Suppose that an object travels from one p4 fthuy4(oiu i:zy y4h/ )ie9ooint in space to another. Make a comparison between the displacemf 4i9 y y(o4uty4z:/hh)ieui oent and the distance traveled.

  When is the average velocity of an object equal to the instantaneo5) sf9bqymfirb q;kl08)5 pvh us velocity?

  A new car manufacturer adver9 nnr jo/g r)xi,-r7bdtises that their car can go "from zero to sixty in 8 s". This is a descriptg- jobirx,n 9r/n7 d)rion of

  An object moving in the +x axis experiences an43dz,3x b c jfs-eyqz, acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car travelti*jt(.dj * 8 efax f;d *cs8s:5qmhvding to the East (+x direction) begins to slow down as it approaches a trdjds(t8ae5i mxsc*; hfq*jv fd 8t*.:affic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to b;4(tt:fda(wvgt8 vomt -csk ;m z :c4slow down as it :(dmtktcbwmcgt;4t( a8f; :o 4-vv zs approaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a consx0snvd5iumst 5/ (z p9tbsz0:tant velocity. Make a statement concerning its acceleratiztuvip(s50sx /9 z: dtsbm 50non.

  If the velocity of an object is zero, does it mean that the acceleration is n a7tb+mnh.wi0c)k /h zero? Support your answer with an exa0t7 b a hhnm./)k+cwinmple.

  Can an object's velocity change direction when its acceleration is coxt/vm(cwutk ,w32,njnstant? Support your answer with an ex/muncv, j3,wk t(tw2xample.

  Suppose that an object is moving with constant accelerat7tqo1 qr5w qbn yr+nt:gu40:cion. Make a statement concer+bu7:n qq0:twr1tqg y5 o c4nrning its motion with respect to time.

  Can an object have increasing speed while its acceleration.uac2dwil w83df7b(4 + bqgok is decreasing? Support youf(b3g couwl+.awiq8kd 27bd4 r answer with an example.

  Suppose a can, after an initialxyskoy 0* ix1bn)d 6m6 kick, moves up along a smooth hill of ice. Make a statement bxx* k 6sy)y0ni6 md1oconcerning its acceleration.

  Under what condition is );li3byzgq t1izb.45 f-ryrp average velocity equal to the average of the object's ini4zg- izby1)rf 3tl.;bypr5 q itial and final velocity?

  Objects A and B both start at rest. They botus zwm2*-io b6h accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of objecu 2-swi oz6bm*t A compared to that of object B?

  Objects A and B both star ;ttv7ho4 (xsrt from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as obje4ho;xrts( tv7 ct 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 absence of friction, whic. nxgtz-*-v ymil9ox2 h of the ixy-*m.2z9n-txv oglfollowing is true concerning its motion?

  When an object is released from rest and falls in the absenc o8xwx70 zs:jita 03zze of friction, which of the following is true t30 jx8:zz7xazi0ws o concerning its motion?

  Suppose a ball is thrown straight up. Make a s12bi/ bhv7xon tatement about the velocity and the acceleration when the ball reaches the higbb/nhi 2o1v x7hest point.

  Suppose a ball is thro 60uq5slud warol8/imjx6 )ttx3,+sawn straight up. What is its acceleration just before it reaches its highest l3ud l/t s+6,q5x6ariwst0)8a umx jo point?

  Suppose a ball is thrown straight up, reachehpf,oogn:z ty+*, 0c 6 vdl:oss a maximum height, then falls to its initial height. Make a statement a, hot*co dzvg+,p:sfo6n0l y:bout the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then fs:x/8af7 s b2t4oe npballs to its initial hei 7f /2texs:b a8spn4boght. Make a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in th wk5asn65sq4;6 rntbpe absence of air resistance. Make a statement concerning its accelern6nb k5qp6t5sars; w4ation.

  Suppose a skydiver jumps from a hi/ r1zjyikc2e(mpzwi9.7ia l)x w m5s 6gh-flying plane. What is her acceleration when sh)5w27 azwmli6mjyii (9c.pxe1s/zk re she reaches terminal velocity?

  A ball is thrown vertically upward with ajk, n0 rpi)8 l4vbtxl0 speed 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 times higher does the secojpl,4vk 0 l 0)nx8irbtnd ball go than the first ball?)

  Ball A is dropped from the top of a building. Onzbyfvkr80 5 /v*lx wp.e second later, ball B is dropped from t0bk.8lvx/v py5wrz f* he same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B is wfbb* xo2l fvnl,v9.1dropped from the same bu,1lnwff*.x2b v obl9v ilding. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thro,nsr;ovv:j , fwn up, and the other is thrown down, both with the same initial speed.s,;n:vorvf, j What are their speeds when they hit the street?

