Suppose that an object travels from one point in space to anotqt0r em3u9nz+ her. Make a comparison between the displacement and tt znmuq3+r 09ehe distance traveled.

  When is the average velocity of an object equal to:qo-1*d aem;pegwwk5 the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to 4b v .msw;;-whitb7t/lxld5 wsixty in 8 s". This is a descwb th5 ldmw;-.7 ;tlxis 4/vwbription of

  An object moving in the +x axis experiences an ac(xlr 3pqa *yrs6rz,h1 celeration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car travelqpm0jw*-f-cx ing to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerni-mp *fjq0 cxw-ng its acceleration.

  Suppose that a car traveling to the c+b0tmruu a0: West (-x direction) begins to slow down as it approaches a traffic light. Make a statm0uarb+0c t: uement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a stat( o3n0v3/u:)w viy jvus)8 n ltjyb.hpement concerning its accenov)wb(u83 )l:vhytnj/ i 0u3py.vj sleration.

  If the velocity of an object is zero, does it mean that the acc vsn(d7yf/) fa)u/hj xg,ah1jeleration is zero? Sup,17sujhn x)v)hj/a/ a(dgy ffport your answer with an example.

  Can an object's velocity change direction when its acc8c f6olok; pq*eleration is constant? Support your answer wil6cq;okp o8* fth an example.

  Suppose that an object igj6zt;f, mn88pv 7zi zs moving with constant acceleration. Make a statement concerning its motion wit,zi zj m n8;v6p87zfgth respect to time.

  Can an object have increasing speed while its accelerati2h6 4a csa.rev(,uu, f.xhfb pon is decreasing? Support your answer with an vhr, , p24ufbu. c.a(sxfhea6example.

  Suppose a can, after an initial kick, moves up along a smooth hill9gut8; 8wzhras-h t2)jvd/z k of ice. Make a statement concerning its accelera/z uhw2rzajg s)httk8dv9 8; -tion.

  Under what condition is average velocity eq 4iycfre1/7x5r:g jpt ual to the average of the object's initial and final velocrp e7rt:yci1j/4f5g xity?

  Objects A and B both start at rest. They both accelerate at the sameht+vgq9k8 6;v xqvwl8 rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared 8h6gk9qtvv+q; xwvl8to that of object B?

  Objects A and B both start from rest. They both accelerate at the same rate.zn6 o yrkqx6zllt:3e/ 5* cs(bdxv;x) However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to txs)b( 6*ro:cznezk /y5l3v ;qt 6xdlxhat of object B?

  When an object is released fro1h7raax nns:8tgp3u4)c jww+m rest and falls in the absence of friction, which of the following is true concerning its mo ux43aac1)rw whn+s8g:jtp n7tion?

  When an object is released from rest and falls in the absence of friction, w 3c+amkz jk1m*hich of the fk1m a zj+m*3kcollowing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement ab* w/p4yk /ysq /uoholfts2d/(out the velocity and the acceleration o4lp/ qoks /s /2(/utwyy*dhfwhen the ball reaches the highest point.

  Suppose a ball is thrown strq..-:,,wzaufsl:bef bt rhqmzi v 88.aight up. What is its acceleration just before it reaches its higheset.m,fv.qla.,wh uiz: f b- bqz8 s8r:t point?

  Suppose a ball is thrown straight up, reaches a maximum 6w+qjk bwokzgzy.3 4)dr/+qj height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the bal jz.q++y/owwzkk6jq4b g3r)dl is going up.

  A ball is thrown straight up, reaches a maximu,*1 x * tz3r bvf ab;t19-8utieel fcblawe-1wm height, then falls to its initial height. Make a stat elw*a;we9cv1txtt8u3 z1fla b bb,-fi1er* -ement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of ac -qhhloz+/xuqd4 2 u4ir resistance. Make a statement concerning its acc-4 h/qz4luhxqu +cod2eleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleratiodhdz51f+qwtbjr2jx fkg9b+ g1qg k-+x-.c 5rn when she she re b+tqgk5jgx r dhbrkf5+ g2 f--w1zx 9cdq1.j+aches terminal velocity?

