Suppose that an object travels from *b/x *wld,6t(uc7 p *zxdc)kn 5b zzhfone point in space to another. Make a comparison be*u *7(zcdft h*bl)zpc 6n,xbdzkwx5/tween the displacement and the distance traveled.

  When is the average velocity of an object equal)ex nbf)t4.n c9 ksrl3 to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero toomn5 /sdht* f+ sixty in 8 s". This is a descrinf +m/*th5 sdoption of

  An object moving in the +xwoprc+;(af c;7 - kb(jjofo+z 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) b,adzk n8eh2,5jf i:wr egins to slow down as it approaches a traffic light. Make a statement concerning its acceleration,iz:j5dh, rkwa28f en.

  Suppose that a car traveling to the West (-x direction) begins to slo3 q4sn ,cz4 j:r- zjd0g9wqyqrw down as it approaches0jw d-jy: rqc9,n 3rgsz44q zq a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constanm0m g6;7pft sy/qex7v t velocity. Make a statement concerning its acceles eypfx q6m;gv/m 7t07ration.

  If the velocity of an object is zero,y7ja swo0er+, does it mean that the acceleration is zero? Support your answersay0r j,+7e ow with an example.

  Can an object's velocity change direction when its acceleration is cons ;3cezudw r ihzg*qz 567ook3,tant? Support your answer with an 3o e*gqc o5 r3u6;dkizw7zz,h example.

  Suppose that an object is moving with constant accelerazy *.3xhp0vo9fw wwr-tion. Make a statement conc.w pzr xwo hf093w*-yverning its motion with respect to time.

  Can an object have increasing speed while its acceleration is decreasing? Sups4vl.uvt f mh3 :u8v7aport your answer ulv7 v.a4:s3vu8hftm with an example.

  Suppose a can, after an initial kick, moves up along a smoothdk 9fx a;p;p h62fs:2myimo a5 hill of ice. Make a statement concerning pd25 ak: ox;m 2;fmhf a6psy9iits acceleration.

  Under what condition is average velocity equal to the average of the obj2) u)hs1y+jit c0nhcc ect's initial and finui tj c20h c)hn+cs)1yal velocity?

  Objects A and B both start at restmj)a/n q*jjp*. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A coq/npja)** mjj mpared to that of object B?

  Objects A and B both start from rest. Th(mj8 szy )zs/xl l(t8 (jxdr9gey both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object9lzx )gl(8z( rx jm yt(dsjs8/ A compared to that of object B?

  When an object is released a0snuq5jo cm8rdv .:1tkw;0 vfrom rest and falls in the absence of friction, which of the following is true concerniowr1tmjcvad u.v; 5n8q:k 0s 0ng its motion?

  When an object is released from rest and falls in the absebs .nj0ub/ig:nce of friction, which of the followi:i.bn jug0/ sbng is true concerning its motion?

  Suppose a ball is thrown straight up. Make a stat6,le,;wysv - f, :psjub7ctsjement about the velocity and the acceleration when the ball reaches the highest powvssfc,lsjy e :bt;,7p6j,-uint.

  Suppose a ball is thrown straight up. What is its acceleration just before iti9:ycyz1gni p/ bc 1+p reaches its hc:i+9p1b1/ nygy cz piighest point?

  Suppose a ball is thrown straight up, reaches a maximum hj/y55kt he1iidz, r2ieight, then falls to its ytje ki id525,hzr/1iinitial height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, re03f jlviw. beqw:0by)o c:od 7aches a maximum height, then falls to its initial height. Make a statement b0b)7qi : fo.w3cled:ojy0vwabout the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is throwwbvoq trr: x:7h w4 (f6eml35kn downward in the absence of air resistance. Make a statement conceormx5lt:qf vbkw 3e4:67 h wr(rning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acaqm7 6x4gu340gajvc yceleration when she she reaches terminal velq03 umgxa64cv g47 yjaocity?

