Suppose that an object travels from one point in space to another. b-vr9+r j j-yc:k/zg7-tciy r Make a compar-rr-z/jktigr7+ v:-9j y ybccison between the displacement and the distance traveled.

  When is the average v+2)xok imo+w:8 nxz3hsz jfw(elocity of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "f g.spc jghgjj *8p79f/rom zero to sixty in 8 s". Thisfjgs*c .j 97p8jpgh/g is a description of

  An object moving in the +x axis ee wweccpacyb ) -,s9-*xperiences 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 f3if6d 4x-ry,qu h )ijdown as it appffyd)i6iq 4rjh-,ux 3roaches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x directwp3()7qu; +jfylfdzw 4kx eb, ion) begins to slow down as it approaches a trak(puyf)7zfdw b lxjw4;q+ e3 ,ffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a st*fav +4uqw:8gvs, roz4a r kpc z )i8gl+w;bs9atement concerning its acceleratiobg8vqfcw r4:k;ogl+ s8*az9ap zr,i+ wu)4vsn.

  If the velocity of an object is zerox 11 5;rtoyufc, does it mean that the acceleration is zero? Support your5f1 x oyuc;1tr answer with an example.

  Can an object's velocity change direhv,f/n e,6e;44e qk)nm uoabpction when its acceleration is constant? Support)nk q4mevhfb,4n a;/ u, o6epe your answer with an example.

  Suppose that an object is moving with constant accele, us/8 k8 aninke nico(tn6,mgb2el.)ration. Make a statement concerni2i s,tankkgicn( nuom868,e) bel. n/ng its motion with respect to time.

  Can an object have increasing speed wsf5n c e2*onw1nam- e4hile its acceleration is decreasing? Support your answer with an exa2se5nnnm4a*-ow fe1c mple.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. Malp4*w di 5ydlcdy+iid c- j.82ke a statement conce dcj5y4 2 .yp 8ddwli*+ilci-drning its acceleration.

  Under what condition is average velocity equal to 8f/vf 0w/hmccupn 1by4 t,b1y2ahb0a the average of the object's initial and finalb2uc01y fn1yh pv t,0bfmc4wa /a/bh 8 velocity?

  Objects A and B both start at rest. They both accelerate at the same d8m/ccba cruo(w5 .*j rate. However, object A accelr /dobcwuc8(5. j*cam erates for twice the time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both starm)bfto ( i98g8om 3mnvt from rest. They both accelerate at the same rate. However, object A accelerates for twic 8n)9om m38mvfgot(bie 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 absen8rv60xv1)bckt;; elng/ djuhce of friction, which of the following is true concerninjl bd0e1 8;vh/ txvngr6;ukc )g its motion?

  When an object is releasjg3h,e.(29ve oe2rpj w v 6yed;m*nq ued from rest and falls in the absence of friction, which of the following is true concer,j;eojwe.y*2 pdm q9ehv v6( rg32eunning its motion?

  Suppose a ball is thrown straight up. Make a statement about t7y0wp0rh q)l/za moj7 he velocity and the acce0z77hmoqjw) rl /0ya pleration when the ball reaches the highest point.

  Suppose a ball is throw3ny nijr,,(m r.4gir,8 ebmdnn straight up. What is its acceleration just before it reac ,8m dgj.br,imr(n4inyr,en 3hes its highest point?

  Suppose a ball is thrown straight up, reaches a maxk ,j),8tln168 7tnuei,wpsb- uovavoimum height, then falls to its initial height. Make a statement about the di,nu6 8v p -jtklbe,1t)vanw7uo osi 8,rection of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum d o;* -+mpd 9ez/xwk98bnuve:xqo*ok)(x iam height, then falls to its initial height. Make a statement about the direction of the velocity and acvxoz/9p +miko mqxa*u) :eexb*wn;d(dok8- 9celeration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Ma)xo gu*u-.m ntke a statement concero.u-gnu )x*tm ning its acceleration.

  Suppose a skydiver jumps from a high-fl7zf,a,a hl3 akying plane. What is her acceleration when she she reahf3a,az lk,a7ches terminal velocity?