  A brick is dropped from the top: jxv*orud g7/yfac dc440 zjg8i*/my of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bric gr8gfz7ad*yyj m:* /od vj4xcc0iu /4ks.

  An object is moving with- v/tpf8m2c zh constant non-zero velocity in the +x axis. The position versus time graph of tm fc vp/htz-82his object is

  An object is moving with constant non-zero acceleration in the +x axis. o-43uk cdgq g+The position versus t4ko -gc3gq du+ime graph of this object is

  An object is moving with constant non-za mb r0w- j7/ehiv 6uzh5p0rm:ero velocity in the +x axis. The velocity7 mi0pj0vru w/hermb-:ah65z versus time graph of this object is

  An object is moving with constant non-zero acceleratioyk dq25(tixd3ts 89kz n in the +x axis. The velocity versus timzsy i9ttd325qx(k d8k e graph of this object is

  The slope of a position versus time graph givesg kwtcu0k(+3e 9qwg qx88 dke5xbv 2q5

  The slope of a velocity versus time graph givesl+n)g3-ppr v r;)wkhy

  The area under a curve in apk7k,anc ( *8cmxwb7 kn acceleration versus time graph gives

  The area under a curve in a velocity versus time gr rm04jdwm;*my aph gives

  If the position versus tix t1j iaw9 3g(o qc8d,im4km5xme graph of an object is a horizontal line, the object i5q(jto m,391kgxi8a i4xc mdws

  If the position versus time graph of an object is a vertical line, the objecal. oiuc-n qhv9uer2: a9yr4,t islycr . a 9unuiov4a-9r q2:eh,

  If the velocity versus time graph of an object is a horizontal line, the objepd42 p,iw7umpct iw7p 2 4updmp,is

  If the velocity versus time graph of an object is a spwfer,htbvxpxdoss5x70 5ug o7; - /) traight line making an angle ofx5h)tpxs 7v5 0w7e,orp-bgus fo;x /d 30 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.;ltvdhu: +6ip, + zjig0 m south. Find both the distance traveled and the magnitude of the di6 pj+ilig;zt+hv :, dusplacement vector.

  A boat can move at 30 km/h in still water. How long will it takb mxs+lz3ti4z9 f7u:se to move 12 km upstrzi+9uls: m3t x74s fzbeam in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 4 tkxnpw7 uvia: 26h6hdky)g0 -k+jz m1609 m)

  What must be your avr, .x x 6jyk0q *fk14lq,zfgiwerage speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 :dgfxl1cnd )vx; z *ev tiu4s6hs/v24km) in 2 hours and 57 min. What is the average spe cin sxuvfd/;: d4)l46eg *2htv1zsvx ed of the runner in m/s?

  A car travels 90 km/h. How long does it trc dx:pu 0u5emx)kc3/ake for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year.*75xrgd ib gojb -ce:2g,nk 8c The speed of light b5r- cg,je8gg2d xcoi *kn:7 bis $3.00 \times 10^8 \; m/s$. 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 awqbq :sf pma3y ( 0)d3g)r(wdu straight road and you look to the side for 4.0 s, hs(a)03qw )qwmd3p gf rb:u(yd ow far do you travel during this inattentive period?

  If you run a complete loop around an outdoor trackagnzi2n3 y t)cqk50 1h m9ra1x.v vj2d (400 m), in 100 s, your average v2 h2 k0 xzqiac1.dn9r5yma j1g nt)v3velocity is

  A polar bear starts at t;9 iwbw.hetm0 he North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to retubewi0t.9 h wm;rn 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 travels 1.0 kmj-/b4 wb1oageoqqt6t l:0s/y 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 veloca eo/wt41/0b- :b oglsq6t qjyity?

  You are driving home on a weekend f enxkg- tc8jq -6-l7fisql+l+rom school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arriq6qn-sj 8l+c7fe ll-ixt-g+kve home after driving 4 hours and 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. What is the avem k,6ljvupm6ay;8g5 zrage speed of the motorist for thi puzv6y5m k8,mg6; ajls trip?

  A motorist travels for 3.0f53g yfsa n ff,z5nd6fl zby9g6,*ky- h at 80 km/h and 2.0 h at 100 km/h. What is her average speed fo,f-fgs kya9 fzng5b5 6*ffz ,d ly63nyr the trip?

  An airplane travels at 300 mi/h south for 2.0yf2 prqc6b5d4x;*9 gptaqlv ( fn5c5f0 h and then at 250 mi/h north for 750 miles. What is the average speed p6(alfy*gx 4;2n9qfrcctpv5fb5 5q d for the trip?

