Suppose that an object travels from one point in space to a5;b m i-ib+*uw)c)quqk x;co xqbp,n+nother. Make a comparison between the displacement and the distance traveled q*xb)q mb, bcwou; i+5nq-x;k)+ucpi.

  When is the average velocity of an object equ0prsjtq f9 a+* 2cfd:cal to the instantaneous velocity?

  A new car manufacturer advertises that their ymulz 4v1;axr+ 1ffn 2car can go "from zero to sixty in 8 s". This is a descfv2 mflu1 z4;1y nxar+ription of

  An object moving in the +x axis evc (tocaz9i* fem6kct4o:- (kxperiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow down as1 d-b-ut)kfhydj.ql z)g (6 zs it app ddstqfz )1zb.u6- k)lhj( gy-roaches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car travelinnqv 8a8rke 84p4fqyb:zlt0 i2g to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its ac4rtazv8k02ef: qpl8ynq48 ibceleration.

  Suppose that an object is moving with a constant velocity. Make6.wg2(a55dof4cb:kif,j tf atqx ji: a statement concerning it fgfa6(f:4i wok b.jt:djitxa52, 5qcs acceleration.

  If the velocity of an object is zero, z092(qi 7mz-r9ds7fahumla cdoes it mean that the acceleration is zero? Support your answer with an exa9mqz9fc h i7 l-(7aaz02drsmu mple.

  Can an object's velocity change directiona1pa knel mm(v*),nu* rl(p3y when its acceleration is constant? Support your answer with an exle vnpk)r,1(y**umama 3 nl(p ample.

  Suppose that an object is moving with constant acceleration. Ms8+t s9odq-5ku vl/k 7cd5acaake a statement concerning its motion with respecd9l occ55ksk+qu7 as -ta/8dv t to time.

  Can an object have increasing speed while its acceleration is decreaoa+8*7 y5beg6u0inhrax wak7 qg2xo 2sing? Support your answer 2aa280w h7e qo6obxya r7g+5*g knx iuwith an example.

  Suppose a can, after an inwn c /ybwn*,t3 .rwarg2fc/6oi3tp 5n .+jao citial kick, moves up along a smooth hill of ice. Make a statement concerning / c +a*i rpnw.c.wo,t5f32r6wna gtb3ny coj/its acceleration.

  Under what condition is average velocity equal to the averag-mlzmd :wu7u 9awi(a7g c:gi ,e of the object's initial and finalm:7, (- :luidgziawa gcw9um7 velocity?

  Objects A and B both start at rest. They both accelerate at the sam3 ps c+ae;+h jk3plun(e rate. However, object A accelerates for twice tl u+s3p(jh c+p3a;ken he 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 ag 5e oe ji-9(qjeea 7u/ rww.w/wuu7l-ccelerate at the same rate. However, object A accelerates for twice theeju/e/goj7qulwr (.9a--euew 7 wi5w 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 f2 ohq b g-bg/a8qc/*awao 7p2vgos:0m alls in the absence of friction, which of the following is true concerning its mo2gosmo / gb- *bgq2 a/whoac:q7vpa80tion?

  When an object is reljf pgtq:lv 0)5.dbb5 fh/6clgeased from rest and falls in the absence of friction, which odh5: vgbp.) 60tbq 5f gfcj/llf the following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a .qrap3, 911 18unsgt3 x2 vbfqwrub cqstatement about the velocity and the accelq gq13r.vt2nu w c1ub18 a,3f9rqxb speration when the ball reaches the highest point.

  Suppose a ball is thrown straight uxftfzk;7( lx ym v+4*dp. What is its acceleration just before it reaches its highest poi( ;vdk7+mlf4x ytzfx *nt?

  Suppose a ball is thrown straight up, reaches a maximum height, thena3hg cjxph*k* 8vo6t7+sr 9mq falls to its initial height. Make a statement about the direction of the velocity and accelerati 8 kj+*a q*x9s6hmh37roctvpgon as the ball is going up.

  A ball is thrown strainiw1.qs 4e 0xwght 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 coming dow1x i4sq 0ne.wwn.

