Suppose that an object travels from one point in spac rcp2q*.xaupo 6pb.,ie to another. Make a comparison between the displacement anpq6ixcbur.2 p.* a,pod the distance traveled.

  When is the average velocity of an object equaln, lxvac ue,k67 h+oa+ to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty iniaac5)qad .o i* y)6me 8 s". This is a descripti6o) y.aic mida5a q*)eon of

  An object moving in the +x axis experiences an acceleration of +potg7;2z j qk*x/aum $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) b9e(-:+a3qjcdtwz e(ch; cymkegins to slow down as it approaches a traffic light. Make a statement concacqj9tw(3-yz : e ;c+h(d mkecerning its acceleration.

  Suppose that a car tr(-0uxvb;7 sk(cr((pvt e, xjs hqv)ua aveling to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerninv)evj pu (s( x0bt qr7,k x(v-ucs;(ahg its acceleration.

  Suppose that an object is moving with a const )p/dzg d5uk(xant velocity. Make a statement concerninxp u(d/5kgdz)g its acceleration.

  If the velocity of apsnp/pnhd -3 0baj. k6n object is zero, does it mean that the acceleration is zero? Support your answer with .6ap3s/-hpn b 0njpk dan example.

  Can an object's velocity change direction when its acceleratiq-/ kco,9 uh2yh j,2mb*akgxy on is constant? Support your answer with ackh b- m2u *ay2hj o,gy9/qxk,n example.

  Suppose that an object is moving with constant accelerationgzh wa*v4ls:c f39 u,o5f8jpx . Make a statement concerning its motion,jox48*plcha9 v3 5 wffzs: ug with respect to time.

  Can an object have inc-6kj, ztv nto3q1r/:fubdi: g0 uc.ppreasing speed while its acceleration is decreasing? Support your answer with an examp-vp q6 u uktb/:c.0n3i rzg:p ,dtofj1le.

  Suppose a can, after an initial kick, moves up along a smooth hill of ij8,f q;qe t (83jqryoice. Make a statement concerning its accelerajo(re 3 q8q8;jtfiqy ,tion.

  Under what condition is average velocity equal to the average of a ;0q, pxo s)f1l,g8ehyatmaq0b. y8u the object's initial and ,8gal 8qea ,h mu poabty0xf) q0.;s1yfinal velocity?

  Objects A and B both start at rest. Theyszq z:zwhk0x( lc6 n,jf,k) ice.j e2,:n gxm7 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 compared to that of object B?q z 7 jehe 26wc)gk,zx:if x.m j0cn:klzs,n(,

  Objects A and B both start from rest. ++dqzv.ta4: /dm 5:a2jbxec lxx(nw x;m o1khThey both accelerate at the same rate. However, object A accelerates for twice the time as object B. /:wxb hxelxx tdov jaamn 2k4m; d.1q+(c5:+zWhat is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falc3l 6s2.t3sot1q by bals in the absence of friction, which of the following is true concerning its motion?1 o.l23b6y3as tqsbtc

  When an object is released 5p8cn tykhve +af k(tk8em ;7-from rest and falls in the absence of friction, which 7ma+f 8v tcek y5 ke;h-t(8knpof the following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the veloc2a.ro.t c/fnndt n:vgh45 8w aity and the acceleration when the ball reaches the h .w.2 f4h8rvct/ot:adn5n ganighest point.

  Suppose a ball is thrown straight up. What is its acceleration just wvx-s:hywo(,ql 1q8q before it reaches its hiqq:lo(- ywx,q1v 8swhghest point?

  Suppose a ball is thrown straight up, reaches a maximum h zyws5 jqzyui( p68;y)eight, then falls to its initial height. Make a statement about the direction of the velocity and jziypwy(8q5 sy) 6u;z acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum heightd b621rbs.h/j xv+ j9f0 omds0jrt6 kk, then falls to its initial height. Make a j6069/+orbm1v 2s d jjf0bs.xtdrhkkstatement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make a sta,ygj: y,*so phtement concerning its acceleration. *p ,:syygj,ho

  Suppose a skydiver jumps from a high-flying plane. What is her acceleratio 7oj0pai 1u .qutslrmf-; jc 67cn7nl5n when she fqn-1taoi6up5.u0cmll 7j;n7j rcs7 she reaches terminal velocity?