  In a 400-m relay race:/0r dchio-z a the anchorman (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 leahori/a z: c0-dd 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 stopdv a,v(ug8dex f0dg/:w5 qp;f after 10 s. The car's average velocity during deceleration was 56 km/h. What was the car's deceleration while slo5da80gfg dx,w dv/vef:u ;( qpwing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at q-s952 fe ffrjthe average rate of fjefq rf9s-2 5$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/)5l2, pp-gn+uclozws .qyg. ;s 0yxfzh accelerates at the rate of $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and accelerat lh4k7owsnn:) es 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 w6oe. c);m an9( hqj okt9ouzq*ith a constant acceleration9m(eho z6n*u o .tcjko9q;a) q 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 1.6 m/s exp13; 0 cvmeu)fmmtnnu3eriences a constant acceleration ofetmf m;n)uc u33nmv10 $4.1 \; m/s^2$. What is the cart's displacement during the first 4.5 s of its motion?

  A bullet moving horizontally to kr 1ym3 z-kvv*the right (+x direction) with a speed of 299 m/s vvz mr1-yk k*3strikes a sandbag and penetrates a distance of 67.46 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from:qtlr rv;/ kxfw nt 0e06y)r1f a 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 constankt1exry :0w/ t n)frvr0f6;lqt, what is the length of the catapult?

  A car starting from resihkmlm 4ihk i*ldn32*1 -xbnr hm06 t)t 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 inl ex.xxr.yfl;(8 hyd x7ny0 j8(h kw9b a distance of 200 m. What is its average accel xkx(9x l (lrj.. h8e7nxy; 0w8yydhbferation?

  An object starts from rer)id6 gxx03on** ae bvl)y ,nxst and undergoes uniform acceleration. During the first second it travels 2.6 m.e*n,rgbxd3yixo) n 0)*av lx6 How far will it travel during the third second?

  An object is moving in a straight line with constant acceleration,7r jqc2s5ue sh. jltrre 95i5a;)jln. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far do5rjn,;j9 aj5.t5r csrhllse e2q u7)ies it move during this time?

  A car starts from rest and accelerates5bqxl. pu)j3n i,y sl5 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 a dry road can decelerate at ab* ff-u :3va0ybi. +d4puqsp crout $5.0 \; m/s^2$ 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 tuw vlm/t3q3;vgbe2i t (rns green, a car that has been waiting at the intersection starts ahead with a constant accele3 3vtb /e2;(itwvl qmgration 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 upwarpho1/ btpv1g. a4t2t yd with a speed of 12 m/s on the surface of planet X where the acceleratg ./t1apovp h1 4bytt2ion 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 on the surf2,mo7pf qau:xil cab ,smz*51 ace of planet X where the accelerb7o 2lcm* :pa fxqau1z5i m,s,ation 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 surfp9l d.)eetmw1ace of planet X where the accele .19ml)d etpweration 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 planet X d* 20 0x vk90c)3gwzaujnqrcq where the acceleration rvkx9njqg 2a0q0c)w*cz0u 3ddue 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(*uazml l:bbmb:xbtp ) *ue +p-bj1t2 . If your friend holds a ruler between you*1bxpbmuu+*: t2 jmz -al bp:t()blebr fingers 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 of 19.6 m/s. What is its velocity afterxd yq zdvt6so .*wb0.p x).9fn 3.00 sw oq* fxdz.69txb y)0v.pdsn.?

  A bullet shot straight up returns lit; 2 lez1)i7a)svl eto its starting point in 6 s. What is the initiav);zi2l1) t lsil e7eal speed of the bullet?

  A ball is thrown straight upfg+;z :2uqgx)g nuz 6. siji9l with a speed of 36.0 m/s. How long does it take to return to its starting poingf+iul):n;gzs6g2 i q9.jxuzt?

  A ball is thrown downward from the top of a building with k51e/ 5r9 bh3yupdaic osg6/ can initial speed of 21 m/s. It strikes the ground after 3.7 s. How high is the bce5gduih kr/1 /3boay659pcsuilding?

  A ball is thrown straight up with a speed of 30 m/s e+a6t/lw 89f vic*qud. (only fill in numerical value in the blanks via9 u+e*lf/d8ct6qw )
(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 g 8dd swrdq n))2x8u(uj enj71into the air with a speed of 32.9 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 3 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 wa;8ouov)y o8e o)(v3pm ;* vl8xj svivelocity at t = 1.0 s?

