Suppose that an object travels from one point in space to another. 7nmphuk ,;se 7lx9r/ hzm ;uw;Make a comparison between the displacement and the distance tra7 lp mhm/7;s;k9ux n,zehruw;veled.

  When is the average velocity of an object equal to tzgr- dnx *;y,-pyvq3 rhe instantaneous velocity?

  A new car manufacturer advertises that their car can go "fromq 5 gdlqp3l;/e,h0)g t .rrowk zero to sixty in 8 s". This is a l5.o/wt)r gg 0e q;kd lh,rqp3description of

  An object moving in the +x axis experiences an acceleration of 970x(etq5 6pokiwr0 rkuf.a v $2.0 \; m/s^2$. This means the object is

  Suppose that a car travrif-54c5d 6,1xfy y8mftz0nls (oacv eling to the East (+x direction) begins to slow down as itv(ofy aftcxry1s,-4m5 lz 6i58cd fn0 approaches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling tottzb83q k3g3 or(-oh;wz80 e qohs vg) the West (-x direction) begins to slow down as it approaches a traffic light. Make a statemen)zgs8o -(t0hkt;8 gozoq q3ebrhw33 vt concerning its acceleration.

  Suppose that an object is moving with a constant velocivzmbx 2.xpee)o5oq o) 6aqz,8ty. Make a statement concerning its ,6zeopozx.q om )a85q)ex vb2acceleration.

  If the velocity of an object is zero, doeskzkk:m-, 0rhw : iyy1z it mean that the acceleration is zero? Support your answer with an examplezrwzk, yk0k: m1i -yh:.

  Can an object's velocity change direction :1 r( sbl-lkurt7sm*cwhen its acceleration is constant? Supports:*lr-1mcbtks( u rl 7 your answer with an example.

  Suppose that an object is moving with constant accelerat (f jiwgff.c)pb:ph 9-hf9.psion. Make a statement concerning its motion with cfjh9pg shi p.f wfp)f9.-b:(respect to time.

  Can an object have increasing specuvk d(/2ct(x3k(g5 *mrnl c med while its acceleration is decreasing? Supporr 2t3kd(ccm5/(*xu(c vn glk mt your answer with an example.

  Suppose a can, after an initial kick, moves up along a smootop n,c;nmy 2lu ;gh:/rh hill of ice. Make a statement cmp;n 2r:l/g ynu; ,ochoncerning its acceleration.

  Under what condition is average velocity equal to the average of 3 z 4 +-edtk4pxb0nxootb7-bvthe object's inn+k t7x3pto4dbe-4x -bbz 0 ovitial and final velocity?

  Objects A and B both start at rest.zc6it2mob;ra v( (tc 1 They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A co cmai 2zvb(1;tco(rt6mpared to that of object B?

  Objects A and B both start from rest. They bot9 d(/n1o xmikf;y i2smh accelerate at the same rate. However, obsi im mxo(9/dyk12;nf ject 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 thr5 9drpcgv:q b(h9.whe absence of friction, which of the(.rgp5hvbh 9c9drw : q following is true concerning its motion?

  When an object is released from rest and falls in the a7svixp4l2 z9jbsence of friction, which of the following is true concerning xji7ps2 94zlv its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocit/nf b dv+(3z+2v rmmgly and the acceleratio lb+ f2mz+vmgd3r(/ vnn when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration justft)65eha;mqplv, ,r i before it reaches its qe fvlm;)65pa ,,hrithighest point?

  Suppose a ball is thrown stra 9hs 4ho,+k9jivc* abxight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleoh jh4vc*a 9x+9 kbs,iration as the ball is going up.

  A ball is thrown straightxnbm b 5c)v 5ls3iv8f/ ,rqbt) up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is comlrbf c b3 vx55b8/s)ivmnt)q,ing down.

  Suppose a ball is thrown downward in the absence of air resistax8- ic9w exrzo;lgdk/m hb .)8nce. Make a statement concerning its acceleration.9x-c. i) l8w hgkbo8e;/mrd zx

  Suppose a skydiver jumps from a high-flying plane. What is her ac9 y7(vix kbvu:ub0o5 uceleration when s7ivux 5bu 9o(bk v:y0uhe she reaches terminal velocity?

