Suppose that an object travels from one pointk fv ns4xy,-;,fw wfv6 in space to another. Make a comparison between the displacement and the distance s; -vw4n y,,f6wfkfxvtraveled.

  When is the average velocity of an object equali9 1vtre xzt ,.jqa59 )mn5tom to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to six smf )s,qrhos8w:/r 7bty in 8 s". This is a87w/) mbssho:,s rqrf description of

  An object moving in the +x axis experiencefs,: ldyeuba- m4/:ztq+1m:b.ocs5 ks:imrts an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) bed-j8;syum/.i74ny grjr bjnu u, eh7 .gins to slow down as it approaches a traffic light. Make a statement concerningy rs.gj8u b7hn -jr,n; mjuiy.u47e/d its acceleration.

  Suppose that a car tr50;bsk( h tlmp( :p7wcwk4hz qaveling to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statemenzc sql(b4hkww: 7k p5 0p(m;htt concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Matj7vs szkts4ww g*7ff)q kh 65s/ma37 ke a statement conczs7v gsq*tk57)a6m7w/ffjs 3hw4tk serning its acceleration.

  If the velocity of an object is zero, does4jn 3 g4,mmtca it mean that the acceleration is zero? Support your answer with a tg3mc4anmj, 4n example.

  Can an object's velocity change direction when its bvtl z590o(a9nq1 uc iacceleration is constant? Support your answer0 9uaibqzt n1(lvc95 o with an example.

  Suppose that an object is moving with constant acceler 7qpn,3hg;wopjh g- o.q.m0rration. Make a statement concerning its motion with respqo.7j rw;30gno,m-.rh pqgph ect to time.

  Can an object have increasing speed while its acceleration is d: nw,x65,ytrw mmdu j8ecreasing? Support your answer with an exx8r6 ww5t:,nj mym,duample.

  Suppose a can, after an initial kick, moves up along a 8k 1dlb k1o ocy-:u;psh4mm.f smooth hill of ice. Make a statement concernin8s 4lyh1m- p d1 kcomf;u.ob:kg its acceleration.

  Under what condition is average velocity equal to the average of the object'::/5m rt8vz j, r, 55qwxu:)eztdtc1 jnxopwks initial and final velocit,,jd q nwxkrve5o x)1zmp 5/ jr:z:ttu:t85wcy?

  Objects A and B both stvb bdrc.yz ,s *ek(/9wr r21jnart at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. W1w(v*,bk zj9 2e rr/yn rd.cbshat is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They dz cfp1lyc v8g 6d/e2(both accelerate at the same rate. However, obje/f lz61cepd (vd y2c8gct A accelerates for twice 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 absence of frtbk7gpr 5 8.db,hx-r etf7b4 yiction, which of the followipy-xbhkrt,d 5 b7.f 4etgr78bng is true concerning its motion?

  When an object is released from rest and falls in the asuiri+/ew0mti1y2egkn/f.7 j/w n 0 zbsence of friction, which of +gm/ifi0k yuwe i0 . /71ze nr/2wjtnsthe following is true concerning its motion?

  Suppose a ball is thrown stnp xm(/qewmash 5by+ek +:o)9raight up. Make a statement about the velocity and the accelera ea+oyp k/ns: m)+w qmeb95(xhtion when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acc kkeacz0cg 6a-l3o9c:t .dez/ eleration just before it reaches its a9ek60gc ct:zce3z .lkoda/ -highest point?

  Suppose a ball is thrown strk ohm(; b.yx(daight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction ox(oymdhk b; .(f the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then fall 36ewj x7nac *qbw;f3ls to its initial height. Make a statement about the direction of the n7e6acwbw3*xl f q3j ;velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward 4o, w k5i oc.mmdh*x-min the absence of air resistance. Make a state*o,hm.mmk5o 4dxwc -iment concerning its acceleration.

  Suppose a skydiver jumpsp5ux:otm z a;2 564n brotao8z4tdmy6 from a high-flying plane. What is her acceleration when she she x66844mpuda5mnz; 5toy o 2tatb rz:oreaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical sejmag6) 2k rskcyr ;9s t7)/jmqcond ball is th)9srk) kmyqcr7amg 6 jj; 2ts/rown 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 second ball go than the first ball?)

  Ball A is dropped fromdt4vgqak v ;o9; +nk 40a7eyzs the top of a building. One second later, ball B is dropped from the dz9o0 4kny;vvk7+4t s g;aeaqsame building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, bao)5;m rqna27 dtxg-uvll B is dropped f-vaot7 5 );rgquxn2dmrom the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. 3 wc/(gci- n cshvb./wOne is thrown up, and the other is thrown down, both with the sacvbhcswc/.g /n3(- iwme initial speed. What are their speeds when they hit the street?