  A ball is thrown vertically je13t0s f+tnb upward with a speed v. An identical second ball is thrown upward with a speed 2v (twicsnt30b+ fj1t ee 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 buildi 6h;zu mic9w+chujbuhd ; /i58ng. One second later, ball B is dropped from the same building. As time progresses, the distance jw;uhz cbm6 9+hcih u/ u;58dibetween them

  Ball A is dropped from the top of a building. Ov .j5i ::mubt.b l/tlvne second later, ball B is dropped from the same building. As time progresses, the difference in their speb:t mu.vtji l/l.v5b: eds

  Two objects are thrown from the top of a tall building. One is thro3y;o l b baq,7j -unk5smg())3r xoxnbwn up, and the 3y7l)bj q; basb-k)3x 5uox(gn or,mnother is thrown down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the topg v f**p:4xw5ntjg9qd of a building. A second brick is thrown straight down from the same building. They are released at thvx :9 nw5g* q4fdjgp*te same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero ve ,oo)9ndw-qmy locity in the +x axis. The position versus time od ym),n9-wqo graph of this object is

  An object is moving with cygk 4q :d/9e.d8ari a8i)sw lzonstant non-zero acceleration in the +x axis. The position versus timeiz8awkg:/id4 .lrqd9 8sy)a e graph of this object is

  An object is moving with zz( vjmsn hhdb .a),)7constant non-zero velocity in the +x axis. The velocity versus tdz . m,h)(7zb)sv nhjaime graph of this object is

  An object is moving with constant non-zero accelerqzp-twb 0xa jb*1v+://o gi ee4v1uc qation in the +x axis. The velocity avjb0x//vb 4 e- ctuw*opiqq1 :1e+zgversus time graph of this object is

  The slope of a position ve6s4gbi6( p duro -;lwarsus time graph gives

  The slope of a velocity versus time graph g1s* epi.: 2fcz;x)q b-ozakcrives

  The area under a curve in an acceleration versus time graphz +jj(qn j t+z6:qx7ta heef 2c8o:j,u gives

  The area under a curve in a velocity versus time graph give12(ek h:tly wns

  If the position versus time graph of an object is a horizontal line, the object bv7a b bs62n:jgne(bi v1:5ven( bvbg76sab: e15v:2ib ne vjis

  If the position versus time graph of anr7(os5 8ktp fr object is a vertical line, the object ispof t58 k7(rrs

  If the velocity versus time graph ejcu k:23g1xn.n y(cyof an object is a horizontal line, the object .u3x ec1c2(ny n:gkyj is

  If the velocity versus time graph of an object is a straight line making an +kgfpo s):f2 rj5o;qbra8 fs9 jhgl7 8angle 89fpsjofj7 5fb)h + rggo ;skqlr8:2aof 30 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance tra sm1cv xn7az)7amlnpo),v i;p u -l6)nveled and the magnitude of the displace))vsxmlpumi a-anzn7pnc6 ;o,7 1) lvment vector.

  A boat can move at 30 km/h in still water. ( c: vev0,evnckfy -ws4c(6boHow long will it take to move 12 km upstream in a river flowv:f cs w(eb04yv6-c(vkne co,ing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = cndaz6ba 4z8x.4/bj ++mkwyv1609 m)

  What must be your average speed in orde lb/2qp6d y4 p(1lngizdyj-4rr to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 minf/;p-ov72bjl y mgx q;. What is the ;b-7vym2 lq pgfo/j;x average speed of the runner in m/s?

  A car travels 90 km/h. How long dktv*pcy5a3-69 xbi+ c w*tl nmcqw94k oes it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one wride8x+hto1(qml6zg+v0v) year. The speed of light is ol v 1r6)mvwzghtx8dq0( ie++$3.00 \times 10^8 \; m/s$. 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 siyl z8(uv0 d2tode for 4.0 s, how far do you travel during this inattentive periot l0vyozud(82d?

  If you run a complete loop around an outdoor track 0pbckw y +q66 1 r d0yuh.e+1cvia-zmc(400 m), in 100 s, your average velocituv-1wqc 01zm rc 6+d+a.yhy60pebikcy is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km eah o9d uk8n)2iast, then 1.0 km north, then 1.0 km west to return to its starting point. d9 nkau io)h28 This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. +pv: 7w .5 zjzxmaq4hzIt travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average vz+wz j7 h:mqp4xvaz 5.elocity?

  You are driving home on a weekenf2 e yek59pjd9d 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 ho2fd9y59 pe ekjurs and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h andz72b6bz:ds 4z oq w+rb 160 km at 100 km/h. What is the average speed of the motorist for this tb7qzw+6zzo : dr2s4bbrip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her aveyuj d yypvk39((- 2-iljj,n shrage speed for the tr jjn( ,js -y(u9 hl32ydky-vpiip?

  An airplane travels 7yr7+y,1r jzfii6 pu lx6i8y9wibt. tat 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed p8tiy9 .zyj 1f bui6,rxiy6+l7tw 7irfor the trip?

