Suppose that an object travels fromy8l3 duse8hh m9 n 8,9znhv1cy one point in space to another. Make a comparison between the displacementnlc u 9z8sd,yehyn93 h8m81vh and the distance traveled.

  When is the average velocity of an object equal to the*cse2a/jjn0de 8r:l,vdobmt(t. ; b n instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to six73j h)7iwt;e(yt v deaty in 8 s". This is a deseiv(ay3t;jewt)d h77cription of

  An object moving in the +x axis experiences an acceleratil ijud*g5 *db*on of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow h3tvz6b79 msmdown as it approaches a traffic light. Make a statement concerning its accelerat9zmb vth 3ms76ion.

  Suppose that a car travez8+cb- )gz,y fow qjy7ling to the West (-x direction) begins to slow down as it approaches a traffic lig)y-owcqb+zf g8, 7zjyht. Make a statement concerning its acceleration.

  Suppose that an object is moving withz: ys(u6b935.ek;m-qymx6 ge f vpyys a constant velocity. Make a statement concerning its acceleratif smby 6;( uv-sy.6 m9:5eypeqg yk3xzon.

  If the velocity of an object is zeh8tx+wv 2-p ewbdg1 2vro, does it mean that the acceleration is zero? eg 2xbwh1p8w2 d-v+ tvSupport your answer with an example.

  Can an object's velocity change direction when its acceleration is constantyzoh17.poybx0+ dj0 z ? Support yobjo0h+p1 xoz.y7dy 0zur answer with an example.

  Suppose that an object is moving with constant acc g p28/9erkrafqgl;l0 eleration. Make a statement concerning its motion with ref9g8 e;k/ g2ql0lprar spect to time.

  Can an object have increasing speed while its,kpxg ; oph.+)xxs 5tg acceleration is decreasing? Support your ansg 5hx+,ok; xxg.ps)p twer with an example.

  Suppose a can, after an initial k) ic,+p62b7gmr zarthick, moves up along a smooth hill of ice. Make,a) zrc mtb2rp h+7gi6 a statement concerning its acceleration.

  Under what condition is average velocity eq l yxzy1-/lg6vual to the average of the object's inxlyvg-/1 6zly itial and final velocity?

  Objects A and B both start at rest. They both accelerate at the ubz.)lb 6yay8 tts8th*) .yc ysame rate. However, object A accelerates for twice the time as object yy lst*hz b8y.tcbu68y).)a tB. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the .c n mwxc;pg( )p8irl2miay+,same rate. However, object A accelerates for twice the timer8);2 n yiic a,mpg p.w+mxl(c as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released f d/wtvit/oh/a x f8(9qrom rest and falls in the absence of friction, which of the following is true conc di/ (hw8/tq/vao9f txerning its motion?

  When an object is released from rest and falb483u xnoa6ink(am r+ ls in the absence of friction, which of the followi4iuok3a(m+nnx8 6abr ng is true concerning its motion?

  Suppose a ball is thrown straight up. Make a +; zshwja/t /i*hive1 statement about the velocity and the acceleration when the ball rew;/ shi 1* hize+j/tvaaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration ju2ptxt,qn v2c y;b.6ce st before it reaches its h .pq, xtn2tb6cc2ey;vighest point?

  Suppose a ball is thrown straight up, reaches a maximum).s)b8 f/ iu ndgaac6h1l4uxi height, then falls to its initial height. Make a statement about the direction of the velocit).a 6 u 4sx8/)1abiindlcuhfgy and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls 78smm ziqiwt96;9hvy7 g8 u ujto its initial height. Make a statement about the direction of the velocit gizmv9wu8t7 hq86u9sjy ;7 imy and acceleration as the ball is coming down.

  Suppose a ball is throo.kyyo rdd;,h+ y3y-ewn downward in the absence of air resistance. Make a statement concerning its acceleration.ey.,h 3oyk;rd+yy d-o

  Suppose a skydiver jumps from a high-flying plane. What is her accelerat7+dp8hjyyhf- 6/v f801cxw ji xsze9nion when she shi0y8xz89hfn v w-e7+/ pj 1ch jfsxyd6e reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second ball is6l hj,zp q0w4f9mrg6e.kv bp;c2-r wr thrown upward with a speed 2v (twice as fast). What is the ratio he;-vrf wp9,b4c r . mj20lqpr6g z6wkof 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 topt5yyb p3yr1 *i of a building. One second later, ball B is dropped from the3iryp 5*yt by1 same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. k9zxk 0/4vzt -:zjkio15jog yOne second later, ball B is dropped from the same building. As timg kzjxv/koo:1-0i54jk z tyz9e progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, and tl6/mr6tz um:3k,1en qk 4y lauhe other is thrown down, both with the same initial speed. What are thqln3r,mt4 :k1u6/klya m6u ez eir speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick ibhhl2a9- ,dj diaxmohyf6 fa67v 1.2c s thrown straight down from the same building. They are released byha-jih6hl.a1vf9o7c ,d 6 xdm2f2aat the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The j *zcjz6mpj;* position v *;*c6zmjp jzjersus time graph of this object is