  Suppose a ball is thrown downward in the 4g ; o3v:up052cix1nus npxlhabsence of air resistance. Make a statement cn21ulx 3gvp:;h np4u x5 0cosioncerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her accelerto *qir; )j8 2 4t6uggsehnhz6ation when she she rt)h 6utn g4ies h6q2g* zr;8ojeaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identicalnr3.2 p *qcbl0 igeqy( second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the f*elbq2(0 cigpr.3q y nirst ball?)

  Ball A is dropped from the top of a buildinzs)-ff0e1s-cwr 0ybg m z/ds9g. One second later, ball B is dropped from the same building. As time progresses, the distanc- zysg)w1f0-9 reczss0fd/b m e between them

  Ball A is dropped from the top of a bu/ nxb *6lblbbzhl(*,,z wszxn79 8hwe ilding. One second later, ball B is dropped from the same building. As time progresses, the difference in their speeh w,l8x7 *nbln/h( lb,sb zwezz*9b6xds

  Two objects are thrown from the top of a tad23kily3g( .l3v ejrs ll building. One is thrown up, and the other is thrown down, both with the same initial speed. gsdl3lk2r 3i3jye (v.What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brirkq9alwnu-o4uf3. 9 uck is thrown straight down from the same building. T9fo u ukaru3ql-9w.n 4hey are released at 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 t.qmxq 5ny9e -sf wkjy0*), dxgy )hq7position versus fyxk*,0 w9qmj qs-5ye)dtn x. y7 q)hgtime graph of this object is

  An object is moving with constant non-zero accelerati 9; r sy0/dqakpa7l/scon in the +x axis. The position vyd0/rkca9/; sql 7psa ersus time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The veloc0b3k g5xp1 yqpity versus p0xybkp 1 q53gtime graph of this object is

  An object is moving with constant non-zero acceleraye 55qg+t.5 tztx,v: 9kbrlam tion in the +x axis. The velocity versus tibq+z t 9a5.m5k 5:xver,tg yltme graph of this object is

  The slope of a position versus thya3;w9 g5jy zeel1kj1dd,/*:g xq yb ime graph gives

  The slope of a velocity ver(w,feb8bs :ji sus time graph gives

  The area under a curve in an acceleration verrmlma1r;z2 1 ko*:ol zsus time graph gives

  The area under a curve in a velocity versus c-8pwcqhah cf 4rl.-(time graph gives

  If the position versus time gm dj+(c;7;.wk dyybr vraph of an object is a horizontal line, the object is7(kydy b rj;cmv;w+ .d

  If the position versus time graph of an object;e 6w/r eguww4 is a vertical line, the object isrw/uwew46;g e

  If the velocity versus time graph of an object is a horizonta1h mq0 r6s qaggi4m--qcy0te /+k-bn ml line, the object i0m6k byiq-s-mgc-htar /n0q4q e g1m+s

  If the velocity versus time graph of an object is a strpxhh v0aoite r;i*/ /2 06afktaight line making an angle of 30 degrees with the tfix ta/; h0p6t2i/aek vh0ro*ime axis, the object is

  An object moves 15.0 m north and then 11.0 m so vp 88ls9ea9cuuth. Find both the distance traveled and the magnitude of the displacement ve9lsc8 v a8pue9ctor.

  A boat can move at 30 km/h in still water.1hj(cyt c ,jf,02ipodu1 l1 pu How long will it take to move 12 km upstream in atd2 c1oy1 j,,pjl i(cupu1h0f river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 -p jaqypqe18ki:hb39 mi = 1609 m)

  What must be your average umg n6m rg90-jspeed in order to travel 350 km in 5.15 h?

  A runner ran the mara8;+j+n fnzmjython (approximately 42.0 km) in 2 hours and 57 min. What is the j;zjyf+ +n8nm average speed of the runner in m/s?

  A car travels 90 km/h. H52u nk pe vfzc76z(5uzxwr1k;ow long does it take for it to travel 400 km?

  A ly (light year) is the distance that d /holbtok 8ese96wbw)2i:m u 5h e;(olight travels in one year. The speed of light iss:89khe2bwelw/;hdum56 t e(oo ob )i $3.00 \times 10^8 \; m/s$. 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 stro0gzx3;pj p-0gs l:ai aight road and you look to the side for 4.0 s, how far:s jaoiz0 -ggp0 lx;3p do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 ms -b8uvtj,m 69ka6mtx), in 100 s, your average velocity i8 subx9mmt,6j6 vta-ks

  A polar bear starts at the North Pole. It travels 1ya *w:schsr,y27j*r b t p8la4.0 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 t rcjtb*l2s ,a8a:* sryw7yp h4akes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It trb y-;tizu 12 :atm,5ywgqdrl/avels 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 ave-izqyb5w/ra d1g t tym;,2lu: rage velocity?

