Suppose that an object travels from o4, dk;.rz uu f b;:oba)mwyt, h;qo1done point in space to another. Make a comparison between the di; o;1 odfbr k,h)tduuyao. mqbz;:4 w,splacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous ve ,l4c:bs:w akjmdm4n7ss 4.a kng.;fn n,.vxolocity?

  A new car manufacturer advertises that their car can go "from zero to sixrggoepa tw,oy72.q08*pq a- hty in 8 s". This is a description -hq o7r gppe2 oyagwt,.aq*08of

  An object moving in thl f.r879 ;xvxly;mlb ue +x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling w 9eof- (7qq;v pppt7zk+ewo9uw2 -cg to the East (+x direction) begins to slow down as it approaches a w-wp-7ftw 2c e 7p p u9qeo+og;9z(kvqtraffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow27nq fzz qm5v4 down as it approaches a traffic light. Make nqfm v42 z57qza statement concerning its acceleration.

  Suppose that an object is moving with a constant velocitfiptkd6xv.4 ii w/+9 yy. Make a statement concerning its acceler6/y4i9dk. fvwt+ii xpation.

  If the velocity of an oor ax-id+ c 97bkv9rd :;h:nzczv41oubject is zero, does it mean that the acceleration is zero? Support your az7c dzn hu:a-kx:o; 9 dbovr+ivr941cnswer with an example.

  Can an object's velocity change direction when its acceleration is s 0/tu0;,qif wwtaopp.m6 k3/m 6vnmy constant? Support your answerpys6ma.t60wf m ;m/,pon0qvwku /3ti with an example.

  Suppose that an object is moving with constant accelerat97/ xjt cjetz7 bcgm.(ion. Make a statement concerning its motion withme7c9bz(x . jtc7g tj/ respect to time.

  Can an object have increasing speed while its acceleration is decreasing? q.yygvb+slo+l a,i2r+ *e9kp8 to+bv Support your lp,*l s . r+2by+ vai9geooq+t bk8yv+answer with an example.

  Suppose a can, after an initira x ko5-55seaal kick, moves up along a smooth hill of ice. Make a statement concerning its accel5 k-s5oara5x eeration.

  Under what condition is average a mw;dlca8c8/d . zpl0velocity equal to the average of the object's initial and final velociamdp8l.zldc8ca ;0w / ty?

  Objects A and B both start at rest. They both accelerate at thea *rtv2cxs2- 27o.rc 7ly sgbq same rate. However, object A accelerates for twice7 tyx2c- rbgl.7v arqss22co * the time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both ac1t:y /3j widqecelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by oi y: w3e1qdj/tbject A compared to that of object B?

  When an object is released from rest and falls in the abslpk 7ar,411 cxfljk4pence of friction, which of the following is true concejkxkl a1 1fr p44,lc7prning its motion?

  When an object is released from rest and falls i/*hrv)q( v ffn ad2p3en the absence of friction, which of the following is true con h(rf npd2v3f *)vq/aecerning its motion?

  Suppose a ball is thrown straight up. Make a stuco)hu-se4sn d(,uk 0kv h2icnz+y;,atement about the velocity and the acceleration when the ball reaches the highh2u (hu4+- ,cni,0yesus ;zv )dnockkest point.

  Suppose a ball is thrown straight up. W-jtp a.yl ):+hm:mt(hnz 9qfy-yf n .phat is its acceleration just before it reaches+l-y -pzj.h hn ynp.q:9ymf)t:(ftam its highest point?

  Suppose a ball is thrown straight up, reaches a max4yzd 1fmnea4.imum height, then falls to its initial height. Make a statement about the direction of the velocity and accelerationanez41m .d y4f as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then fallaenqp 3e 5w,o)s to its initial height. Make a statement about the direction of the velocity an)5oeew3a nq p,d acceleration as the ball is coming down.

  Suppose a ball is thrown downward in t 5gmn ttnvx(vj1:5lrupb 2t1 8he absence of air resistance. Make a statement concerning its jtt1rmvn:8pb5 (5 u1 tlxvng2acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her accel vyeffqb:o)op0tu0c5, lr0a3eration when she she reaccl bv 0of t3qafe00 uryp:,5)ohes terminal velocity?

  A ball is thrown verticallyef.uz3vlk 37p upward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the ma3zvu3k.7 efpl ximum 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 building. One seo+.hoqaaxf vr+*o, p07kb u-z cond later, ball B is dropped from the same building. As time progresses, the distance between themb+- 7 ako.*vo+u0zf hprxo,aq

  Ball A is dropped from the top of a buildib-l /. zxariv*ng. One second later, ball B is dropped from the same building. As time progresses, the difference in thei i.zxvarl-/b *r speeds

  Two objects are thrown from the top5xpwus x7(ig; of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What areigs5x;w p u(7x their speeds when they hit the street?