  An object is moving with constant non-zep4.csm h.kce1fej4oimbyd o ;zc3:7 : ro acceleration in the +x axis. The position versus time graph of this object isymjkc 44dc :fe3s.oh;:o 17bzeip.cm

  An object is moving with fux hob809wl9constant non-zero velocity in the +x axis. The velocity versus time graph of thi9f09l oubh8w xs object is

  An object is moving with constant non-zero accelpugt9i4wm1m mk vfl/h3.b7) heration in the +x axis. The velocity versus time vm/hi um174lfp.gtb9 3khw)mgraph of this object is

  The slope of a position vers n 32kg6i(kmujus time graph gives

  The slope of a velocity versus time graph dw b8n+ef)3x kgives

  The area under a curve wl4 5 fqcjl9aw9vtb5xy4 zy : 6kzo2j)in an acceleration versus time graph gives

  The area under a curve in a velocity versus time dwqygc7 +kh8 (graph gives

  If the position versus time graph of an object is a horizontal l hgsmfgf2sz ;p4t n1-sxd;8/eine, the object itd;g4s/mffs2 8h;gx zns pe-1 s

  If the position versus time graph of an object is a vertical lin+rw b jy.oq(*wpnt34.eerh i 0e, the object isp*ryo3n+b hqwi et 0(4 rjew..

  If the velocity versus ti5k ty (71aqf1-ft xh.brth(qyme graph of an object is a horizontal line, the object istyqx5 (y17 .-h(hrfqkaf tt1b

  If the velocity versus time graph of an object is a straight line mak1 z3/ara *vfghy3cuq4i iym2*ing an angle of 30 degrees with the time axis, the obje/ 231y* 4vmyfzicqhir 3u ag*act is

  An object moves 15.0 m north and aph9l(4k9sn ,m( ctz vthen 11.0 m south. Find both the distance traveled and the magnitudea(4p9 l (,hz ks9tcnmv of the displacement vector.

  A boat can move at 30 km/h in3 sanj zg(bfse8(2r3q still water. How long will it take to move 12 km upstream in a river flowing 6.0 km/h? ez(ss(3a3 8frgn 2bjq

  55 mi/h is how many m/s? (1 mit/lq s*vab w.w +i-rm5 = 1609 m)

  What must be your average speed in ordonji8z dun0ik219;m- t brjb 0er to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours andagefe 1 v3f xz70zu2 aj:3ld6b 57 min. What is the avgb 3:3dz7a j2vlexzea10 f 6uferage speed of the runner in m/s?

  A car travels 90 km/h. How long does ith1: aynmm*u0b r( 1u;nvs6ofp . 3orvt take for it to travel 400 km?

  A ly (light year) is the distancxl:i ;ue)6 osy af/v1ro/qyz1e that light travels in one year. The speed of light iso)6/zv1 qfsy e rx/la;io1y:u $3.00 \times 10^8 \; m/s$. 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 j)px- ncmkpy (;oev spg+p bndafbu,;k) -) +;you look to the side for 4.0 s, how far do you travel during thi;j v)s+bg-ma p;ek ) )-ndp; ,y bopn(kfxcp+us inattentive period?

  If you run a complete loop around an outdoor track (40au;qncw; r4n;0 m), in 100 s, your average ;r4w;unq; na cvelocity is

  A polar bear starts at the North Pole. It travels 1.0 km south,*4n v7aw5 gncv then 1.0 km east, then 1.07 vn* 5gcw4van 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 No hvptmw;k0s voc8c416ofcr,l .1gnq: rth Pole. It 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 formt8g,k;14hc1p0o cv :.6s lcqvwnaverage velocity?

  You are driving home on a weekend frt-z7cjg z:u2rkz2d3w om school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?djukc 23rgt:z7- w2zz

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h.zn w)qvouxp 4di81t :, What is the average speed of the motorist for thi): dupxqwi o4,18tvzn s trip?

  A motorist travels for 3.0 h at 80u/z;)2k vdd fr)ep3uq km/h and 2.0 h at 100 km/h. What is her average sp3fkuz;)equ) / pvddr2 eed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h an,l fr 97 gzshr/iyr*1qd then at 250 mi/h north for 750 miles. What is the average speed for the trif 7,iqylg s9r hr*1r/zp?

