Suppose that an object travels fromt8yo 8 5f x1g3yrrhuqv/e sn8/ one point in space to another. Make a comparison between the displacement and the distance travuh8 38 /fxqs yg1yrtev/5rno8eled.

  When is the average velocity of an object equal to th,60 kyem6qikye instantaneous velocity?

  A new car manufacturer advertises that their car can go 1c0a+k 5eb4tf8m gted"from zero to sixty in 8 s". This ism+t 5 0k41a8bcfedgt e a description of

  An object moving in the +x axis exuszfl/0x (dv93 9of1j lyp5neperiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x directionl kgu7 k1 bj+ va-vgwchz86u0,) begins to slow down as it approaches a traffic light. Make a statement concerning i608hlkgk,uvgw-7bvjz 1+ua cts acceleration.

  Suppose that a car traveling to the Weld c6ki-z x 13)ywqs8cst (-x direction) begins to slow down as it approaches a traffic light.q6xl31) zk8yswc i -dc Make a statement concerning its acceleration.

  Suppose that an object is moving luycof82l9m,sssqe 4x jh70+ with a constant velocity. Make a statement concerning its acceleratixo0hml,es c fs lq 427y98+sujon.

  If the velocity of an object ihr7mzy k-b96k ms bfx,kmm 1/1s zero, does it mean that the acceleration is zero? yrhmxm7bkf ,-b1 96/kskm z1mSupport your answer with an example.

  Can an object's velocity change direction when its(rc3vwui*.:nr *n 5rd bf orm+ acceleration is constant? Support your answer with an exampl *+ nbnv(di.c:*urwr 3 or5rfme.

  Suppose that an object is moving wivs-:ksz0trf-is sb qgt q1tz ;02)n-ouan:b /th constant acceleration. Make a statement c/2bqtvsbusso0r q -n;0f-: z :a1ns)t- tk gizoncerning its motion with respect to time.

  Can an object have increasing speed while its acceleration is decreasinappg5* x6uj 1yi/kygrrh 8;u2 g? Support your answer with a 5 pr6jk2/1 au;g8p*uxygr ihyn example.

  Suppose a can, after an i s4nt6wezav1v5uo(n.dlqai*g c2e( 8 nitial kick, moves up along a smooth hill of ice. Make icad5s(u6aq1.woeznge n * 2 (t84l vva statement concerning its acceleration.

  Under what condition is averaki b6x2)9o cwlge velocity equal to the average of the object's initial anbc)lox 9 2k6iwd final velocity?

  Objects A and B both sta+sndl0dbn18tia x u2+rt at rest. They both accelerate at the same rate. Howenb+at 02n+slddx1u8 iver, object A accelerates for twice 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 f96q/ lqjq5qho rom rest. They both accelerate at the same rate. However, object A accelerates for twiceqq6hq/5qo j9l the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released fromqi kl a7(+on) 1cmg,ou rest and falls in the absence of friction, which of the following is trueakligu,)qom n+1o7(c concerning its motion?

  When an object is released from rest and fallm34t6mt7yk2g yjc:fe s in the absence of friction, which of the ff2 m e76ktt3y cjmy:4gollowing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocivtogxsc), : xq9h1gc /ty and the acceleration when the ball reaches the higq9g,1x t h cs:x/g)ocvhest point.

  Suppose a ball is thrown straight up. What is its acceleration just before it r 9c5c:)hspsq3r+gu .x:bx kym eaches its highest point?.u bscp:k:g3)x+9 hcsyq x m5r

  Suppose a ball is thrown iawt ,cil436 h7wksgr.m,/*l (zxkha straight up, reaches a maximum height, then falls to its initial height. Make a statement about the dire 7*ixtm (k3 6i/4,gkar,alshwhw.l c zction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maxwkldy 304vjw: p s 0sk7m;z)tdimum height, then falls to its initial height. Make a statement about the direction of the velocity and accelws4 y: zkt k7mddjp)30wv s0;leration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistanc 3faihsz;c:5+vn6 cb , -bdrsge. Make a statement concerning,g3fdss b6z5 inb c :crv;ha-+ its acceleration.

  Suppose a skydiver jumps fr wosb;e g +blo 1qy9fiquf;6-9om a high-flying plane. What is her acceleration when she she reaches terminal velocigfql1; fub- sqi9yoe9wo + ;6bty?