  In a 400-m relay race the anchorman (the perso5 /5splch.eed n 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 cov d5pe e5shl./cer 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 8 s. The car kp n409;/kav hwgpt6n's average velocity during deceleration was 68 km/h. What was the car's deceleration k n/n ptg9kvpw64h;0awhile slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average rate o:,yhj oq re5h+f h5 or:+,ehjyq$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accele he q7zv o2852jonr1g7ig;no ,n5sruxrates 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 res.de i1b*hqw m 1/p7:-9upafiof3ffcat 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 with a constant j0uu7vpkpizr13- 1iz)vmcfyv4 ), dx acceleration -),i 7c4 xijf) vvpz km1p3du0y vz1ruof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velo xdz00xf:w0er,mg kc7 64hdfco*u phk0wj /2jcity of 6.5 m/s experiences a constant acceleration o g6m pokx0hzfd j4uhj f0k0w/cx d2e*cr0 :,7wf $2.0 \; m/s^2$. What is the cart's displacement during the first 4.6 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a spep5cn8(;fmdbi e1,kqsiei 1 .eed of 323 m/s strikes a sandbag and penetrates a distance of 97.15 cm. What eic1iqnp,f(m 8s1 d e.ik5eb;is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from apki*2t )mv. ws catapult 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, )2i.swmvk pt*what is the length of the catapult?

  A car starting from 9,+vledlmpk j+yao/zs 5f 8vz.3 qmp+ rest moves with constant acceleration of $2.0 \; m/s^2$ for 10 s, then travels with constant speed for another 10 s, and then finally slows to a stop with constant acceleration of
-$2.0 \; m/s^2$. How far does it travel?

  A car goes from 40 m/s to 80 m/s in a distance of 200 m. What is its averagev--rig7rt7q9xo jm ot ; e7/nzub fc75 accelera re7tfxnj7mg ub t5/-zo9rc oi-77qv;tion?

  An object starts frozzso mg05.l ,sm rest and undergoes uniform acceleration. During the first second it travels 6.1 m. How far will it travel dur5,zo s.m 0szgling the third second?

  An object is moving in a straig.c5bh )hm;4ci/h tsujg6 u3eaht line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this ti/ 63h jcb;ehs)ct4u.gmi 5 uahme?

  A car starts from rest and accelerates uniformuuf ,j-) +lyqfly 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 deceletmq;/n mc. f1hd/a/ip+ gy35k e)gmpt rate 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 waiting at the i)(b9 mvc xkk;nntersection starts ahead with a constant acceleration cb 9(kv k)n;xmof $2.00 \; m/s^2$. 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 wit02j u(; xq*moh mh4xk 7g l(stmlsnm.(h a speed of 12 m/s on the surface of planet X where the acceleration duh2*4;7gmktm nomss j m l(hl(q( 0ux.xe to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of 12 m/s on the surface of planet X fh*pqhv6qou.kcp /f 0i(w z n;xy,r+7where the accelerhovh7qfy+ fwx (,r/pk ;i.c0pn 6*zq uation 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 plan /mvel3fju m2xj/bq)f76u +xlet X where the acceleration qlm xvb/2 7j) mlxjf +u6fu3e/due to gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

  An object is thrown upward with a speed of 14 m/s on the surface of +bk1 kz1axd o0planet X where the acceleration due to gravit a11bkk+doxz0 y 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 friend ho:dqx 6p x3trc;lds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall b;dp36xxc rqt :efore you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. (cmlriuit(7i (,n4sdko*zc1ui, / bd What is its velocity after 3.00 ss7 mirnuc4lb tdicu(*z/ (,ii1(o, kd?

  A bullet shot straight up returns to its starting point in 18 s. Whf o) 6c55ckutmrj9 ef37znf4dat is the initial speed of the bullfcfrcuf64 td7 3 95)ne5komjz et?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does i hos9+(t8m-p qa wz;0 qmuuvdzh6.ru7 t take to return to its starting poid6.uswua0h p r-mtqz8v +m7(qzh ou9;nt?

  A ball is thrown downward from the top of a building wi1ta .sptdyx82th an initial speed of 13 m/s. It strikes the ground after 2.9p2y . sa8dxtt1 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only f: lk ok.qvpon(.2i*z *u n:mt/e+pc qmill in numerical value in the bvl*2cm(:p m/.q nu o:izpo*. kne t+qklanks)
(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 wrw8y*hh-c 0v tith a speed of 42.6 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 7 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 7.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity ahe8r2qn)kb +oioto5s q*0 d5 .wvdn w,t t = 1.0 s?