  A ball is thrown vertically upward with a pyic96jx(tm3 ;l kv6cspeed 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 timk6y9cx6i(j l3tc;v pmes higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One s4vg/r f:5exbcwv(1is econd later, ball B is dropped from bie wcvfvxr (4/:gs 15the same building. As time progresses, the distance between them

  Ball A is dropped from the 0ne-q8wnl1 k9 llx 2ler r*mn7top of a building. One second later, ball B is dropped from the same building. As time progresse n2nx*lm7eqlrnlr89l 1-e w0k s, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up,zzs:gyn0l lu+,w cvo6 *-f;j l and the other is thrown down, both with +f:;zncll*u6 yl gs, -wzv0oj the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the zm:7t8odwl-se2ag*pazhsw f-9m/f dq0b0q, top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Negle : da-z, /87mbhet0 gzpq-wdm a2* qolw9sf0sfct air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero vel-617+ub ihg mq4z ral h77t,sdj go+wyocity in the +x axis. The position z t-s67 m igwhbao1r77+yu 4g qd+hlj,versus time graph of this object is

  An object is moving with cc0n80qo t1-y dtr 4rasonstant non-zero acceleration in the +x axis. The position versus time grapho8 dr0-rst0qt14 cnay of this object is

  An object is moving wi9z n 2- e+zgg-rvajg-oth constant non-zero velocity in the +x axis. The velocity versus time graph of this o9nz r2-a+vg gog-e -jzbject is

  An object is moving with constantb -tl c o:so,:x+l9gm .qmzra5 non-zero acceleration in the +x axis. The velocity versus time graph of thisc.q5m9 lr,t gz -o bl+:smxoa: object is

  The slope of a position vers n2u gsfy56oqk2rpk3 9o2d3vlus time graph gives

  The slope of a velocity versus ti0.hc:, hd jaak ybb35lme graph gives

  The area under a curve in an acceleration versus time graph gio u+hab 54nr:5 1ottgaves

  The area under a curve in a velocity kq)la/rz67la+x dmhaa ;h; o -versus time graph gives

  If the position versus time graph of an object is a h6qc:k(b5oele8bs ;phorizontal line, the object ikb:qpc6l(;e 5ho sbe8s

  If the position versus time graph of an object is a vertica i 7flgrhqpo7i7+1cz;l line, the object is ;lgc+zpi 777hif orq1

  If the velocity versus time graph of an object is a horizontal line, the object q;yb rr(;fof* sva 2mi8g(*i xby qfr xm 8(gf(*iia* 2vros;;is

  If the velocity versus time graph of an object is a m. jlba:hq.i*yvo6s)a/0ao jstraight line making an angle of 30 deg )6b h:l */.jyioams0aaojvq. rees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find+sr/i9gts ol : both the distance traveled and the magnittl s+9r:g/o isude of the displacement vector.

  A boat can move at 30 km/)p8g3 )xsltj ah in still water. How long will it take to move 12 km upstream in a river flowip) )ajx gtl38sng 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 m)g ufvoy+g 87(n

  What must be your average spo-mj: 99l pkr.ejs:3zj 0wo.c 6ev qkxeed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately l,:h.n ,2r:svs .bdxbr;es wg42.0 km) in 2 hours and 57 min. What is the average speed of the runner in m/sb, r:s gel.xswd. vbr:;,n2hs?

  A car travels 90 km/h. d iy c i;1*i a;sab31t/n3dphe How long does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. The speeep r be//:+bied of light ii+b: pb/e ee/rs $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/u)z8ia* wcck.zou00; oa: acph along a straight road and you look to the side for 4.0)u00a pac8.k oiz:ouc;azc w * s, how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor tip38hiz.p sind.kp .g 9ax /2grack (400 m), in 100 s, your avera 9iip p/ni2pgza. . dhkg38xs.ge velocity is

  A polar bear starts at the North Pole. 6:+r2; z* 9jz aq c l9jacwh-qklutjr6It travels 1.0 km south, then 1.0 km east, thenrr9c -qq2*6: lu l9+; kt6jahzzcjjwa 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 Pole. It travelh jb)1ct(,:qx7hm le gemjr8 i+(:ig as 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 wasa(em) rh8hj,:ix71ej(gm :b+il gt cq the bear's average velocity?

  You are driving home on a;e.gc3ltnm7-u 2edt h 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;3-uh7dteemtn.c gl2 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 kp7cpi y 6b/+bjp( rll7m at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this tbl7 ilp6/(j+y pr bpc7rip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is pkn4 qfcg,e.lp3k ix/7 p2n 1dher average.4epl1 7k nc/kdpnxg,2qf3i p speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h northv-dpm(db h. z/ for 750 miles. What is the average speedmd/-vd (.phzb for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) foos rtqy19fr5a 5me7 mf46h:gw r team A can run 100 m in 9.8 s. His rival, the anchorman forq5fro9gs4er71 w6m ahtf:5my 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 acz1 k(/ -gw7 1z)f 6ctotvylki6 4jgpk stop after 12 s. The car's average velocity during deceleration was 70 km/h. What was the car'g17f4z -wpj61/)klz(io k6v t c ygckts deceleration while slowing down?

