what is f*-b v(r n.) pvu*5ook3e qbss-zj kzq;e2q6ethe average velocity from 0 to 6.0 s?

  In Fig. below, what is th1e +c)yoyu/k ahhh;ba 3t+hnt 0 tm++se acceleration at 1.0 s?

  In Fig. below, what is thtsdh8 7munp..py 1v1he acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0jkwko;o( 8p1mj . s wd)m4dz*k to 5.0 s?

  In Fig. below, what is the average acceleration fro v7a0drln w3j0m 0 to 8.0 s?

  In Fig. below, what is the displacement from ef + 1dimwl0s hga)grh4, w*c,0 to 8.0 s?

Does a car speedometer measure speed, velocitye,*ql6eo;xi186 x ,/oo gr xvwwjta.m ? {speed|velocity}

  An object can have a varying speed if its velocit ryuy xd88ob4/ qnmnpq,633l vy is constant.

  The velocity of an object can be nh3q-r e( -(dqtq*xypxegative when its acceleration is positive.

  If one object has a greater speed than a second object, the lt mdbtv,s,x7 9f-d *ifirst must have a gres ilxd*b7tmv ,d,t-f9 ater acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling4fb.bg igq ws93kp( s5 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 a-4vxmq6*gy w ss its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It k5cwu)c 35uth i)pw/j4iv3 j w4j,gb fleaves the bat with a spee4h uk3jj)w v, it)cww3jci55gf pbu/4d 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, whzg frz6 p as1.)iozd.7(oh+ueat is happening to its acceleration, how doe ih)dp zf1osozgu.ae+( r.z67 s it change if air friction is ignored?

  As a freely falling object speeds up, whqzy21ah / hs//; mz,tyfyro7uat is happening to its acceleration, how does it change if air frict;qm 1a fry/ztyz ho/u,2sh/7yion CAN NOT be ignored?

  An object that is thrown vertically upward will return to its orizc*xat:a +9)m a ooz9wginal position ooax)z9 +*wz 9c:taamwith the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero accelz.sqwgr),l mv +h*g (eeration at the same time.

  An object can have nonzero velocity and 59 pu;nun; wtbzero acceleration at the same time.

  An elevator moving from the second flo7liw2hn e;w6f *) dee4ll xyi3or to the fifth floor making no stops along the way has zero acceleration all the yil e2ww4 xeil)7d6 h*3ne; lftime.

  A rolling ball moves z 7z;+(2mby6hig*z oxsq 4niwfrom $x_1=3.3 \mathrm{~cm}$ to $x_2=-5.8 \mathrm{~cm}$ during the time from $t_1=2.2 \mathrm{~s}$ to $t_2=5.8 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.4 \mathrm{~s}$ is at $x_1=3.0 \mathrm{~cm}$ and at $t_2=3.2 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete lza oi +b/q+v.uaps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.3 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 lil4c.d xm y0oje m6ti73ne, moving 112 m away in 9.3 s. It then turns abruptly and gallops halfway back in 4.56y 0 3imo xced7.4tljm 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 fro y5t6x1o lcht9m $10 \; m/s$ to $24 \; m/s$ in 4.3 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 frox;.-j*y8.n mt:y; evh2c:ya cqhcl)jog;yow m $19 \; m/s$ to rest in a distance of 62 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speedfp87 sv:a(l3hp csy.i of $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.9 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocksyt0mxu2j) 3vlw3j vj4 to essentially top speed abou vu0jv4t2 mlj3)x 3jywt $10.5 \; m/s$ in the first 12.9 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 speedb0b gtg* fm l24q5qpg -d9f2ce of $21 \; m/s$ to rest in 5.63 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.39j,k uyctr uak: ea/l-5znx5 Assuming a decke5 z9uynk tlu,jxa/ 3ra :5-celeration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going *5mfbvcqe, mzl55vb 5l;1 19 bejk:ohkfnet/$25 \; m/s$ 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 exacb. cidw5zih2 6tly 27.0 min, there are still 1100 m to go. The runnb iiw5.2czd6her must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$