  In Fig. below, what is the velocity atu x7c.e8y wl+goqr-; y,6xiw k t = 2.5 s?

  In Fig. below, what is the velocity ad 1puzj;)cg1 at t = 4.0 s?

  In Fig. below, what is the velocity :a;n2 3t p e 8yfcp8cjeija.(pat t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 xbpfpzm4 w:x9s+( x*hxe) ,1fv8 yrobs?

  In Fig. below, what is the average velocity frotq:w u9ajm rbrkdmb,- ui z:5qw:o(.5 m 0 to 6.0 s?

  In Fig. below, what is the acceler -dmvv8th q6 j1y9whbl no,/.mation at 1.0 s?

  In Fig. below, what is the accwnxo q/iw8 xcpcn:*s9bh2 e*5eleration at 3.0 s?

  In Fig. below, what is the average accel91*eafx vr;arvddl40eration from 0 to 5.0 s?

  In Fig. below, what is (xss1eajg l9 g8g9 r(mthe average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement/*.kx2z q gwnw:gmj :d from 0 to 8.0 s?

Does a car speedometer measuregalm/yxxm445r w )bt) speed, velocity? {speed|velocity}

  An object can have a varying speed if it6 3oau4q h6dj pxiyp:2s velocity is constant.

  The velocity of an object can be negative when its 3pll(o 6q*w- gc jjo3+gzi+zbw ,rm8iacceleration is positive.

  If one object has a greater speed than a second object, the first must have a2 am6d:smm1mt greater accet :s2 ma1d6mmmleration.

  Two cars emerge side by side from a tunnel.yso2u mz6hqk b798 fqpy.( q*f 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 acd 7,me sq/zfc+wnf5n6celeration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves the bbpi qvsdyy gl4;ca3e *;6 0e-sat with0 esl43g i6cpydqya s-;ev b;* a 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 hauyzwh *1-yz kx7r/; oyppening to its acceleration, how does it change if air fry 17 y yx;*hzzurokw/-iction is ignored?

  As a freely falling object speeds up, what is hapmmb j.0wk +.wfpening to its acceleration, how does it change if air friction CAN NOTkw m .fb0mw+j. be ignored?

  An object that is thrown vertically upward will return to its original poijne:6vc qy snl v/ n,.c*/zp:sition with the same speed as.nsve/::yi6z,j p /nc*vnc q l 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 nonzefdyajfa riq 41 :qq5-zx 5hg/6ro acceleration at the same time.

  An object can have n-ecbtx e) p*3drx(9 hsonzero velocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor makix,m;y fu0)a xwng no stops along the m,x wax0 y)fu;way has zero acceleration all the time.

  A rolling ball moves froms,3jr6 ehbyi.b 5x8c d $x_1=2.9 \mathrm{~cm}$ to $x_2=-4.4 \mathrm{~cm}$ during the time from $t_1=1.2 \mathrm{~s}$ 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 $t_1=-3.0 \mathrm{~s}$ is at $x_1=2.4 \mathrm{~cm}$ and at $t_2=3.7 \mathrm{~s}$ is at $x_2=7.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quacut )6x trbk(*,eaj5,i.fxu23 mrqgirter-mile ($1 \; mile = 1609 \; m$) track in a total time of 12.0 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, moec,kle3u 7g5fk s(e+)rw+t p qving 87 m away in 8.1 s. It then turns abruptly and galft(+qer3 s5ke7, le) wkgcp+ ulops halfway back in 4.5 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 rpr2fsfoor 5i 5r3,elo-:v6eom $10 \; m/s$ to $24 \; m/s$ in 5.2 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 0q/knrt iav-d3d rz 0vry9n26 $17 \; m/s$ 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 of yxc i8;1izj3qf aa b+v0i6zfkb)f ;*q$28 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.2 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to es;zun pn(v2 xjg 19-vsosentially top speed aboutox2;9 ngv zupsn1 vj-( $11.2 \; m/s$ in the first 13.5 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 uni gjchm cmk-2+-agbic vr1 .q+1formly from a speed of $16 \; m/s$ to rest in 5.71 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leavv ,s8mxgf,aw3es skid marks 92 m long on the highway. Assuming a d3w,f msax,gv8 eceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck go attb(u0 bder wwkf76o hx7,83b3ael9ing $25 \; m/s$ 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 lessdtt, jfg* 9e. z1(ifan than 30.0 min. After exactly 27.0 min, there anft j9zaf .d* it1g(,ere 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?    $s$