  A ball is thrown vertically upwarmpq ,5s ll3utw t-qov(7f 3cl9d with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio l,m t7pvlcu qq5tw-s3o39(f l 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 building. One second la(. jmo0h vgq;q di,+lvc6xb3 jter, ball B is dropped from the same building. As time progresses, the disdl0qxjvgvo; .h b36j, (im c+qtance between them

  Ball A is dropped from the top of a building. One secoz2 3s:hp.;n6 gitvvy pnd later, ball B is dropped from t n2pti;vp.3sgzh:6 vyhe same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. i2 tni*3 /xqdg One is thrown up, and the other / q ti3n2gdi*xis 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 building. A second brick is thrown syxo q d;6 6oc qfohh6dcp,2c5gl:up*) traight down from the same building. They are released at the same time. Neglect air resistance. Compare the acceleratq);,6 5plfq odxghoud2ohcpc66y* :cions of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The positvnb h qy-1, pcjcr pn4,;c sk*d.)+ebuion versus time grapv;s.*n4 1) rb+eh c-,kcdbcq pjyu,nph of this object is

  An object is moving with constant non-zero accelerati6x(: aj :lu0i+vhz ntton in the +x axis. The position versus time graph of this xu0+hlt:: t jvi(naz6 object is

  An object is moving with constant non-zero velocity in the +x axt.dh ae cref ,57i.x:vis. The velocity versus time graph of this obje5 x.:7 ca. eev,trifhdct is

  An object is moving with constant non-zero acceleration in the +x axis. The vbu +dix 7k44fcdnv: 6xelocity versus time graph of th7kxvx c6:n+ud 4fb 4diis object is

  The slope of a position versus time gr / +vt49pkqvshaph gives

  The slope of a velocit,p:s z8tkai5ay versus time graph gives

  The area under a curve in an acceleration versus a)sop me8/ )gd8esc4atime graph gives

  The area under a curve in a velocity versus time gfhuq0n814 7hgx96bvb os9bp9zk8 nn graph gives

  If the position versus time graph of an5i rljj0 qv yi7:,4cfn object is a horizontal line, the object njr4i5yicf7l: jq0v ,is

  If the position versus timelt 9rbd ,, yyp4w)81hrzcqg h8 graph of an object is a vertical line, the object isd y prcq)98z,g8b,hhwytl 4 1r

  If the velocity versus time graph of an ob:(uvd 8ir kr9* vfjf5vject is a horizontal line, the object iir8*f9(f j dvv5v:ukrs

  If the velocity versus time graph *1j*aqfujo2 8tw.z jf of an object is a straight line making an angle of 30 degf j*o j.tu8 zj*wa21fqrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance tr:og2q :va khf3aveled and the magnitude of the displacemenogfa2: :vq3kh t vector.

  A boat can move at 30 km/h in still watv*-ht.u.;n -vzg gxcb ak9 ga(er. How long will it take to move 12 km upstream ic- tbnx-vh ag;gg9u(zva*.. kn a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609:h(nrr +dci ;mr(n io; m)

  What must be your averu qqsdm,g6hc7i :9b l)age speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) nlw i)j8-5ikrugy7y*,hi me5hf+pg ul6- 4su in 2 hours and 57 min. What is the average speed of the hl ilnphyj4 guku6*u -5, e7 rf8 sgiwy-im+5)runner in m/s?

  A car travels 90 km/57m+tslcjw t/plrw )davy 422h. How long does it take for it to travel 400 km?

  A ly (light year) is the distance that light tb6lsli(ug5 o)av1w lzts r z z),cs116ravels in one year. The speed of ligr(lt llz1g5ousa 6 bcs1 s)z,w1 )ivz6ht 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 straicfmij8p3d:abokbom,1b c cx4 8 j9eca7+9qp-ght road and you look to the side for 4.0 s, how far do you travel during this inatteno x9b ma fp3c7m1cidq8pc,kb -jjba 89+:oec4tive period?

  If you run a complete loop around an o(ql bs ky)w5 .urlhl,4utdoor track (400 m), in 100 s, your average velocity 5q,4rlku )h.ll(b wy sis

  A polar bear starts avgehfy-147 u u6tju pj0zx5 h.t the North 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.e7ztf450 - vuhuxp6guy . h1jj This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. 6stdbn vc p81fx3l49wpi3o/r 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 tvrwt8 d x s61fco49p/ilbp33nakes 45 min. What was the bear's average velocity?

  You are driving home on ah2 i)hg;gd-nr weekend from 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 hours2d;hirh g n)g- and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 84rj7,k6tujz 6(aly4wsyf s :v0 km/h and 160 km at 100 km/h. What is the average speed of the motoyjtuz4 4wa:6 vrj(6 k7f ,sslyrist for this trip?

  A motorist travels for 3.0 h at 80 km/h dqh 7deke(cx/c5(tn. and 2.0 h at 100 km/h. What is her average sxchqn 7edkdc((e/t5.peed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then aqms/ xoy oc +ody)*1 v,ct-0i(qxq4pot 250 mi/h north for 750 miles. What is the-scvy ox +/o0 ,o4*ptxqoqi m1()ycqd average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last:1thstlhb 349tu.irt fz(c( hzy,ma0 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 runner sta0lcu (391r ta zsf( tytizbhm:.4ht,hrts 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 27:u . iclu;dwx0xs r m/afp6e12 s. The car's average velocity during deceleration was 78 km/h. What was the p cu207 ilxwd 6e:u.as;xfmr/car's deceleration while slowing down?