  A ball is thrown vertically upward with a speed v. Anei6tgv c(v-l dcbsl1pl1 +;9twcu :m; 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 fitew; v l;1c -dc ic6:gs(p9vltl1u+mbrst ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a buil,0dn)wru jju: ding. One second later, ball B is dropped from the same building. As t)nr:d0wj, uuj ime progresses, the distance between them

  Ball A is dropped from the top of a building. One second z8g 7r;kuh :, uep ey):8xwmgflater, ball B is dropped from the same building. As time progresses, the difference ihex,:gg 8ufm ;yrw8 7pue:kz) n their speeds

  Two objects are thrown from the top of a tall building. On/*qw u mnefd5hz)+if 1e is thrown up, and the other is thrown down, both with thezw/ hd)un1fe+m*qf5i same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a b+l ma/cg a i-t-di8-dluilding. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the acce+t/dc -gi -mll8a-aid lerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The posity 9s6gho(645,l mssi3ns aob nion versus time graph of this objemb sl(346hy os g95oisnan,s 6ct is

  An object is moving with constant non-zero accekaiy-u zl0b 0jt( 6m*2zutae 6leration in the +x axis. The position versus time ta0 mk02euua-6 lt(zb i*6zy jgraph of this object is

  An object is moving with cttlv. o65-b;;ajcge*ga c) rbrb9oi ma 473zxonstant non-zero velocity in the +x axis. The velocity versus time grapcaagtr. -3at9j*obo )gmxz5ce;r4 6i b7; bvlh of this object is

  An object is moving with constant non-zero acceleration in the +x axis. d-.xye,r+lki The veloxi d.+l,ek- rycity versus time graph of this object is

  The slope of a position versusr xv*,v.7c6n 1h vmaqfft7i9ed kgz*) time graph gives

  The slope of a velocityb4cxqy lw40f6t i.p e. versus time graph gives

  The area under a curve in an acceleration versus time graph giv3e0pjn(a m 9htwc4oeh)( t,ca xwo 3-ues

  The area under a curve in a velocity versus time graph gc g*hqp0i.33 r- wwojnives

  If the position versus time graphn8bpa(b vsc*k(q8w:l of an object is a horizontal line, the object al8*wv(s:(kbq b cn8pis

  If the position versus time graph of an object is a vertica1rdbv(xqs .t*h h(*nbl line, the object is .x(r stq 1bbhdh*v*n(

  If the velocity versus time graph of an object is a horizontal line, : 3dzi orm(;p e:aezhz3 1fx2 upbop8-the object 8ohai(rd z pep:32:p1z 3oex ;-mfubzis

  If the velocity versus time graph of an objec/( *butrwf9 xtt is a straight line making an angle of 30 degreextt( ruw*9 /fbs with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distancia bj 7n 8)5w8k cafasc57h)rke travelec77 8ki)aafr bha)5cw8kn5sjd and the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to monwl4x 1q nu ke5clz8xg8f))x8 ve 12 km upstream in a river flowing 4e8c85) nnz x kx)glfwq1ux8l6.0 km/h?

  55 mi/h is how many m/u.c +)33d rgak z6(2buwlmrdss? (1 mi = 1609 m)

  What must be your average speed in order iqpsdw3taiqqpy0 37g/:zi) 8: od wn9to travel 350 km in 5.15 h?

  A runner ran the maratho.1pzb sfc ea6z js1 f6 wk0nxnu7,-,xnn (approximately 42.0 km) in 2 hours and 57 min. What is the ab 1pxznxsn-f0ec1n,wfz. ku6,7sja 6 verage speed of the runner in m/s?

  A car travels 90 km/h. How lon4ihppj5 df 7,ng does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels ijg gn6r9,f 2rhn one year. The speed of lightrj6g2fg r ,hn9 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 pk /sfzq54vx) to the side for 4.0 s, how far do psz4 xf vk5/)qyou travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your avwl a;wkjwiq.wux t++q qj -40*erage velocitwq4j- + ;l tauww0q.+qw* xjkiy is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 wae0 a,;(okgmkm 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 smg aeka;(,o0w peed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0hcsmho+ ,f5od4 /1r2 p gk0sa7mwg lx;9y,wy o 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 bem,m +9y 1dssofc4ay 0wgx2ghh /pw;7o,lok5 r ar's average velocity?

  You are driving home gxay5a.91t8v l4xlux on 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 froulla4 yxatv1x.85 xg9m school?

  A motorist travels 160 km at 80vlo l zo0p2wp::9e*r j km/h and 160 km at 100 km/h. What is the average speer o:9vel:wol0*zj2p pd of the motorist for this trip?

  A motorist travels for 3.0 h apu 36ogt.jb/mov; 5akt 80 km/h and 2.0 h at 100 km/h. What is her average speed36o jm/o;vgkaub .t5 p for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north form6t8oig /+ uihu3jh. x 750 miles. What is the average speed for the u/.o 8+gh36thi imujxtrip?