  A brick is dropped from the top of a building. bq/2hps(nql e3daxh2 p3b 2;k1q z8ue A second brick is thrown straight down from the same building. They are released at the same tim hlq8qqp2k3e2 2aze;hxbb 1 d3n/ps(ue. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the + (zf8br1 qjlzdnwr 9n 7w.u5je+g9 io;x axis. The position versus time graph of thisfz5+ bd;9rj(r gj.uo7w 91nz inelqw 8 object is

  An object is moving with constant n *5pg9 c*jswjgqrbu9ll y*3 j-on-zero acceleration in the +x axis. The position versus rc-qjp y 59j*lj* swgulgb9*3 time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. T;bfxc kku;i 5; guj;0lhe velocity versus time graph ofxj;; 5f; bclukg;ki0u this object is

  An object is moving with -gissu 89)h ;0 a6swy0gzhe6rapaso 3constant non-zero acceleration in the +x axis. The velocity versus time graph of this object i s0 ohz;3i96pwha ua6r8- sy 0sesag)gs

  The slope of a position versus (fuv ycs7 (e 8e,uigh7 0nrlh;time graph gives

  The slope of a velocity versus time graph asdmd6ha11w43m4(j ki tz x 9qgives

  The area under a curve in an8 x9hmo)qg ikq:(8 tk6s 8kqnd acceleration versus time graph gives

  The area under a curve in a velocity versus time graph 0rz( zm-vg fm+gives

  If the position versus time graph of an objm + a:kzq--oqk12r1h.uomc, gjc0p ek ect is a horizontal line, the object i1-c gejkq k+moaq.kp ,2 o1-ch:ru 0mzs

  If the position versus time graph of an object is a vertical line, thend(ajlq8 r z5;tzr1m+ object is5nr+d1lz rqj (zt 8ma;

  If the velocity versus time grk;35c wr: p*fcwq7owtaph of an object is a horizontal line, the object otkc *rf;73pwwc:5 wqis

  If the velocity versus time graph of an object is alv 2,sml;oa2/e *)cv p:nxnb 2ze7das straight line making an angle of 30 degrees a)nlepcdmxn 2z *v/ bsv;e2o 2l:as,7 with the time axis, the object is

  An object moves 15.0 m north anamuax82mf7en*q4ga + .-hkz nd then 11.0 m south. Find both the distance traveled and the magnitude of the displn-qha mme8+af g4x2nu7.ka * zacement vector.

  A boat can move at 30 km/h in still water. How long will it take to move 1k+puk9 cwaz. 32 km upstream in a rivapz c39w+k. uker flowing 6.0 km/h?

  55 mi/h is how many m/dx u( x*8ynd.qs? (1 mi = 1609 m)

  What must be your average speed in order to travel 350 km in 5.15dy 4y7ec.:f j ghg(cll.k08ls h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 ikkrpm:u av/ 74 oj5 q9cfs()pmin. What is the average spe4pc u:7rm5( ks)a9o/fi jkqpved of the runner in m/s?

  A car travels 90 km/h. How lufb-r ewn2(k, ong does it take for it to travel 400 km?

  A ly (light year) is the distance thag4;)ng nqhu l4dma0o3t light travels in one year. The speed of light)ud40ln ;gao nqmh43 g is $3.00 \times 10^8 \; m/s$. 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 5p yrau(q ,3oornt p50u;jod/and you look to the side for 4.0 s, how far05(uoqon3, ou ;pjdp r/ y5rta do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 -(yiu .iht f/ y;nmee+l9w2iu m), in 100 s, your average velocity2inl./yti-(eu+hme9f;iyw u is

  A polar bear starts at the North Pole. It travels 1t bk /p 42h3za.i-exf/*m otah.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting pointfzph.t*/e23- i tbao/k hxam4. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the Nort atr3d0kzqtdpzq,;t1 cw 59a1 h Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 kdt,da;t1kq 1p 3ta0q5 zr9zc wm west to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend b ;,fo tpd( /kznx+1xefrom 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 sxn,k1;z+ /ped x(obftchool?

  A motorist travels 160 km at 80 km/h and 160 km uk7- ::/lxy hdt w4yplat 100 km/h. What is the average speed of the motorist for this trip: xl:yl/p4 7uyw-h dtk?

  A motorist travels for 3.0 h at 80 fif3ac11 cvy,9vf f8q km/h and 2.0 h at 100 km/h. What is her average speedv1fcfv yac318q9ff, i for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 .kd-k p-fyy- 9atfb v4mi/h north for 750 miles. What is the average speed for thev fy4-dk-k.fa-byp9t trip?