  A brick is dropped fromlob(pcou;pkp / r *j2gs7)0iq the top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Negl gbko*rs/l 0pciuo);jpp7q(2 ect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero veloci v76zrmwbw2r9veu ;5cty in the +x axis. The position versus v5 72e6 brcwu m;z9rvwtime graph of this object is

  An object is moving with constah i:3qe mqmh(2nt non-zero acceleration in the +x axis. The position versus time grap3:m hemiq(qh2 h of this object is

  An object is moving with constai483mo glq;b qdk 7-cw*u0xwqnt non-zero velocity in the +x axis. The velocity versus time graph of this object mo3dw48cgb qx*wqkl ;iq7 0u-is

  An object is moving with constant non-zero acceleration in the +x axis. s4* ybrf)ojg4 The velsjg4) fro4by*ocity versus time graph of this object is

  The slope of a positik/z i.xdi)p )con versus time graph gives

  The slope of a velocity 03ia5 eqiyd8qms7.o3gye0 t aversus time graph gives

  The area under a curve izcx6)g a gefu w433.sfic;.u ln an acceleration versus time graph gives

  The area under a curve in a veloc4xj)7 )gd bf3f)ssi/ak ir* usity versus time graph gives

  If the position versq k,h2xmg64v.wq 4bcbus time graph of an object is a horizontal line, the object g bqxmh. 4v4 qwk2c,b6is

  If the position versus time graph of an objejht+;c fn+9i t-txkd;ct is a vertical line, the object ist+ fk+t;; cdt9nh x-ji

  If the velocity versus time gp8d: y0:m;r*4sqv 9bugz/pqojggl o,raph of an object is a horizontal line, the object bg*0rqyzoum sjv;: q do: g9,l8p/p4gis

  If the velocity versus time graph of an object is a;f.e 0m7o*jaieuhby(2 e3 kmd straight line making an angle of 30 degrees with the time axis, teh.(omk iumye b3*e0 j7dfa;2he object is

  An object moves 15.0 m north and then 11.0 m south. Find both thg84k zt ax+3 qe8d;kzhe distance traveled and the magnitude of the displacement ve h 8 zkq3zgkxd+e4t8;actor.

  A boat can move at 30 km/h in s i.:o c9aczudjlo (;y8till water. How long will it take to move 12 km upstream in a riverzid c lo;:(ayc.jo89u flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi7jz u4q:feu/q = 1609 m)

  What must be your average speed in order to travel 3lm(i dj r3tn,( gkzx,)48 fdqk50 km in 5.15 h?

  A runner ran the marathon (approximaj0i;sz,9 ;zrnhdi * zztely 42.0 km) in 2 hours and 57 min. What is the average speed zizh9sz ,i 0r;d;z n*jof the runner in m/s?

  A car travels 90 km/h. How long does it take for iuvi+ ( w,w hitkn z;8sjat3,3ft to travel 400 km?

  A ly (light year) is thjx5c+qf x6 yki3m32gfp3gj-t e distance that light travels in one year. The speed of light is5ifj3c-tk 6x qf 23m+gpyg j3x $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

  If you are driving 72 km/h al : )mum;vqqbf*ong a straight road and you look to the side for 4.0 s, how far do you travel during this inattentive perio bquv*fm):;mqd?

  If you run a complete loop around an outdoor track (40q7d7rizhedl1dix7 at7 d/ s* )q8jlm50 m), in 100 s, your average vel781z d )jl d 7xi7mr/he*diasdq57qtlocity is

  A polar bear starts at the North Pole. It travels 1.0 km southi,yi0 g:dui8 e, then 1.0 km east, then 1.0 km north, then 1.0 km w,u 0egi8di i:yest 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 travels 1.0 km south, then 1p3du0(gn w3a .97bk-f tewhyh.0 km east, then 1.0 km north, then 1.0 km west to return to its start(a3k bu 3-0ypfdw9ghhtn w7e.ing point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles.v/ ce7ocfclxlj .;3 n( It then starts to snow and you slow to 35 mi/h. You arrivlfc/eljx ;.7 (onvc3ce 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. ym iacc; wuhuwa-*pxr 2w//.0 What is the average speed of the motorist for tu c;ww2mxa -yw/*0.puh/raichis trip?