  In a 400-m relay race the a.0f8k ovmzxrt 4gcz 76nchorman (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 lead the team B runner can have when the team A runnz7r80ocv f6t .4 zkxgmer starts the final leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a stop after 12 s. The car's a/92bvs,p o k68zs1krumgh s8ogkj3ag:(o:j fverage velocity during deceleration was 54 km/h. What was the car's decelerationp:zk2has 3jggs8 :bkoo 8mfs 9/kr1 6(gju,vo while slowing down?

  An airplane increases i376cd q0f+6zt1ri uo z jdc9skts speed from 100 m/s to 160 m/s, at the average rate of 1zfdu r36c0zqikd9 o6scjt +7 $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 khzx52f +ex*bl m/h 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 accelhl9s yhc*70glerates 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 spr un53. foui 3guf83mnfzmbng *ft07 9eeds up with a constant acceleration of37t * 8fz39g 5u ubnf3fmion rg0mnuf. $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 6.2 m/s experiences a constant acceleration o gwg 9u0z6qoy(6/ljqm 606wol9gju qzgm y/(qf $4.3 \; m/s^2$. What is the cart's displacement during the first 7.0 s of its motion?

  A bullet moving horizontally to the right ( nlb;/*.1 qkyipl2,kzmmjpbj nv+z9:+x direction) with a speed of 481 m/s strikes a sandbag and penetrates a 9nbmm .zy1 nl+k, q;pjzli* p:2jv bk/distance of 95.96 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an fj4qnm 9/ eyz6*5ieqt9/nwuuaircraft carrier. It reaches a speed of 42 m/s at thee n9uuj4t yq5eq/f */6nwizm9 end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constantks7 rw br .ndomke.;di4g 2/b+ 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/sbblrmk- fqa 7./+ldxlymss(+pl59 4h in a distance of 200 m. What is its average acceleratl sdxba5-4pms/l79l f +(qlry+mbh.k ion?

  An object starts from rest and undergoes uniform acce a/v(rw.(a tsjleration. During the first second it t t(a/svrawj(.ravels 4.6 m. How far will it travel during the third second?

  An object is moving inuus ns.2m y(,(j*9 qj yo6uskn a straight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds y sq(6umn.9 o s2uykuj,s(*j nlater it is traveling at 10 m/s. How far does it move during this time?

  A car starts from resm uqn cb9p-lc4p( m+7:3 neoyat 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 a dr.en6a7we9xjsdo l 4cfg(i1(t y 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 e)+4mnej d xjbf/cqn: n0e b:(car that has been waiting at the intersection starts ahead with a constant accelern:e cdnxb0/e)b:+mefjnqj (4 ation 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 thev0k h 5e:s2txtm+k,jw surface of planet X where the acceleration due to g5tvwx +jtshk m:k0,2e ravity 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 onp vpum 3: ti,+y98wvet the surface of planet X where the acceleration due to gravity is ,ytv p3e89i:twmvpu+ $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upward with a speed of 15 md4)b)e dvdo;q:;gh -prm-goi /s on the surface of planet X where the acceleration due to gra-rom ;;4)ghe)dg-o di v :qbdpvity 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 ;vd))oe+klkn sr;fzjw 6*7 sf*vjty6on the surface of planet X where the;fk* vosj)dj wr+nel66vz;7 k*ts) yf 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. , ve80g j fnvkqrmp/ (s(g. ;l;pjsc;q If your friend holds a ruler between your fing;(pjc v.gqq;gs/ mv(k,0jer;nsl p8f ers 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. Whas;(6e/x2on71 mqcpab5s :iqs lh a, at t6jq(ft is its velocity after 3.00 no 7ts (scf q x (,a:h6epaba2l6t mij/15;qqss?

  A bullet shot straight up returns to 7j z/n4 5y lpc5ugyn; p3ebq7eits starting point in 15 s. What is the initial speed of the7y 5u75 zjpgpbq3 ncley4/; ne bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. 24)*iydxk1b4hyp *xnd7qx xf How long does it take to return to its starting poinx xn7pfy*xq2ib *d14k4yh xd)t?

  A ball is thrown downward from the top of yx1k1z+gyy -va building with an initial speed of 26 m/s. It strikes the ground after 3.1vyxg1z+k-yy 1 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. rf-27wod1 dn8iu c73 gl k,rpn(only fill in numerical value in the blanks) f7w1nrn8kr2d3ucgli ,pd 7 -o
(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 im38oz nwz *)k6yly )synto the air with a speed of 21.5 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 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 00x v1;*adpogx7o yu0 r;qgh u= 1.0 s?

  In Fig. below, what is the velocirh9 neugk7:r5 :h8 b3:t:y mk imvr+apty at t = 2.5 s?

  In Fig. below, what is the velocity a2 .qzzr-e bg;it t = 4.0 s?

  In Fig. below, what is the velocity a)0xlbsbik. l +t t = 5.5 s?

  In Fig. below, what is the ak7p4 8vo lm2javerage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 (224hz yphoi;wl u+4b/t grxhto 6.0 s?