  In a 400-m relay racwh xwftc (pz5o8j q*iv2x(,o6 e the anchorman (the person who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchormanot,8zjwvhx2 wxi *c (5fop6q( 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 runner starts the final leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and 3j 1be03tyu:kqa y ac/0nqnct32y6um comes to a stop after 9 s. The car's average velocity during decnay : /30 3em6abtu10cq2q uny ykjc3teleration was 53 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average rate u*)ni- 4u/nlv 75k mawts r alj+1q-ulof tlj7auq4lu km u*v/-1 nin+a5s- )lrw$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates k3)fvuq.4 ni)opc re;/jg 9de 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 acj+4amhb: ebjzg- * 4dpcelerates 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 asfvx l 0ko5u6yck3b)5 constant acceleration of )f56l sx3y ck0kb5vuo$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 5.5 m/s experieor9b(z7wtm2vf * b, pinces a constant acceleration of f7v2(bmbt *p rzwi9o,$1.4 \; m/s^2$. What is the cart's displacement during the first 7.1 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed ofk lktdlo +95sf:lhm :y yo87o4 295 m/s strikes a sandbag and pen4okf:my8:s 5ootdh9lyll+7 k etrates a distance of 51.11 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapulm * 0t/aoeohlx j+7-y)n.fyxf t on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this rafot7)-fn +j/xhly0o*.y mx eequires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves widd q;,;pmw(;tq n c nam+-bk:jth 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/shu;l s .fr14tbsq 3q s27*eovj in a distance of 200 m. What is its average ac ;7 t ovhuseslq3 qsbf2r1.*4jceleration?

  An object starts from rest and undergoes unifot cc)1vt6 ccd0rm acceleration. During the first scct6 tv)cc0d1econd it travels 6.0 m. How far will it travel during the third second?

  An object is moving in a straight line with consta*hha**j n*4(q* l mr4. yohr qcaas-aunt acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/q a*y 4mn ohh-** ac 4jsr*aluh*a.qr(s. How far does it move during this time?

  A car starts from rest and a8*bjjx wgr s;ywl *b jtq5s z+39(crr+ccelerates 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 :ucbdn ul:z /4g78 pg (lsbur9can 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 waiting at the:ql g1oe rhsgf* ogt* 7n;l5p+c(p (ge intersection starts ahel*(p;7cg:*h5oge+( sqnrg opet lf g1ad with a constant 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 wfh4n : hd zxlaseqt57k9 +pp-6ith a speed of 12 m/s on the surface of planet X where fk7lhqdtzha:+x6e 9 4nsp5-pthe acceleration 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 surfacrb 2yx9;ekq, 49 lbdtee of planet X where the accxr,29;lq yd tkb be94eeleration 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 upwaz5kfx* b 4/jll-9gop qrd with a speed of 15 m/s on the surface of planet X where the acce 4k/ xjlq*-5zfp9ogl bleration 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 ofg9( :c tz7v;hqag3lb w 14 m/s on the surface of planet X where the acceleration ductwzql(hb7 a3 :; gv9ge 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 holds5qr6)vhdx m 3s a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch 5 sxd6hv)3rq mit?

  A ball is thrown upward at a vena;-w(if ( 83z)ko7dlccz*r dqlf m9m c a48delocity of 19.6 m/s. What is its velocity after 3.f4-idmc( 3(8;q n ld9akfare w)7d *lmc zoc8z00 s?

  A bullet shot straight up returns t 6oaaoy j(yx33o its starting point in 5 s. What is the initial sa6yx3 (o3joya peed of the bullet?

  A ball is thrown straight up with a speed0xd gv.,pp; f)s/ym5 b5qmojl of 36.0 m/s. How long does it take to retsjgm ,5; dp.omq0lp)/bfx yv5urn to its starting point?

  A ball is thrown downward from the top of a build7so ca;2m;gydgi7y x 3ing with an initial speed of 6 m/s. It strikesg;7gad3x 2y ;cm s7yoi the ground after 7.3 s. How high is the building?

  A ball is thrown straight6w9 5fpgbri)pd 7s-5cwxu l3 j up with a speed of 30 m/s. (only fill in numerical value in the blpc5 p9wfxgw sl b3r d65u)-i7janks)
(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 straezpjv 9( r)0pgopsr.)ight up into the air with a speed of 40.3 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 1 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 velocirb9 ybxn+wcdun 2 +d3x+n:gc6 +s n1u vn;gy2nty at t = 1.0 s?

  In Fig. below, what is the velocity at 1oa il;jih .s*vvw h 8 qr* /l/tv/k(vxhsu-c+t = 2.5 s?