  A ball is thrown vertically upward with a speed v. An identical secon/0m) jx ngila(d ball is thrown upward with a speed 2v (twice asa/)0x m n(ljgi fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a buj(t n0he8cq 2xilding. One second later, ball B is dropped from the same building. As time progresses, the distance between t2cq8hx e0j(nthem

  Ball A is dropped from the top of a building. One second later, ball B is dr. vjb)2+ pe v8;awroyhopped from the same buildi ).p;2v8+ vjeow ybharng. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, and fk1w(/) ow n/vu0 eggzg5 zdb*the other is1bk gzwu5/0 /zond(f evgwg) * thrown down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a *ow,rcjfmki4t282x m building. A second brick is thrown straight down from the same buildingr4m 2 jx28kwtmc,i fo*. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocya, guff7h98jfk wa (6tdln;3 ity in the +x axis. The position versus time graph of thiafka;7h(w 3u69dff tljn,g 8ys object is

  An object is moving with r:bb9hf zj4c2h7tmj, k dh 7k:constant non-zero acceleration in the +x axis. The position versus time g: 4hkm:t fd2bh9h zjc7rb7 ,kjraph of this object is

  An object is moving with constant non-zero velocity in the +x 4rlgqm*(( )nw/vwu ohaxis. The velocity versus time graph of this object iu*wo (r4v /mgwn hlq()s

  An object is moving with constant n3 vr6/i1y syvs+j;z7p a5dusson-zero acceleration in the +x axis. The velocity versus time graph of this obpz ; i/v36sasd1j+s vrs5uy7yject is

  The slope of a position versus timev *8i xytaji(e0 +hjauxgy-9q:i 7,ca graph gives

  The slope of a velocity versus time graph giv*.yzge xt 2imxk(kr4.es

  The area under a curve in an acceleration versus time graph giv 5 35ai.h)goqm 6z.zfk rgjwq;es

  The area under a curve in a velocic1d qge*688w f ualjv6ty versus time graph gives

  If the position versus time graph of an objen;spnn uv2.ou: 5b o0sct is a horizontal line, the object i ;p50:bsunno2n. vusos

  If the position versus time graph of an object is a vertical line, the or-q rge+ pzq 5smu(/)cytr8u1.m)dywhx9,ycbject is. rse-h w/x)rc q9)umry(zqpc5t y +y,gm8du 1

  If the velocity versus time graph of an 6g5mxawsu vag bj2*yw,hy -4: object is a horizontal line, the object isvj uhw,sagbg6a5-y xmw y*24:

  If the velocity versus time graph of an object is a sx3 a9 jkh, qw z76wamdb;upd*0traight line making an angle of 30 degrees with the time axis, th7aduw a p0k* 93zd6hwb;xj,q me object is

  An object moves 15.0 m north and qwfrhw5u/xyaj iw 4qm x9;:/2 then 11.0 m south. Find both the distance traveled and the magnitud2 :u9 w/yfa/;jr ix4qmqhwx5w e of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to move 12 km.au/wd 0fec q. upstream in a river flowing 6.0 km/wca0fueq.d . /h?

  55 mi/h is how many m/s? (1 mi = 16yfd,ut 2k:-lm tmq3uy5/ lnn509 m)

  What must be your average speed in order to travel 3f.qah/zwrfmf ,cx 3s3*m3l/n50 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) i0;sqrvrqha.d7 wc82 in 2 hours and 57 min. What is the average speedd sq.ivh w7rq8car2 ;0 of the runner in m/s?

  A car travels 90 km/h. How long does it takegfwst(3u +6a:2)dyhk 1t o rbi for it to travel 400 km?

  A ly (light year) is the distance th t bar9.9rjb6hat light travels in one year. The speed of l9b 9h 6ra.jrtbight 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/zoz+ e:c m13rrk:tph8 s/q- hub* hhl+h along a straight road and you look to the side for 4.0 s, how far do you travel during this inate:or3 /*r q1+h-z8bzh+: plhktshum ctentive period?

  If you run a complete loop around an oum( 9 y)n:mer kt:bh.gstdoor track (400 m), in 100 s, your average velok .ng)9:smt ym b:h(ercity is

  A polar bear starts at the North 5/c dk1lz5n dbPole. 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 bea51b d5z/lkcn dr's average speed?

  A polar bear starts at the North P/ 5e-gdupwmdf q1gu v9.-lh3q ole. 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 tak d-w.ldgq5-pu q3m1 g9/uvehf es 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h 4((;z 2dzlwi azltrdvp3p wah-9pb 2/for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after ; ddl3lb vw (hz/(r9ptz2wp 2za-pi4adriving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at k6x,e5 op(f +clnk :qw80 km/h and 160 km at 100 km/h. What is the average swxk nfl(:+o5 kc6e ,qppeed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What i,ob) ait6 szvnx *e;a:yv jwt9k,7go0s her average speed for 0 9t ; eyjv)tas:a7b6 wzng,okvo,*xithe trip?

  An airplane travels at 30w2kwks: nno( 0vn)sc (0 mi/h south for 2.00 h and then at 250 mi/h north for 750 milvs2wk)w s(nc0n :n (okes. What is the average speed for the trip?