  An airplane increases its xg.zrl,t8 ymvv hc.(3 u2596gxff,ohl. gzgxspeed from 100 m/s to 160 m/s, at the average rate of vg6,clvg 23.f(ml. rxo xg.8u5g,y z 9hxztfh$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate of jmwm /mr,h+4/z iopn*$2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and 1 up4 xxd n6sy)ud(, jpbjsd0.accelerates 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 acce1(,k cii v9zpglerationcp9 (izk v1ig, 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 5.9 m,l zyu uid3pw 12;rkh3/s experiences a constant acceleration oz;2ry wup3 3uk i1dhl,f $4.4 \; m/s^2$. What is the cart's displacement during the first 4.5 s of its motion?

  A bullet moving horizontally to the right (+x direction) with qq4a pl2hh8a0a speed of 535 m/s strikes a sandbag and penetratesh qh40l a82aqp a distance of 42.02 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is 9 l2x*gsehc2ilaunched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of theix lch2*9g 2se 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 constant acceleration ot/e/mmrnb *awi0c1s8f $2.0 \; m/s^2$ 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. What is its average aeh9/dwlj1tea v0n:,* vi.) neows-cu cceleration)nv,jtie- usv 1hdc/0el.owa*w 9:en ?

  An object starts from rest and undergoes uniform acceleration. During the fir:af 4 dvpd2/8 (vaylpnopl 4o7q+z0 uyst second it travels 9.0 m. dn8po auyo4:d0q plyvvap+/ fz(4 2l7How far will it travel during the third second?

  An object is moving in a st+prvn 9*wbocc .cv :t7raight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s tc:ov9+npr.c*7v bcw. How far does it move during this time?

  A car starts from rest and accelerates uniff*/ ihbchei9 6ormly 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 dgqihyu7 ( 7m3 *2jdvhnry 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 turn6ol gzn8ug;z: o( ,fjns green, a car that has been waiting at the intersection starts ahead with a con goz:n(gnj 8z6ul;,of stant 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 witha(gj: l6y jfm:wkuee yk+)l48 w:rjf( a speed of 12 m/s on the surface of planet X where the acceleration dullu(4y fea)rmy(j6 w+j wekg8j :::kfe 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 k:c; a cu8 z1y7iag6xdm/s on the surface of planet X where the acce768a :yi;c zuxkgdca 1leration due to gravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upward with a speed of 15 m/s on the surface of pla8z7np4z7ftl ve /2w5vlu 4zrmnet X where the acceleration due to gln t4fv8vzpm zr4 w257/uelz7ravity 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 upwaru)aq6ck5hn8j+nu +ajxm /6x w1nf sxtdrh)+/ d with a speed of 14 m/s on the surface of planet X wheremx ++ cnja)kuah q8u/w61h/5)tdfsn+njr6 xx 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 0.10c3ajg (y31 mfk s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall gc313( afmkyj before you catch it?

  A ball is thrown upward at a velocity oci n ypbz.x5.gzk+qt4*g0g.df 19.6 m/s. What is its velocity after 3.0 kc. z5ig0yxp.*db t.4 qz+ngg0 s?

  A bullet shot straight up returns to its starting point in 18 s. Whcfjn w 9o;:s*wat is the iniso*wn;9j c :fwtial speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it t aw/oetiwu2rc+x e/+ +ake to return to its ot c++/w/ua+ex wir2e starting point?

  A ball is thrown downward from the top of a building with an initdybx;i-imc+*zhhy4z ,x ;x,u ial speed of 17 m/s. It strikes the ground after 1.3 s-dxy 4u*i im x,z+;bz hcy;h,x. How high is the building?

  A ball is thrown straight up with a speed.:6 vz4ociq ls of 30 m/s. (only fill in numerical value in t.o zl:qv6cs4i he blanks)
(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 into the air with a speed of 47.3 mf 1loym*2k6c r. quhe./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 5 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 5.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velo ,w43guztp3 cjt9/c mzcity at t = 1.0 s?

  In Fig. below, what is the velocity at f2 p6j /qjbz7at = 2.5 s?

  In Fig. below, what is t3gqter4wx 7 x 4qi:fn;he velocity at t = 4.0 s?

  In Fig. below, what is thhfyie*;bu 794z dfsc6 and.3 ne velocity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.g wxb9m1 v-cqk1.tbmp:z -yc. 0 s?