  A ball is thrown vertically upward with a speed v. An identical second ball mfxpqfji9 /5 0b/,kh pis thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum hei/h 09 pfjm5,xibqfkp/ ght 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 m;t9r5xh hon. v-d29q(w cvum /ma(x dbuilding. One second later, ball B is dropped from the same building. As time progresses, the disd nxudxo.r mvh(2;/a95 mmh( wqcv9-ttance between them

  Ball A is dropped from the top of a building. One second later, ball B:t4y+ ah qv0c ztaa0fxv;o.khrpm5 *2 is dropped from the same building. As time progresses, the dirh*pa+c;z.0v f5ya:2vx04mq oatt khfference in their speeds

  Two objects are thrown from the top of a mpb+/.zrz l,jsny g. d+y6.yjtall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speel/yp.jgz .d+ b,jys+r.m6 ny zds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thrthc2vf-i*rb snq /xc54ix5e :own straight down from the same building. They are released at the same time. Neglect aiscic * 5e x4 :rq5nxt-f/biv2hr resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axisnr3 7 -5qtgge 2hpoi-gkg(/dd. The position versus time graph of this object isor-(ng ggd-5qtdhie2 g73kp/

  An object is moving with :t qx1h/9yml(fumq 0jconstant non-zero acceleration in the +x axis. The position versus time graph of t(10mfmh:jqulx qt9/y his object is

  An object is moving with constant non-zero velocity in the +x axis. The ve-8eir. zm ymz0dk(lqruti4e1/u)n, q locity versus time graph of this obzqrulky/ mz8r4 -,ti ( iqe)0due. nm1ject is

  An object is moving with constant non-zero acceleration in the +x axis. Thehzg4tyaz bx jnoem)(j3vcxp+)4* s:( velsz+ * zn y4h4m:3(v)px(jbtjxogac )eocity versus time graph of this object is

  The slope of a position vewkibpgo .5 d4*rsus time graph gives

  The slope of a velocity versus time graph gchkg+s1 rb k4)dnqg8)h -6f 2ncat) uyives

  The area under a curve in an accelerati0y:gpix5 wdwl 1e5-fsk cef:4on versus time graph gives

  The area under a curve in a velocitz0 m4esslmws*1 iu p2,y versus time graph gives

  If the position versus time graph of an object i q;o/lp.b+ej9 bd*q1)p1 tnufiote :b s a horizontal line, the object isuq: pt b dop ;9e)lfn*b1bt/oqeji1.+

  If the position versus time graph of an object is a vertical line, the objectq31; tl(lb ;uywyb2 yg is;b 2 ly1y;3tguwly bq(

  If the velocity versus time graph of an e;h l1 lj6qr)ab5h*s0 ehidr ;object is a horizontal line, the object is;s1ijd5 6bhh0*ehlae rl rq);

  If the velocity versus time graph of an object is a straight line making anoytj8x ldp3nge()(u(edi p do)5 -)sk angle of 30 degrees with the time axis, th( noiy8u( se3dg()ok)tx5 lpj-pdd e)e object is

  An object moves 15.0 m north and then 11.0 m south. Find both8x,p j zxomp9+on:3 m+n1 pynhqo8 9fy the distance traveled and the magnitude of the displace1h39yxp + ppz,q9mn xono8m8fnoy: +j ment vector.

  A boat can move at 30 km/h in still water. How long whm( nv*h9 i7xw3dkn ;cill it take to move 12 km upstream in a river fnhwh;v 9mkxd(ic3 7 *nlowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 m)tnuf t(.rbu5h.2rb c7sa9t.t

  What must be your average speed in or,ur5t,zj k c3onle9-ydwq (( qder to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 kmg4p4fn1u9e hx ) in 2 hours and 57 min. What is the average speed of the runner huxf1e4np4g 9 in m/s?

  A car travels 90 km/3t (3,5r.owk/hie vtgc yt ,a7tr.nczh. How long does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one :eb5;m xemax8 year. The speed of light is:8xexe a;mmb 5 $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/h *qj)q (oou/6lsu qdua28 bftl2rca k/2ci-v 1along a straight road and you look to the side for 4.0 s,biu282q2 (ul r) -/d cf vaajkoltq61qc/*os u how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor tra56z r*lxnh3dpck (400 m), in 100 s, your average velocity is5xdn* ph63rzl

  A polar bear starts at the North Poleb(x)8coju .. qjobp 6t. 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 wasjpco) bbt.(6. o8q xuj the bear's average speed?

  A polar bear starts at the Northbm glyg(j9 7 nj84b0jh Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km b ml(79bn4g8jj y0ghjwest to return to its starting point. 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 110 mileemwrgg28, o 7(1p wq2of)lneqs. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and g8lpoeq 7 wg1wrq,f 2)mon(e2 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.dvn;z7) 7 dz7exskec. What is the average speed7e vzsc;e)dxn. 77 kdz of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. W(nh* o5, 7gc +6rzdx ggzdnno2hat is her average speed foz, h +gn g6z(r 5c2od*gdxn7nor the trip?