  A motorist travels for 3.0 h at 80 km/h and-pny cbmsrt;xd1 :hq f *,0,fe 2.0 h at 100 km/h. What is her average speed r*,t x ,hff1d se;b-0yc:qnpm for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at .oo+7fb8 p9 caqxoo6y 250 mi/h north for 750 miles. What is the aox yq.o9o+ac8 o7fpb 6verage speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the las2 /4l34*mryxbnp,8lnxaxtp3o zxq/ c t 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m in 10.1 s. What is the largest lead the team B runnery xx, p8 34llzb3 cxnt4orq*/ ap/mn2x 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 11 s. The car'su9wogo/qhptqmqs:38 s( i :(x average velocity during deceleration was 59 km/h. What was the car's deceleration while sloww3gxt8p (( 9:qqois/qoumsh :ing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at tng,drl +q9 5i je h7x(si*w as7vk.fj5he average rate of (sqrgk d5j*wlhs+97e i5 .i7xanfv,j$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acce17s vi3a r0f6x z,qcbplerates 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 acc flqov0(bwf b9be14:kelerates 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 n/-y5mjofq5n(puc yei 0dt36 up with a constant acceleratiom0f p6enntq5i/u3c yy5oj (- dn 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 5.7 m/s experiences a constant acce,,ir mrl6x;s lleration of ,lml ,sxirr;6$2.0 \; m/s^2$. What is the cart's displacement during the first 8.5 s of its motion?

  A bullet moving horizontally to th3 pl6,.k8n0/gt)b ormf5zppfy z+f bmn;yhl8 e right (+x direction) with a speed of 221 m/s strikes a sandbag and penetrates a p+gbzy)h k n. 80t lf;z6n/yr3p op,m8flbf 5mdistance of 79.63 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched frk1e qwq,v v g.z-,1tdvom 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. Assumin v,.dkzqvtgev,-1 wq1g the acceleration is constant, what is the length of the catapult?

  A car starting from rest rg1w e-v 6tjo*+3iopgmoves 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. W: eyohg*r nd :*yg:5rvhat is its average acceley: dor 5hy:n*re*v:ggration?

  An object starts from rest and u3,8dycn1:jl si knw/cndergoes uniform acceleration. During the first second it travelc/n wcndlky 8,3:s1ijs 8.0 m. How far will it travel during the third second?

  An object is moving in a straight line with constant acceleration.m) so4enrfgd7x 2czr9 j.q q10 Initially it is traveling at 16 m/s. Three seconds later it is traveling at 1 zm9ro1n2x .d40q7qres )fgcj0 m/s. How far does it move during this time?

  A car starts from resher x; x67 ata4uiw,9wt 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 on1.m2(ecmai sk a 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 turns green, a car that has been waitiu*h;:a( kyv66nodt o 32wsmwang at the intersection starts ahead with a conwa na(6 2 *kh3 w;osou6yd:mvtstant 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 k6,/n3trk9fwxc r 1yrplanet X where the acceleration due to gf 9/r1k x3ky,wr rnt6cravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upwapmcp,+ggw/ a 74zy6e ard with a speed of 12 m/s on the surface of planet X wher6,pp gya4+/wz7cgem ae the acceleration 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 4 9; bk-dx3xsi /,bzn e zmu9y+:srodron the surface of planet X where the acceleration due to gravity i ,e zumixd9-szr3b kd :y4b;9+onx r/ss $2.5 \; m/s^2$. 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 plane9 /;izcbh7eu lt X wherec 7eu/b9; ihlz the 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 friend holdsfrf5arksz .54t v)bp()e 6ob v a ruler between your fingers and releases it without warning, how far can yourfzvr65f vbes)bo 4a 5k. ()pt expect the ruler to fall before you catch it?

  A ball is thrown upward at a vel6 s:rq86xldzcocity of 19.6 m/s. What is its velocity after 3lcxz8:d 6s 6qr.00 s?

  A bullet shot straight up r7n g y 8,kw,m49 ,im3aqxsbroleturns to its starting point in 9 s. What is the initialob8 sgrqmk937 ix, m4,wyln a, speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it taken 2ulb-k4lu2 b to return to its starting ponl b 2l2b4uku-int?

  A ball is thrown downward from the top of a building with au99ek z7 kp+ nr4n+jycn initial speed of 22 m/s. rj c94uknneyk+79p+z It strikes the ground after 2.2 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numdjbk o*y 7)j o5frve7uv7 /,eterical value in the blaft)u je edr7bvvj,k / o7*7yo5nks)
(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 i(5w dqq,wmngav m 63:into the air with a speed of 23.3 m/s. (use $g=10 \; m/s^2$, only fill in numerical value in the blank)
(a.) Calculate the time required for the ball to rise to its maximum height.  (数值)  $s$
(b.) Calculate the time for the ball to fall back to the height at which it was hit.  (数值)  $s$
(c.) Calculate the maximum height reached by the ball.  (数值)  $m$
(d.) Calculate the ball's speed 3 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 13 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 13.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.0 s?y,0tovuh0w)bagc z ; 0

  In Fig. below, what *sc(32-d u*gi zv dwcmis the velocity at t = 2.5 s?