  In Fig. below, what is 85s13qk9anjkwpdu 55ysyi- je o/b8i the velocity at t = 4.0 s?

  In Fig. below, what is the4onn:2-*o+q a+yqk7q en zmes velocity at t = 5.5 s?

  In Fig. below, what is the average velocity faup *f a h+i66oivmkv tpsw,;)*j. f+xrom 0 to 4.0 s?

  In Fig. below, what b w*cc:o ts,1p.2 ,-kybdmn ifis the average velocity from 0 to 6.0 s?

  In Fig. below, what isd b.e. 6mvxj6t the acceleration at 1.0 s?

  In Fig. below, what is the acceleration at 3.axdols 5rtj j;:o*4o -0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0 w .+0p8wip iunmb6*f rs?

  In Fig. below, what ihf++h)mq )j4 6 *upmrprswbn/o)xaa;s the average acceleration from 0 to 8.0 s?

  In Fig. below, what isqudda gw;91 y; the displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speedev2.ahjf0zbfdafn inef9/ g:- 5 a g00|velocity}

  An object can have a 7zop/y /mdh3d varying speed if its velocity is constant.

  The velocity of an object can be negative whl :fv8qsz fw2z:).fjuen its acceleration is positive.

  If one object has a greater speed than a second object, the first7aonqz yrk9 0- must have a greater accelerati 7-0oya rq9znkon.

  Two cars emerge side by side from -qp q4x u:at.cl4f;zuh*8/ wv7 xwum ga tunnel. Car A is traveling with a speed of $60 \; km/h$ and has an acceleration of $40 \; km/h/min$ Car B has a speed of $40 \; km/h$ and has an acceleration of $60 \; km/h/min$ . Can A will pass car B at the instant they come out of the tunnel.

  An object can be increasilzyye. /kve56 yef4 m 9r+p+msng in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It/kq zr5+oekd9yq7hc;,e zhg9gs :vj+ leaves the bat with a spy5k qg7oed9h ; s/ q+k,9 v:ezgc+hrjzeed 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 happeni m.1v/ytihwx0ng to its acceleration, how doem0whv1y i/. txs it change if air friction is ignored?

  As a freely falling object speeds up, what is happugeg o-j:g1kg5 a5 j)y-;obxl2uj 4z wening to its acceleration, how does it change if air fzu owuloe j2 g -agxj-k1gg4j 5:5)by;riction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its originav.gn3/l5 +7nbihlu zkl position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable+3l b5nv/ k zil.7gnuh, how will this result be altered?

  An object can have zero veloci5nnk364mk vde us8:)r vcya6v ty and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the same timebp4j xq)rfk8n g v.(a )m*;tnw.

  An elevator moving from the f6u5z(( ,m+(l1vseij3onfuuq sul 0vsecond floor to the fifth floor making no stops along the way has zero acceei,mz +nssfq((03vu l ufv5j( 1ou6 luleration all the time.

  A rolling ball moves froc 0rm7ok v xzbn6/b9;mm $x_1=2.5 \mathrm{~cm}$ to $x_2=-5.8 \mathrm{~cm}$ during the time from $t_1=2.2 \mathrm{~s}$ to $t_2=6.0 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.6 \mathrm{~s}$ is at $x_1=3.2 \mathrm{~cm}$ and at $t_2=4.4 \mathrm{~s}$ is at $x_2=8.0 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps a,8ngtz 0jzgb -+giyx .round a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.0 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 straitbmchfv70,(ls1 k)d. my f6eight line, moving 102 m away in 11.0 s. It then turns abruptly and gallh7i0 ftmb,sec .vlk y)(6mfd1ops 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 phk7nyug+7zm19r) uz $12 \; m/s$ to $24 \; m/s$ in 4.8 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 frodd xerp vz9jdic.5y y04 49k*nm $18 \; m/s$ 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 spee.4lnz jc h4wb.d of $33 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprintku;o z5 qcdj+3g mmiu,w o;35her can burst out of the blocks to essentially top speed about giz+35j3ko uoqcmdu,5wm h;; $10.3 \; m/s$ in the first 12.7 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 fgd eq)c c/9c yv*cm;k: jqd0*from a speed of $15 \; m/s$ to rest in 5.08 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid m1.xdk:viroz ao5h10recl -1q arks 92 m long on the highway. Assuming a decelerraqcxi50o 11lh1o-v k.z:red ation of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck szclevh918izr/ -,oe 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 10,000-m run in less t jetp2 p)brtcttckw.3u o-4;-han 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then accelerate tbkrp;pj-e-.tc wtc 2uo3t4 ) at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$