  You are driving home on a weekend from school at 55 mi/h for 1-zjlzb(9lg 8l10 miles. It then starts to snow and yougz l8-9(bzljl slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 1g kly)fh2 e1u;00 km/h. What is the average speed of theu;l fh) e1ykg2 motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0c(35;4tcgzxa8e/ s5o9 dh q nhbscmdc n3y2m. h at 100 km/h. What is her avero.bcnz(nxh 9t mc43c3s mhgaes28 ;5yd c5d/q age speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h anjelm ; o.5jofyw-1g3 cd then at 250 mi/h north for ;1w5 e y.clmo of3gjj-750 miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (:x;hdu5- 2m2pqn idh dthe 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, c-hnd:;d dqpxuh 25 m2ian 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 11 s. The7zp7kiouod (c*ie( tor b8b73 car's average velocity during deceleration was 79 km/h. What was the car' 7d8k3(ebicuo o*r7( 7otzibps deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the a *1mp;9padr zrg.bky+ verage rate of kg m91ar; z*rppyb.d+ $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h,5jj qmja hb*: 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 accytfgiu) u(kn me a3h843+hp5t elerates 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 lu;c xgw4 euvx4 fafe/r4*2bu)0ol ,r s. It then speeds up with a constant acceleration of 4)o /f4vagr0r ;eueflu4 wub *lxx2,c$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 7.5 m/s experiences a constant accewc6jdfkzia: 6wxtsg l p(dd( ;g1+5 1dleration of ; 1kt pf6w(dg+ jdld w6gc xsz15:aid($4.9 \; m/s^2$. What is the cart's displacement during the first 7.0 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed aw6)mfh ifkn6t( n * )xxklf,lbm -2p2of 201 m/s strikes a sandbag and penetrates a distance of 83.00 cm. What l6xhlkfptiaw( f nx*k 2m-6)b fm2 )n,is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrie x+7ddxcyj4*a89 ,u f4bdbkppr. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 f8j4dd7x*,d+aupy b4 xpbk c9 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves7o*p00o .md utsph3b u 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/) .xvuo/cf:ca s to 80 m/s in a distance of 200 m. What is its average acce)cx o:fa/c. vuleration?

  An object starts from rest and undergoes uniform acceleration. During the first( vmpd he)zkco7l.4 cy7q2t(c second it travels 4.5 m. Hoo. ekvmtlh 2ccc yz(4 7p7()dqw far will it travel during the third second?

  An object is moving in a straight line with constant acceleration. Initiallyb/6x fqvy whvt v5)p82 it is traveling at 16 m/s. Three seconds later it isvxyfv )6v/8h2t b 5wqp traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and acj(;i+yf)kmvxxxy 1:e9sa lk ,celerates 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 can decelerate atsu+;h/b + yn/ku1 w)nh.acyvl 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 x1bggwv+x*3j5m*d/ x:f an c*6cnmau has been waiting at the intersection starts ahead with a constant accelern /mum fg+c*x15 *n3d gvax:ax6*w cbjation 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 1j w3 ms6+37nr 6tin*dzwd 4cfv2 m/s on the surface of planet X where 6rz m46d3niv*+w 37cwdtsjnfthe 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 obb( w);esi n+1m2dor.pxm,j -kxx o-df 12 m/s on the surface of planet X where the acceleration.b ) x2 nkodosmew,drp-(x1m i;- bx+j 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 spee,; ch;j 3ppgng3xgjn 0d of 15 m/s on the surface of planet X where the acce3;gn , j0jxghp3g;pc nleration 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 3oegebiefb;g-jwz *z )v9 )8 s14 m/s on the surface of planet X where v wz zg;3ig*-o e8bje)b9s)fethe 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 s8 m:lm cwv. -v;g:5bacu;bny p. If your friend holds a ruler between your fingers and releases it without warning, how far canc v5;alu-yb; :p.gvw:mnc b8m you expect the ruler to fall before you catch it?