  An airplane travels at 300 mi/h south for 2.00 h and thegex .h:rfwkx/ 8 oz-/en at 250 mi/h north for 750 miles. What is the average speed fe.o-xw:re gf/8/z xh kor the trip?

  In a 400-m relay race the anchorman xjc bb(; 4p2n-yhf6mc (the person 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 o;b2mxbpcy f4n -hcj (6f the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop aftc9pt6nxy md-3qn0*r:r 7 ormjer 8 s. The car's average velocity during deceleration nmq3ymcdrr67t0 o-*jxn pr9 : was 49 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average rate q.6t vfbobc:*of :t.b*6voqbcf $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at thoc;v, xc2ooapj can8b r .-nk6a+/+fj e 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 accelefd f9/g;eim; hrates 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 upod8h (uqi1e5+fovfi2f* t6 fp with a constant acceleration (ho qifffd8*v 1f6p2o+uti e 5of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 7.4 m/s experiences a constant accelera)x 02, vmz2 zcpfayfd5tion om0fzv 2cpx 5f2 ydaz),f $3.6 \; m/s^2$. What is the cart's displacement during the first 5.6 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a sc9p0 0 vhvnx;+4tv wzv/owu k8peed of 470 m/s strikes a9 wcx 00nvup/zwovv4v8k+t; h sandbag and penetrates a distance of 36.53 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane i88x npk3bdfp( o+gy k(6 fdch5c/ut n-s launched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this req/ nut(cn8 xp5ff 3h-ko( gk6c +yp8dbduires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant acceleration om/vx*d1ve80b ks:h mpf $2.0 \; m/s^2$ 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 mi,y0payl(7p- 6mw wr a/s in a distance of 200 m. What is its average acceleratiaar7w6pl( ,i y0m-wyp on?

  An object starts from rest and undergoes:jdfk/0 ry1yzo hm8g .7xj2 oz uniform acceleration. During the first second it travels 2.8 m. How far will it travel during the third g kxyyj8fd1o2.r0o h/m : jz7zsecond?

  An object is moving in a str)l: r+6y pkxnnaight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds l+p6rn )lny:kxater it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformly)72zx6s,wk 5yap kgab 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 w v(7uow 4a+;ic7fdv8c qvhzqy8l:m mg r1.+m$5.0 \; m/s^2$ 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 o f,c6hlkw9-)g pmi3f the interse3m ff6- ) c9wokp,ihglction 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 upwaw2ns/l4qlao)5 , ,qku /eozk ord with a speed of 12 m/s on the surface of planet X where the acceleration due to gowo/lqk4kuqn s,52a,ez/ l) oravity 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/zfk( orchflmrl-5+rls2,gs/ v+j t k+6shy 5/s on the surface of planet X where the acceleration due to gravitt(rczj f/k5m6+,olrk+vfr5 h -yg 2 +sll h/ssy 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-ufvc./mxia -xa 2l6 fq)fv c cayl5)+ a speed of 15 m/s on the surface of planet X wher)6vux-i qa+cc/fva y)l2 m af.fc5 l-xe 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 upwe4/j-8 exjwcd99/b pdtit;4d plxf o+ ard with a speed of 14 m/s on the surface of planet X where the acceleration due to gravixj /4 poexef9b94 t+pwdtji-c/ ldd;8ty 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 f(gyr(w e wvemz4k0n7 6riend holds a ruler between your fingers and releases it without warning, howw(nez4 0( vywg7 6rmke far can you expect the ruler to fall before you catch it?

  A ball is thrown upwar.9knhoo4l 5 b4u1v xcf; repy7d at a velocity of 19.6 m/s. What is its velocity after 3.00 s?o9b45 ly h7k 4;oc xrfv1pu.ne

  A bullet shot straight up returns to its db9a a*ks g3yu/eb6- nstarting point in 9 s. What is the initial sp3*adkbyg e /6usb-an9 eed of the bullet?

  A ball is thrown straight up with a speed of90tigb a**3qeg1a5argv we m + 36.0 m/s. How long does it take to return t0gi r+g ev9*eatmbaqg1w 53a*o its starting point?

  A ball is thrown downward from the top of a build3x+o ,nv1 tqm87vmoffing with an initial speed of 22 m/s. It strikes the ground after 1.9 s. How high f,fvtm38 mx1v +o7qno is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fil ;e v5m1(3qdtbwceq9 ql in numerical value in the b ce(qe1v 39m5wqb q;dtlanks)
(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 a-:4orx f j;vj5k5,r eohw dlh0ir with a speed of 31.3 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 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 is the velocite2 axc-a7d m3ny at t = 1.0 s?