  An airplane increases itsla oig;yykv 3(:z*1l9wck oq7y v;sy0 speed from 100 m/s to 160 m/s, at the average rate of ilyckvya7qy lk*gv;0s( 39y o;:1ozw$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerate1w0 tnk1u2lbzs 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 rw - dtlcemv k;kyw*4nf ;f;p1*est and 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 ra 2dqgegmw. 4 4n3(wzwith a constant acceleratioeq44mg ngwr .(a2zd3 wn 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 5.6 m dwn dvw0x*4a*/s experiences a constant acceleration of4dw*an d 0xvw* $5.0 \; m/s^2$. What is the cart's displacement during the first 4.4 s of its motion?

  A bullet moving horizontally to the right (+x directda cb:zf9z+acy /4 / p(iwjp:nion) with a speed of 207 m/s strikes a sandbag and penetrates a distance of 39.52 cm. What is the average acce zjp/fia:9 +pa4n(z: c/bdywcleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft cqw(a0e 1;h -z kevdtga9yp1.r, cf-ngarrier. 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 is the length of the cata,gg-dt p (vwehr k- 1c1az;ey0na9q.fpult?

  A car starting from rest moves with constant acctwyt grsq +xonq/9n7(3 7+ lwceleration 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 200y7uic1w g:j /y3ttuu( m. What is its average acceleratjy1u3gt7u uiw /:tyc(ion?

  An object starts from rest and undergoes uniform acceleration. During the first u0etk)faf b406vw8zz2bus -p second it travels 2.8 m. How far ue2 -v08z4atf uskz6 bwfpb)0 will it travel during the third second?

  An object is moving in a straight line with constantpim5f1vt .wsbhv co 0mv-vx*o52 k r,4 acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m5,b vtoho4.kv scp2 ivx5-*v01r fmwm/s. How far does it move during this time?

  A car starts from restf1 *ial*bim1h and accelerates 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 *1jbm sid,bp:*f25prppi5dr +;rum va dry road 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 light tuue zn7/4nno9s.mtq: srns green, a car that has been waiting at the intersection starts ahead with a constm9s:.q 4nzenu7o/stn ant 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 planet Xcj-/ v*ckp7 it where the acceleratio- /pcc7vikt* jn 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 8b.zfajmqx 0*7 l ey:ron the surface of planet X where the accele 0 7br*l8.zmy qej:xfaration 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 skbll*- v 80g(q 9mz;knxnfm e 36euuv.peed of 15 m/s on the surface of planet X where the acceleration due3;uz-kfnk.m0ex8ln( 9 * vgebq6u vml 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 speekadq(x+k mgba 2me x,2p7(6hdd of 14 m/s on the surface of planet X where thdm(d2p7m 6x(kg+ ba,hq2a ke xe 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 greater than 0.10 s. If your hv;uzl /8iy g(.y a:fofriend holds a ruler between your fingers and releases it without warning, how far can you 8ih g:o uyz/l(; vay.fexpect the ruler to fall before you catch it?

  A ball is thrown upward..lnd .;7l /v5evmf,gy ipuri at a velocity of 19.6 m/s. What is its velocity after 3.00, /evlfu5mv;igp n.7 i.r.dyl s?

  A bullet shot straight up returns to hu-i)uad)0(tj6yn /kixo6 9frl odg 0its starting point in 4 s. What is the initial speed of the bul)dk6goyrfu)6uoi0ia xn0l t dh(9-/jlet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take totw i3h7.6+g em rgph+a return to its stw hh3re6gai.pg+7+m t arting point?

  A ball is thrown downward from the top of a building with an initial speed of 95nh w p kxuclm7 v.7:r4f b:mgbgbin;+43(wpb m/s. It strikes the gbgnm 77vp:4uk b5;:wmfpi4c rhnlg. bw b3+(xround after 1.8 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill kpz(x 3;d*i 9hww zx2v )nef5 m-;xnarin numerical value ixk; ap 3; mzevzwn 9-r2xixn)d5(hw*fn 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 thejz p5aab:2ncrb(sp3 y 7 g jl7/0sw3wt air with a speed of 30.9 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 9 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 9.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velociyp+8)*4 r woed ijw1c5o,npkpty at t = 1.0 s?