  In Fig. below, what is thdn1 ):7gxpqrocc).r n e acceleration at 1.0 s?

  In Fig. below, what is t8ut2e; qn*f3kijqu :uul5a* mhe acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 c bps7u kaq ,6 khr17f:dn0mlq.i*c b7to 5.0 s?

  In Fig. below, what is the average accelerationvgbd2wjs-8 n: vrg:l1 from 0 to 8.0 s?

  In Fig. below, what is the displacement f.eti- g+gj*bzyn d,w ,rom 0 to 8.0 s?

Does a car speedometer measure sp0t ot3 l/ute;,yy2tjj.au am,eed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is constaysgw2.v6s fv1 nt.

  The velocity of an object can be negative when its accelix -o(i1pnm j9a sr)*ueration is positive.

  If one object has a greater speed than a second object, the first must h 77v+q kq 4xfe-eavh+nave a greater ae4fq7+ke7x -+hanv qvcceleration.

  Two cars emerge side by side from a tunnel. Car A is trav0 nqml5hz8 2ydk) c(du 7rc*lleling 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 a*tg0 a9jwc)dr3c,g- xwzy u9 jcceleration decreases.

  A baseball player hits a foul ball straig/dmoyw agg 6:o+q7ri v;/sqvr) eb*,nht up into the air. It leaves the bat wit bv:)wqdreo6 /q ;*7n g/,gyvormi+ash 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 happening to its acceleration, hohd/x , tkbf88cqmox+* w does it change /+qmth b8k,*oxfdc 8 xif air friction is ignored?

  As a freely falling object speeds up, what zc-/z 8ej 7+j;xdz uzhis happening to its acceleration, how does it change if air friction CAc+; zzjhjz7 u-/e zxd8N NOT be ignored?

  An object that is thrown vertically upward will return to its original /s4c,1.lfzbd gwc d. fposition with the same . cg lbfwzf ,c1/d.s4dspeed as 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 nonzero accel5v k7bpac,d +0 nyjui0qwv )5ueration at the same time.

  An object can have nonzero velocity and zer 9vr3l,fh3nt io acceleration at the same time.

  An elevator moving from the second floor to the fifth floor kmo8x:at +c,se fp0(z8em0vt making no stops along the way has zero acceleration alltt(m:pv e+o,k0e8 az 0m scfx8 the time.

  A rolling ball moves fr*h,uat +b-7:3mcys 5 az5hyl2gld rkqom $x_1=3.4 \mathrm{~cm}$ to $x_2=-5.4 \mathrm{~cm}$ during the time from $t_1=1.7 \mathrm{~s}$ to $t_2=5.3 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.2 \mathrm{~s}$ is at $x_1=2.7 \mathrm{~cm}$ and at $t_2=4.0 \mathrm{~s}$ is at $x_2=7.9 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight come y5i3dd mndbo38+p-is5m am)plete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.9 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, moving 92 m awatr 6 -,itok7,u/,x rq3fnjkr zy in 12.0 s. It then turns abruptly and gallops halfway back in 4.5 s. Calculate (a) its aver ot,r n7uiq6k/ -xr3k ,,zfjtrage 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 fro8(6 qzu p);mivh9sfj ja fj5d1u,1lanm $11 \; m/s$ to $23 \; m/s$ in 5.3 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 fromqeg zp/5;frb 2 $16 \; m/s$ to rest in a distance of 79 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a ipk3/;rtmg+dc8fgq 8speed of $25 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.2 \; m/s^2$ ?  (数值)  $m$

  A world-class sprintertx.):qr +p 4v+a.q*uo c ysgzh can burst out of the blocks to essentially top speed abouc *.hz4oag +t: p)rquvx. +syqt $10.5 \; m/s$ in the first 13.2 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 frb)6:yx pntm84adwu ah :v* gd2om a speed of $17 \; m/s$ to rest in 4.07 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m long on the v5mp2qi)fm1f e5k .yv8nbs .qhighway. Assuming a decelk25p1q.mmq) fyes8. fv vnb i5eration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going wsl u9hi6uty7e9uk4: $25 \; m/s$ on the highway. The car’s driver looks for an opportunity to pass, guessing that his car can accelerate at $1.0 \; m/s^2$. He gauges that he has to cover the 20-m length of the truck, plus 10 m clear room at the rear of the truck and 10 m more at the front of it. In the oncoming lane, he sees a car approaching, probably also traveling at $25 \; m/s$. What is the closest distance of the approaching car that he can still sately make the attempt to pass the truck? (without hitting the approaching car).    $m$

  A runner hopes to complete the 10,000-m run in less than x(5k*eutfto.wd4y7 q d (zhw )30.0 min. After exactly 27.0 min, there are still 1100 m to goy*(t( .dftzk)7oweu45xwh dq . The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$