  In Fig. below, what is th* 0h u/j(-x ibfwh.jzxe velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5.5 (n8tmif)opx* 1yo p3 cs?

  In Fig. below, what is the averagmd. 5jo37qjx4a+e fpoe velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 6.0 1 l06dbnipi1x2u d(aes?

  In Fig. below, what is the acceleration at 1.0 yxs5yh*o81ma s?

  In Fig. below, what is the acceleration at 3.0 mrv ag;px j67; ;rf8njt9ch+fs?

  In Fig. below, what is the average acceleration frm ,o4;vz v,q o+ki+hirom 0 to 5.0 s?

  In Fig. below, what is the average acceleratiopnrugf+ 75q6a. -8jayvkh 0 wgn from 0 to 8.0 s?

  In Fig. below, what is the displacemeq w*llda:4 0 k-6kbjiunt from 0 to 8.0 s?

Does a car speedometer measure bd, v otx4kaq6 hq;jaxoto;2.y 5x8b+speed, velocity? {speed|velocity}

  An object can have a varyingq74 ge sg.s*v0:t( cdaiyfu7 j speed if its velocity is constant.

  The velocity of an object can fzlst )f3 z95hbe negative when its acceleration is positive.

  If one object has a greater spfb u;y/mlu gi 7ly*)b6eed than a second object, the first must have a greater a; by bluigu7/l6 *my)fcceleration.

  Two cars emerge side by side from a tunnkqqmb8u g; yyece*6/k(66q co el. 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 increasi3 1p e35vnhvhcvoh;2y5f: itqng in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into j0,e(epkm; t.b93tu:yxmjx9js: e x qthe air. It leaves the bat with a sp0q. t,(99;jxxj : extbk:myep emj3useed 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, ho xg0(wrv y4 -gq6ck2nuw does it changx (cgw6y0 guk-r2n4vqe if air friction is ignored?

  As a freely falling object speeds up, what ismkwdm g(+*;yrky*u3t kmd ;jll8i1mr k7/r0a happening to its acceleration, how does it change if air frictioy m+a mtrwg*lr jr1y7(duk*k;8k;/ik mm30d ln CAN NOT be ignored?

  An object that is thrown verticall.**:r pwkhu hb0fy1z*w 0g opiy upward will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is app1f*h* *o :iw0prg0y zpbwku. hreciable, how will this result be altered?

  An object can have zero vel.tkb 1jb9+jg ulk: m: sfyuv:bw.m2u-ocity and nonzero acceleration at the same time.

  An object can have nonz9krp - ge6,zv +a7gvahero velocity and zero acceleration at the same time.

  An elevator moving from the second floor to the .srgituek7n4 2 ts+d *fifth floor making no stops along the way has zero acceleration all su2+.dg* srt7i ken4tthe time.

  A rolling ball moves from3q3bixwqwh .y8 ih2 v- $x_1=3.2 \mathrm{~cm}$ to $x_2=-5.7 \mathrm{~cm}$ during the time from $t_1=1.3 \mathrm{~s}$ 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 $t_1=-4.7 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=3.2 \mathrm{~s}$ is at $x_2=7.6 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight completeb;c/ o-zzppc 6l:er5k laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.8 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainer /re uxb:r:smo1n73ia in a straight line, moving 108 m away in 10.2 s. It then turns abruptl u:1 r/ao xsm3inr:be7y 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 vbfd wrhhl-d/,s13q;pz.- kr$11 \; m/s$ to $23 \; m/s$ in 4.3 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 5q.4fai l9vu-,ro4eqx,rv57 eh wlbx 9j rh:u$17 \; m/s$ to rest in a distance of 63 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must re5b8g4r 4hyrhq ach a speed of $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.9 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top speed euo3lki+ /-1mxx-6 dax kg6 sw( ed,mwabout1+de6mkx6a ,/ x-lwx dis(- 3kegmouw $10.9 \; m/s$ in the first 13.4 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 unifor0w ;b1 s3cfudimly from a speed of $17 \; m/s$ to rest in 5.30 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car eznj 2c (m ycrj.4wx8 9zw2sv6d60xs dleaves skid marks 92 m long on the highway. Assuming a dej8wx6xj .wmc vdz cne2z(d04rs2 6s9yceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tru5brm+:r0 kn8 z uyiw,dj) axa+ck 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 completehvq -26+ 6lt6za uq(4lrehvfn the 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then aclrhq6ht-zlv +uvq2ne 66f4a (celerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$