  In a 400-m relay race the anchorman (the person who runs the last 100 4ndt ;ay2s s()a ff7/(woyfgto:1k d tm) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m i;)a/ysf 74:t dsnt yof2w otkgaf1d((n 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 12 s. The car's avfesp; u7bbo v 6pqt3 l)7wl8h6erage velocity during deceleration was lhw;sp6le7ob 7ubvtqf) 36 8p 57 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from8gg u:oeg kkqm5.2 h1p 100 m/s to 160 m/s, at the average rate of o5e mq gkg.g:huk128p$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates a dyxs ti:5b/(it 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 anx7 emagj:mk7k2 1qz/fd 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 conl92jaa0r tv2/i,z 6- ygsxcykstant acceleratio,k2 yat9ixl0r/gas vj62yc-zn 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 4.9 m/s expefvh(xzi c+l *:r) u/zhuo5l,xriences a constant acceleration of (ul5xfl,zh o *c /hu)irvxz:+$2.8 \; m/s^2$. What is the cart's displacement during the first 8.4 s of its motion?

  A bullet moving horizontally to,ortdv36 xjzqpb3: n3 the right (+x direction) with a speed of 290 m/s strikes a sandbag and penetrates a distance of 60.17 cm. What is the average acceleration, x 3 rnv3jtq6,zdbp3 o:in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a cabb mnzhz,*;l- tapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what izm,b h*zn -b;ls the length of the catapult?

  A car starting from rest moves with constant acceleration of s)/op0v fsdz9$2.0 \; m/s^2$ 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/szs1k1kvtb 9wf y;ki/3 to 80 m/s in a distance of 200 m. What is its average acce/1iszb9kfwvk3;yk1 tleration?

  An object starts from resti-hdsqpu3 g9, s,: jrx and undergoes uniform acceleration. During the first second it trarp9,j3qh ,usxdg -si: vels 8.1 m. How far will it travel during the third second?

  An object is moving in a straight line with constant acceleration. Initiap0v/r m cv8 7bqk9tw0olly it is traveling at 16 m/s. Three seconds later it ipb/ wvm0k7 8q rcv0t9os traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates un5 .xwc9y, /xovp9tfsbl ( .agdiformly 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 decelera r0/f.7z ks7z0kc nxwqte 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 waiting1 bt9co43es yi:2sfba at the intersecto1bes 9 yifb:sa t432cion 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 speed of 12 m/s on the surface oum5 ua 4;+ kej cgdt7ebyrd;/(f planet X where the acceleration due to reukbudc+(g t7;4 /ajmey; d5 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 teqxgpcj 06 bjlv ,1+/v ikei62he surface of planet X where the acceleration due t61vvkbxq ,e0c+j/6pejig 2 i lo 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 w,igfrt5xe; 0 uhere the acceleration duefg; rexut50,i 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 z.5p(6n xu1pvr 3po7+clg :i fhvlv7cm/s on the surface of planet X where the accelerp 6hu g7+5cp1f ro( vli7pxvv.z3c:lnation 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 greater than 0.10 s. If your frhls-l7 ls*9sudnkp( 7s .nqq er(/-maiend holds a ruler between your mp7hq*l-els.r9(s qd/-s k(l n7suanfingers and 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 5xc7nqnf9 g6 aof 19.6 m/s. What is its velocity after 3.006 gnna 7fc95qx s?

  A bullet shot straight utybv1gkok,z x /rz)05 ( fx6wn7 z.jdap returns to its starting point in 16 s. What is the initial speed of tabz5z/)xd kx6gnk71 wfyo, (z .rjv0the bullet?

  A ball is thrown straight up with a speed of 36.0 guacb;xapr(b- y*hor -2kx09 m/s. How long does it take to return to its starting poi *hbp2y agrbku09--c; (x roxant?

  A ball is thrown downward from the top of a buildings29jqzgeup/4b-3 yfc with an initial speed of 25 m/s. It strikes the e9qj -gp3zu /f sc42ybground after 3.0 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numericws/kei , ybu+u1: oys6al value in the: e,siyos+/wu1uk y6b 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 45.6 m/skb1u bp f+w;c kf k/v66u92kzhc3r4bh. (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 14 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 14.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocit5 pfos tncbq.zj7v;;4y at t = 1.0 s?