  In Fig. below, what is the velocity at t = 2.5 (s h wz9rg(9aowpv4,a*vdle)s?

  In Fig. below, what is the velocity a+ch qz +f4qa hd57iej4t t = 4.0 s?

  In Fig. below, what is the velocity a ,zkre/uz.i.4r9b-tc oho .do t t = 5.5 s?

  In Fig. below, what is the average velocity froxs qjc.9u3jt , f*qft7m 0 to 4.0 s?

  In Fig. below, what is the average vkhf ;c/6or4pp elocity from 0 to 6.0 s?

  In Fig. below, what is the accelerat*uo ;o .g)cugvion at 1.0 s?

  In Fig. below, what is the acceleration gbjk j7a,js +qu:9/lf:j2 vmk at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0 5d1coow8,j9bmy g8 /win(5pv tm 5bem s?

  In Fig. below, what is the average acceleration fr1l(8 83 e /vdnrr inllitgj*rob77 d6nom 0 to 8.0 s?

  In Fig. below, what is the displacement frzk(rdzqk- *j 1om 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speehhoe23sxkotq ohd y, 0y.4efp;-1c+ cd|velocity}

  An object can have a varying speed if its velocity i5ynxx n9svin o.,a2bqajp22 ;( ooeg(s constant.

  The velocity of an object can be negative when its accel1w) rv(bja+cux n/ b,neration is positive.

  If one object has a greater speed than a second )nm:oaohql-c/ ap7s;object, the first must have a grs ;a-a/hmo)c lqon7:p eater acceleration.

  Two cars emerge side by j4akon9,j0 sxj(3 tywside from a 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 as its acceleration de d2w fq9jd xdkf-y50(w;oe+ w qzvw8,kcreases.

  A baseball player hits a foul ball straight up intoms /ll,zq4(t4 )rl7hsf xcue 8iebm86 the air. It leaves the bat with a speed 4m4/e,hzcl t(ss8 eubf 86xl 7)r qmliof $120 \; km/h$. 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, whputap7kd r * 41by6r l4c(ko+aed5r- sat is happening to its acceleration, how does it change if air frd-b p ar7ct kk* rs4d16e4oa (+ru5ylpiction is ignored?

  As a freely falling object speeds up, what is happzni y* e87pk,mening to its acceleration, how does it cmke ,*znyi7 p8hange if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its origq bkp 2m6 /bz eg.v-hey,3xq7zinal position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable,,q zx6mbh27e -vpyq b.3 ke/zg how will this result be altered?

  An object can have zero velocity and nonzero acceleraz ;o,h z)o; b-lqr0zgkul z--ruh+r ;vtion at the same time.

  An object can have n jx wipcevqr5/ ufoj1+k.m:05onzero velocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no 5xo re)n(v rs0stops alonv0n xe()ros r5g the way has zero acceleration all the time.

  A rolling ball moves from 0rff/m5ffjzrjm (f1+ g x(rx9$x_1=3.3 \mathrm{~cm}$ to $x_2=-4.4 \mathrm{~cm}$ during the time from $t_1=1.4 \mathrm{~s}$ to $t_2=5.7 \mathrm{~s}$. 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 $x_1=3.4 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-milexva8 hz( ga)5x ($1 \; mile = 1609 \; m$) 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 traine7e .kflum/g;s r in a straight line, moving 102 m away in 13.4 ;7/k.usfmgles. It then turns abruptly 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 on ja-+t0(p rn+ 3ncib$11 \; m/s$ to $24 \; m/s$ in 4.0 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 fro /-jyvh8n lsv,f h,)tkm $19 \; m/s$ to rest in a distance of 72 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed9/ y;nx1i7so +doii he of $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top speed axyd*/g y-b4lhrn qt33 boutldbngx3/q *4t yh 3-yr $10.3 \; m/s$ in the first 12.6 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 from a speed q) hzqgn 8.yp/*urm6x1+z gk jof $18 \; m/s$ to rest in 4.85 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marizh n5mx72p-vyj- pm/soq1 l5 ks 92 m long on the highway. Assuming a dj5n-v1sixy7q2/o h5lp -z mmpeceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goingl8 kj 8fz : +9fxl)fbczym, o)sc(lll/ $25 \; m/s$ 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 .dfe.xu 5c; . wp9ahgwthe 10,000-m run in less than 30.0 min. After exactly 27.0 min, there ah5 xwp.g.dea.w9u;fc re 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?    $s$