  In Fig. below, what is the ,en3 t-,.ojvcu/y 5o ls+ tvnivelocity at t = 2.5 s?

  In Fig. below, what is the velocit-mac3deu h *l0y at t = 4.0 s?

  In Fig. below, what is the velo76e3m8jh1 jlci.8no a-vz n tycity at t = 5.5 s?

  In Fig. below, what is the average velocity 3/iz dj33z)k88q nxgf zhum (dfrom 0 to 4.0 s?

  In Fig. below, what is the a9idtq;(j nk3jverage velocity from 0 to 6.0 s?

  In Fig. below, what is the a5-sci1 yu, y )*d/sii+sa gkbbcceleration at 1.0 s?

  In Fig. below, what is the acceleration at 3.0 sh02t7:o cezucut-y wdj70 8 ue?

  In Fig. below, what is the average acceleration from6vdqk+ : k)lhbly6l0z 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.0 s?u fbk s,,da r*soo/(i4

  In Fig. below, what is the displacement from 0 to 8.0 swu 3uu 9aeh90* x23)rr6v lkaarok) tup05qtx?

Does a car speedometer measure speed, velocity? {speed|velo4aue1 /loyj7k city}

  An object can have a varying speed if its velocity is ucz0o 1zq:/4mgsdud7u :rr9dvsxq -i) ug .5z constant.

  The velocity of an object can be negative when its accel 2tutxpxz2a 6;eration is positive.

  If one object has a greater speed than a second object, the first mus g5(/nis (cjgeso-) ;jwkk.det have a greater acced cneo-k( jk5s;gg(/j.iw)esleration.

  Two cars emerge side by side from a tunef36iz+p9a y w8e5.x6 bqpdubnel. 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 in1f2 n9gh 46iz hqz)o6ln .scyrbs/nt3 speed as its acceleration decreases.

  A baseball player hits a foul )8odey1tdi xn d5 hp2(ball straight up into the air. It leaves the bat with a speep d51)y x d8dhto2e(ind 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 d9d3e*7 p:rf2 csoi evacceleration, how does it change if airf :vedi3pec 2*dors7 9 friction is ignored?

  As a freely falling object speeds up, what is happening to its accelera*b6gasw:lot, 9;v wc stion, how doesa;96ts:,v * l obswwcg it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return te (5i*g;t3a n)f:( byzr yvn4 hbef2ymo its original position with the same speed as it had initite)mn5r*b hz3f a e(;gy:4y 2fvy(bi nally if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero s)m/15bniun bc*ha:6 ejti++ 7pw lkdacceleration at the same time.

  An object can have nonzero velocity and zero acceleratim6 tcoalyq6/l3 : x jpwn2ay,(on at the same time.

  An elevator moving from the second floor to t 5m aj80yb*g451domkbgbdwz+he fifth floor making no stops along the way has zero acceleration all the timbmy551b 8mzgajd*o+ 0b4dgw ke.

  A rolling ball moves fro/ gzkl3+9wfo bm $x_1=3.4 \mathrm{~cm}$ to $x_2=-5.0 \mathrm{~cm}$ during the time from $t_1=1.3 \mathrm{~s}$ to $t_2=6.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.4 \mathrm{~s}$ is at $x_1=3.4 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete l2xt9 +-jaya2ub9ah x naps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.7 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 straightpc9tu kms;-odr .wnn1 ee*6s22g) zy a line, moving 105 m away in 8.8 s. It then turns 9;up n sza1ky-*s26)wgocn2tm.e d reabruptly and gallops 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 froue ufj*,vzs e3 ,uv3f+m $12 \; m/s$ to $23 \; m/s$ in 4.2 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 )u7 bqyl(m n;rsi2 ja+rw 9h72qpc/qr$22 \; m/s$ to rest in a distance of 63 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spa .9kbrnngzb*(0hf6 jgjh+; 1 hgzw f)eed of $32 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.2 \; m/s^2$ ?  (数值)  $m$

  A world-class sprint62ln)j/6pmmube a 3tu:dp d l*er can burst out of the blocks to essentially top speed abouj : 6p/ltd uu*32pml)banedm6 t $11.0 \; m/s$ in the first 11.2 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 speed34 gcv ocy+4px of $19 \; m/s$ to rest in 5.94 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid --v:o e7kgt ;b1xm ybmmarks 92 m long on the highway. Assuming a decelerat;xtg7m:b 1 --ve mkobyion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck:gh)b8/ zh fin()bmuw9 ptu v+ 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,e4uxl ixf een48/xxa,a.o23d000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must a8e i,4 4 f3/ulxexnxaexo.d 2then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$