  In Fig. below, what is the velocity at ri7w7(bwxaj pfqv/ w+ f fo ,ai.)+4 we-n(qevt = 2.5 s?

  In Fig. below, what is thwgls. o+;qbj5 (wu2ix8n1w b ze velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5.5 s x4 e3 lc9y/vvyf-1v yy7r1uyo?

  In Fig. below, what is the average velocity from 0 bqtz)evv 03 *-sxo8gqto 4.0 s?

  In Fig. below, what is the average velocity fromerv)vw(a9i, ve9 ndh), we;pj 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.9e/dcjrc z7ii )47rr b0 s?

  In Fig. below, what isu0cmeye) j. +6.ngt 8cf 6mfqj the acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0 s?)2h -j4xigo0c- lv iyc

  In Fig. below, what is the average acceleration f,e(n +ffxxa:grom 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8. qeor7s:2o -ld0 s?

Does a car speedometer meaes.. 4e0)bf03h1t hcsadl crvsure speed, velocity? {speed|velocity}

  An object can have a varying speed if i. 53sgtukaw ,bp9/ lcma98 gg akp-d3nts velocity is constant.

  The velocity of an object can be n 3, yuzf54v t4l ti;m+rhzlc *3ajh8inegative when its acceleration is positive.

  If one object has a greater speed than wi ;m,- 8kbfq lg;u )x,fx0atpa second object, the first must have a greater acceautq x)px wf ; b8m;l,ifgk0-,leration.

  Two cars emerge side by side from a tunnel. Car A is traveli jt ns7.zoe;g2ng 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 higgi lex/,: -acceleration decreases.

  A baseball player hits a foul ball straight up into the air.8.8ftp e g qvviw2euzj l+4,q. It leaves the bat with z8 +.eq,eqgvtl.j2vf p i w4u8a 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, hossgr;zpxs2q irt-d66 7f 6u9ow do2 up7;r x6 st6ozsd qs6-i9fgres it change if air friction is ignored?

  As a freely falling object g)f8ls7jxu1wj -d l3g/qykh6x 0l8hmspeeds up, what is happening to its acceleration, how doe-)0 8u lx yj/sfmlw1xkj73glh6hq d8gs it change if air friction CAN NOT be ignored?

  An object that is thrown vertically up5(x::/ px:,h vfovhd3 cs szlpward 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 bxxlshh/p f(sz :::d5c,v p3voe altered?

  An object can have zero velocity and nonzero acceleration j)m ack/3s6*xndqg,m at the same time.

  An object can have nonzero velocity and zero acceleration at the sa1 e07fcb juhvx7s2+p0z83 h)jq hcjz qme time.

  An elevator moving from the sefb4+nv27u zhe cond floor to the fifth floor making no stops along e4+zh7bf2vu n the way has zero acceleration all the time.

  A rolling ball moves from4.(wh)t gp3) *apim .po cfj29ue fzgq $x_1=1.7 \mathrm{~cm}$ to $x_2=-6.4 \mathrm{~cm}$ during the time from $t_1=1.3 \mathrm{~s}$ to $t_2=5.6 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.7 \mathrm{~s}$ is at $x_1=2.0 \mathrm{~cm}$ and at $t_2=4.0 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps+, f red97 lx-gviv(ef around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.3 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 straight8vxmwb yth,-.kh3 (sp.es+g0biqwxi2 00v kn line, moving 112 m away in 12.5 s. It then tur8qvk0n. -(wse0ii+ts 3kh gpvx. m,byh2bxw0ns abruptly and gallops halfway back in 4.8 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 kcfqd,/z.k/i ttxrqwc;: 9,b $12 \; m/s$ to $24 \; m/s$ in 5.7 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 ks7/iwvi5h.z $23 \; m/s$ 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 speedz 1w:l ::g(sw-iosw yp of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.6 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst : tj0,npjztuv 4bz.x;jcu52pout of the blocks to essentially top speed about :uct jxz5.pbt;240j nvpj,uz $10.6 \; m/s$ in the first 10.6 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 b h,muq *xj(4yfrom a speed of $19 \; m/s$ to rest in 5.48 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a ca .b *e /gdtwpt(dqpy+-gz-n +hg9 kv+yr leaves skid marks 92 m long on the highway. Assuming a deceleratwdngyqt ke*h-d +byvp g g+-(+tz9p./ion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck)7;vup3qj y 9oncgpf- 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.wfe.9/z* bqv5v /j okn After exactly 27.0 min, there are still 1100 mv*9f n5/ boqk/jze.wv to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$