  In Fig. below, what is the average qo,/it( fxpzkp,q5u:velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration a.8 6x idojjn5cal5 2oet 1.0 s?

  In Fig. below, what is the acs 38y;nd9;9lte5aob 8b hgqu5io4 mk ropui)9celeration at 3.0 s?

  In Fig. below, what is 8ok ijf 0)ws,ythe average acceleration from 0 to 5.0 s?

  In Fig. below, what is the average accele 1ol.ww,kgfn2t:eoua ob-)b 9i 7:doiration from 0 to 8.0 s?

  In Fig. below, what uk6evh: *tv8++,lgq tkbt i2cdb0 ;k cis the displacement from 0 to 8.0 s?

Does a car speedometer measurulz +qcndo a+ -950 m3illmz+we speed, velocity? {speed|velocity}

  An object can have a varying spefyrm9 ya:4k8f e6zf1 rhyh j;j(4p1t oed if its velocity is constant.

  The velocity of an object can be ndb- k0zkf)/nym 7;ilsegative when its acceleration is positive.

  If one object has a greater speed than a second object, the first mn gx*) ahww:5z;5hz(z4tnyo9 l /ife yust have a greater accelogy:)th h wyxnw55(zifze /a9n4 *;zleration.

  Two cars emerge side by sprb z61zkyah w0l(ksuk01z0d0w 8ae*ide from a 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 increasing in speed as its acceleration dez8r1 zlgj,1hc creases.

  A baseball player hits a fouws/ s;g9n)bmgl ball straight up into the air. It leaves the bat with a speed ofn;/m w )sbgsg9 $120 \; km/h$. 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-w.oh eh(/,ct ut kwq)ng to its acceleration, how does it change if air fr wht/()w. uek-hcoq,tiction is ignored?

  As a freely falling object speeds up, what is 4vs2agvx 3pj2i5kfl -/ xxh43vf nkx3happening to its acceleration, how h/v2k fxlx 3axv2g kp3i-3s5nj4f4 xvdoes it change if air friction CAN NOT be ignored?

  An object that is thrown vv4zg*3 xv lef my0)i*yertically upward will return to its original position with the sa* yegz lvv) *ym30xfi4me speed 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 acceleration at the c:8 crx*jaef m:5qd6hsame time.

  An object can have nonzero velocity and zero acc9,vszrrfl*ag q( 4ryv kdd (bel 6s.9(eleration at the same time.

  An elevator moving from the sec.ss6dx:3ipp j-e,1ad:mrj4 nk w k 1eaond floor to the fifth floor making no stops along the way has zero acceleration all the tr npk1j jm.ed4 s1s i,w:: aadx6ep-3kime.

  A rolling ball moves wg-x.h kh+ kmc+ymm1l( wn+3s from $x_1=1.6 \mathrm{~cm}$ to $x_2=-6.9 \mathrm{~cm}$ during the time from $t_1=1.3 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.4 \mathrm{~s}$ is at $x_1=2.7 \mathrm{~cm}$ and at $t_2=3.7 \mathrm{~s}$ is at $x_2=7.6 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a 1) c(jj ub:wd u4mwaz)quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.8 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainer in a straight line, ln*56q+g g0:cj mmmqhe e 6s6nmoving 88 m away in 11.9 s. It then turns abruptly and gallops halfway back in 4.8 s. Calculate (a) its avgeq6j:65 e mm0g*ln 6s+mqnch erage 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 frxpbb k)g -h n;)+da8neom $11 \; m/s$ to $24 \; m/s$ in 4.4 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 fro8(l pttaqkc 35 or1q a*p*vli0m $20 \; m/s$ to rest in a distance of 81 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a su3zl3ysgex-o h+- o(0mnr46sph n o0zpeed of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.3 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst o. ptj 6udv.d7rsj0q* wut of the blocks to essentially top speed abouwrp.j*s u.j60 qvd7dtt $11.1 \; m/s$ in the first 11.0 m of the race. What is the average acceleration of this sprinter?  (数值)  $m/s^2$ and how long does it take her to reach that speed?  (数值)  $s$

  A car slows down uniformly from a speedk a,bs: d n*vt2s*qf0r of $21 \; m/s$ to rest in 5.05 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. Assuming go52h0fs9ux :q8gyle 3rxppp */w yu.b8mb5wa 88: /wsyr wml 3gubq hex5yboup 95xgf0 *pp.2deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goin f x /a.aik**v8,nslh0zsu7pgg $25 \; m/s$ 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 i5(l1 lyru hyy kt:pkqi;ga;4t9c8 pm+n less than 30.0 min. After exactly 27.0 min, there+k 8ti: k up9yatgp5 lm4 hq;cy(1;lyr are 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?    $s$