  In Fig. below, what is the velocity.hy,k1e pq2o q v/2/;mawfkov at t = 2.5 s?

  In Fig. below, what is th1pe4o ze;clg 2e velocity at t = 4.0 s?

  In Fig. below, what is the ve w( -ltsul.*ealocity at t = 5.5 s?

  In Fig. below, what is the average velocity from w.gv2h5q gdum0 gqp3. 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.0 s?wku dmz/ fn zip.y2*i3,27gdq

  In Fig. below, what is the acceleration at 1x : )6 7q*r xptpksv-/zp+2gxz sn4aiy.0 s?

  In Fig. below, what is the accelemqlammu,.c )ia.) p( cration at 3.0 s?

  In Fig. below, what is the average acceleration fmm4l5vhe i k;m4w9y3 hrom 0 to 5.0 s?

  In Fig. below, what is the average accehui 4k dl1;mgk 7)hlv kd6d9q*leration from 0 to 8.0 s?

  In Fig. below, what is the displacement fro *yd.ew2dc350m ageca.q z9q)-axiui m 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velocijp.+cgi (x-sxty}

  An object can have a varying speed if its velocity is constb wb 8d/1-h,bcoc k2vbo6 j*brl+mh4f6 jjv6qant.

  The velocity of an object can be negative w/wiwou2u o.hv,:y q+t wib37 shen its acceleration is positive.

  If one object has a greater sp nqtz t w*3snf((;dnd3eed than a second object, the first must have a greater acceleratiwf3ntsdd n((qz 3;*tnon.

  Two cars emerge side by side from )jm z s uff13bn./9brva 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 speed adt hd674d nls8oee.f4 s its acceleration decreases.

  A baseball player hits a foul ball straight up into the8/b dsw 9u0+ht,a6li5rcj nw w air. It leaves the bat with a jt ba+w0dw6u i 5hrsl8nwc,9/ 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 kyqvl*c41;hjo 9rnbr wr f19ehl72c5happening to its acceleration, how does it change if air friction is ignoqe 7;kfr1ll9rjy4rv *hb 9c2h 5c1nowred?

  As a freely falling object speeds up, what is h*ynksc0i. u v/ x9jsuo56r i+uappening to its acceleration, how does it change if as ru vs 6.0nxu5/ici9juy*+koir friction CAN NOT be ignored?

  An object that is thrown vertically upward wir 3quc7 l;kztqu3 7mu7ll return to its original position with the same speed as it had initially if air resisztukq37crm7q uu73;l tance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velociha kno.e)t.: obk/c j.ty and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the same timg1 jfw:k;git6 hi) b ;eob/p6je.

  An elevator moving from ik hod7c95fk9the second floor to the fifth floor making no stops along the way has zero acceleration 5997c od kikfhall the time.

  A rolling ball moves fs;zl2yk . df8wrom $x_1=2.1 \mathrm{~cm}$ to $x_2=-4.5 \mathrm{~cm}$ during the time from $t_1=2.9 \mathrm{~s}$ to $t_2=5.2 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-5.0 \mathrm{~s}$ is at $x_1=3.1 \mathrm{~cm}$ and at $t_2=4.3 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around-zimdxs968xws,h ol0. ka+ys a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.3 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 line, moving 91 m away in 9.1i36) tc wj j1xcgoz.iz6j 0ug1 s. It then turns abruptly anjju ggci66 o)i0t3 wz 1.cjxz1d 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 fr (nv:n,tbvhvyycrux5h0 , y-)om $10 \; m/s$ to $22 \; m/s$ in 5.5 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 frozb4+srq+lp 9x0 zwi2t psfh/ 1m $22 \; m/s$ to rest in a distance of 66 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed (x5/zq moi*ygsg0g o 1xnvd;4of $32 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter)mr/ml:yjbqu*h pe1u :n4t( s can burst out of the blocks to essentially top speed about :uy*(/pqbu: t re4 1nmjml)sh$10.2 \; m/s$ 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 uniformltmairz isfuu 217- e37y from a speed of $16 \; m/s$ to rest in 4.97 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. Assumin 1m23abyjswl.g a yb3m.21j a slwdeceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tr.kd4+),yul. fcy ylmquck 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 e .d)f8d,4ry; qgzr rnsxactly 27.0 min, there are still 1100 m to go. The runner must then accele,ryr.g4z8 drsqd;n )f rate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$