  In a 400-m relay race the anchormado73 pf ilp/h)9u*uc rn (the person who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchormai cfp7/p*oluu r9d )3hn 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 comes to a stop after 12 s. The car's average8n5 7o21d)ch lx;ktx.srm zre velocity during deceleration was 59 km/h. What was the car's deceleration while slowin5h)el tk8z2xdmx;c s.7r 1norg down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average+liuu0fq w 1x) wn 9e)/ec5gwv rate of e0e ugc9 iv)/fw)w +lnqw1 xu5$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/ /g mfnzqm-1r-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 accelnds)0 :cvga w371ykdwerates at $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

  A car travels at 15 m/s for 10 s. It then speeds up with a constant accelero8v7 *: /cl a-i lx0taeg2ewrtationig0 vxoatl-*e8cw:a r e2t/l 7 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 3.0 m/s experiences a constant acq(d couq2 b xyx;tvk1)5/6qamceleration ofk uqo;ay xm 6vq2dc(5b)t/1q x $1.4 \; m/s^2$. What is the cart's displacement during the first 7.2 s of its motion?

  A bullet moving horizontally to the righrwoj+ffl/ mblv*kre:fsg/ dh.3/i: /t (+x direction) with a speed of 232 m/s strikes a sandbsrb:*j g rvi// //fe h3+wkfo:mdll .fag and penetrates a distance of 98.97 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircrb:uupl* b ; m6w+hjhilp8wx0,ogc v+7 aft carrier. It reaches a speed of 42 m/s at the end of the catapul70b whom+bpc;wuu+lj6:p 8 lvg hix ,*t, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moeyu 5h2v,oa9wves 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/d zb :sxmhj981 pcaf;4s to 80 m/s in a distance of 200 m. What is its average acceleration?j; sb4mhfa9xd1c :p8 z

  An object starts from rest and undergoes uniform acceleration. During the fqm4lcnw*f pt.9b tb h63l9ag8irst second it travels 4.8 m. How far will it travel durin9.q b*6 t3fl94whp gc taml8bng the third second?

  An object is moving in a straight line with constant acceleratioc hbk(mi8v+ h- hh z5bx k28o0.tduyo8n. Initially it is traveling ao8b50vbd.8-ky+hc ih hx28 otzmk (u ht 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and oef81rlne (55u1u pcdaccelerates 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 rgiextya 09;)9tu axp4 oad 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 waiting y e/vg(yczh;*kdgi 7rjon/7/at the inter;(k7 c/oiyhvg*gn ey/dj7z r/section starts ahead 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 cn svi8nzmx6nxy - .4*with a speed of 12 m/s on the surface of planet X where the acceleration due to granzxn .sm4*8yn c i-x6vvity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upwaf j l4t*pd7m h66 sbrw13zmk;yrd with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity isr* yb1s ld6p4t3jhwmm6fz;7 k $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upward with a speed of 15 m/s on the surface of plane(b/2nobfbg/m5oostua3 x 2d3+ jzee5 t X where tf z/b na+xu5om/o(b5se 3ej2otb 23 gdhe acceleration 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 s:ku +: ih;wae2a sdzz;urface of planet X where the acceleration u zi;ae s;w+ :hk:d2zadue 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 tha5e i0n:.o w1qgxs-jhln 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you exp1.i h0g-jswne 5lxq:o ect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of fvsj/27g;iyygi e (1i 19.6 m/s. What is its velocity after 3.00 s?(gfv ;1e/7i iyyig2 js

  A bullet shot straight up returns to its starti17gt mwf l:8/r /ub xov(tizt,ng point in 17 s. What is the initial :,ri( t zb1/lw8ovf ut7t/xmgspeed of the bullet?

  A ball is thrown straighti*pntcrq8vrd ;4 +cq, pdp5m: up with a speed of 36.0 m/s. How long does it take to return t;c,5 di:qd rv*p c 4n8m+ptprqo its starting point?

  A ball is thrown downward from the top of a building with an il0z7-x4s. y qx a w3rudjt6oh-nitial speed of 6 m/s. It strikes the ground after 4.7 s. How hiy0tarjo7-suq. hx- zl4d 36xwgh is the building?

  A ball is thrown straighgip4uw hgk9s1hl;, r 9t up with a speed of 30 m/s. (only fill in numerical value in the bu,h9 ;wkgl9s pi1 4rghlanks)
(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 intoxvy++ey 0e6vr -up( lf the air with a speed of 35.5 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 3 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 6 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 6.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what i s4 -1uu/0y +unudrj( eb7l5fpsqp7 qw2soid.s the velocity at t = 1.0 s?

  In Fig. below, what is the vebrticfo+km9v(*//sxj l 6,t vlocity at t = 2.5 s?

  In Fig. below, what is the velocity4acrpjo6n0h -ku q)x+ at t = 4.0 s?

  In Fig. below, what is the velocity a9m7x mnli8y) icdhy+r1,u2 eot t = 5.5 s?

  In Fig. below, what is the average velocity froy/x 5l2 2(9 nmupffqrxm 0 to 4.0 s?

  In Fig. below, what is the average 1bcll3 to b 86sh,1phhvelocity from 0 to 6.0 s?

  In Fig. below, what .ge0 rjav h ()1u7znqris the acceleration at 1.0 s?

  In Fig. below, what is the acceleration 28)pl zwa qiizoe(,mf*jaau3s l//,cat 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0xeco0fq8 89r,r/tirg ejz , c, s?

  In Fig. below, what i 8x-;+ta* gra9fdem3-ofo82ptfrm q i l0rb4ws the average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displ7dnaaytkv2(1a 7oj ( yacement from 0 to 8.0 s?

Does a car speedometer measure1m k6socy v-c pb,pbh;9iv*:n speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is co2(co z)dhudwb (1)x0/fcxrbze,ibx* nstant.

  The velocity of an object can be negative when its accelera)jf (xuk5ro8ytion is positive.

  If one object has a greater sp9ryk :v y0ft9zz* uu.jeed than a second object, the first must have a grkyrv0:z9 u . ftjz*9yueater acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling zyh0pcdl, wx )4je.dkte-)- f 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 acceleration decreaseszvei *7oe *i2g5ggzol d/v l.u and.22.

  A baseball player hits a foul ball straight up into the air. It leaves the bat w:0/82u su ,(j5:ou ajpqoij +gjh qvwnkjnu8)ith a sp8,vwj)jnq:8jn/s po+uj h oiuu:2u( g0a jq5k eed 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, wha, mt v, bs+s9xjkl4aoyx/u:- wt is happening to its acceleration, how 9jy/sb 4-+aots kl:vx u, ,wmxdoes it change if air friction is ignored?

  As a freely falling object speeds up, what idc4 4v(ntd y6qs happening to its acceleration, how does it change if air friction CAN NOT be q6d(4y ndct 4vignored?

  An object that is thrown vertically upward will return to its originacjd8+ eyoh zq:ez h5,-l position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will th+h: d zoyhcqe,-5e8jz is result be altered?

  An object can have zero velocity and nonzero accelerati3/o;vqzx zh8t0 ahkd *on at the same time.

  An object can have nonzero velocity and zero acceleration at the same timer tc7ir0:uji-.

  An elevator moving from the second flonrz- :lqbfc4 *.nquq 3or to the fifth floor making no stops along the wan : q-3*q4.zucrbq fnly has zero acceleration all the time.

  A rolling ball moves f m3l :s)6ysebgnlui*+g fx17d iivq:8rom $x_1=3.1 \mathrm{~cm}$ to $x_2=-7.8 \mathrm{~cm}$ during the time from $t_1=1.5 \mathrm{~s}$ 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 $t_1=-4.2 \mathrm{~s}$ is at $x_1=3.0 \mathrm{~cm}$ and at $t_2=4.1 \mathrm{~s}$ is at $x_2=8.0 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-mile+c,,vrfzdj-5l yhb ,i ($1 \; mile = 1609 \; m$) track in a total time of 9.6 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 licsub6sozd1pt*u705 h ne, moving 99 m away in 10.8 s. It then turns ab 6dszthbo7uup*c 051s ruptly 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 fromk1e, i)5o4njg ip:n,vhla1vz $13 \; m/s$ to $24 \; m/s$ in 4.1 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 fromguhag 0xdq)b6nv1b0 + $15 \; m/s$ to rest in a distance of 63 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must r: yc.q*j d *y:rdisyr /*is;d46ygsqueach a speed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can bursk3e 2 dn-p ujos9ie)/st out of the blocks to essentially top speed abou n2ieje-)p/ duo9ks s3t $10.5 \; m/s$ in the first 12.3 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 uniformllbbc+, e 2zze:y from a speed of $18 \; m/s$ to rest in 5.79 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 highway. Assn ; qb3vsbsyd)cl7c;bzn / -sy7ig4t:uming a decelq:- ;nb7cs icss l3b/vzg n ;4bdt)7yyeration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going : xqpfwz,y/7m )p)6y j bknbc)$25 \; m/s$ 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 rq xs9uxb9 iiq 6 5:yiov5tvh)y56oa3aun in less than 30.0 min. After exactly 27.0 min, there a5s oyq v)a:tx5i9qu6a xi93yo b65ih vre still 1100 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$