  A ball is thrown upwar kq-4kp,z lp5734okuv)2n x crg4 nhlud at a velocity of 19.6 m/s. What is its velocity after 3.00 s z3g-ph ln)nukcpo42q lx4kur,7vk 54?

  A bullet shot straight up returns to its starting point jfrnm/8 6i0 za6rnc9v in 7 s. What is the initiaj/ n c0696rnm8rf vzail speed of the bullet?

  A ball is thrown stra1e0* /ftv1 tto0jwczqight up with a speed of 36.0 m/s. How long does it take to retuf1cj*0 voz t/0t1qtwe rn to its starting point?

  A ball is thrown downward froma -qcy pb62kw* tzi-x- the top of a building with an initial speed of 12 m/s. It strikes the ground after 6.9 s. How high is the bakwcti- 6z*q- p2x-b yuilding?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numericap0m-, .esulezl value il0mz-p.esu , en the 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 ai( /b(bresnh d/;nk;uar with a speed of 26.6 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 8 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 8.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what iz,7*;y d okv vpd8c6hps the velocity at t = 1.0 s?

  In Fig. below, what is mt c;ex:h .af:the velocity at t = 2.5 s?

  In Fig. below, what is o4hp76 -yjd3jk v37an wl (elhthe velocity at t = 4.0 s?

  In Fig. below, what is the velocity at60lqk jpsd8c q8y4 pq4m vj(p4 t = 5.5 s?

  In Fig. below, what is the average veloci0ta bw;fx(iu q8 ;t6nfty from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to (r4u:+wo/g(oqso6n3 twp nsq6.0 s?

  In Fig. below, what is the n)er vcj7;lhl** *d :e t7elstacceleration at 1.0 s?

  In Fig. below, what is the accelerati g.fe if4*;ri ns9m(x8x/ncad48ujrzo iln-)on at 3.0 s?

  In Fig. below, what is the averoa w; 2eet1,a-l0o mqnage acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 tlb5 )rvc(5e) ;o xkvypo 8.0 s?

  In Fig. below, what is the displacemen u6xfoix7fvrjzqsla+m*/ h6 g m08x30t from 0 to 8.0 s?

Does a car speedometer measure sp0ktf p c.di mims2+y2( bd3sm.eed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity :lohvic2s1(y l7i;/vn jywj0 is constant.

  The velocity of an object can be negative when its acceleratiogvmtsv3b: (f)n is positive.

  If one object has a grof)o r4k2aq8ko7q/f kzp 0jp 1eater speed than a second object, the first must have a grf)7ro2kq kfo4 ao/1 jzp8pkq 0eater acceleration.

  Two cars emerge side by side from a tunnel. Car A is tra e1hay q6z.sl5lxod3 :veling 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 incre7unb 43pxk 0jzasing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into tho(u t.h3f5nut e air. It leaves the bat wiu 3.5uho(ttnfth 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,c9m m93l0q la1c ei8ky how does it change if ai3ke m a9cym cll1980iqr friction is ignored?

  As a freely falling object speeds up, what is happening to its acceljnl00+ fx 53hohwp4 g ,t)syazeration, how does it cha0,0gah5of4xsjpn wlyh+ 3t z)nge if air friction CAN NOT be ignored?

  An object that is thrown vertically upwardp.)nkcxx:xvy 4,gbk( will return to its original position with the same speed as it had initially if air res,x(4xn .cxvp) kkb y:gistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at t/ awbt:45 (ca+ z*+haxx rvvdmhe same time.

  An object can have nonzero velocity and zero acceleration at thejgr9*0 gp23 iv;q r,y(xaezgc same time.

  An elevator moving from the second floor to the fifth floor makir (sc;af)g /t64gj rvjng no stops along trct/ ) avgjgj;6srf( 4he way has zero acceleration all the time.

  A rolling ball moves frzzz)yeao.41*vtw c7a+o2b hw om $x_1=3.2 \mathrm{~cm}$ to $x_2=-8.2 \mathrm{~cm}$ 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 $t_1=-3.5 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=4.4 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight compuo+kh 7yw kc6-lete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.4 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 111 m awai6691 cec sxy;v f:hzsy in 13.7 s. It then turns abruptly ani;h:696 fczx seyscv 1d gallops halfway back in 4.8 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 fhq4 . cbml-osn.j1t;k(w m2 k$12 \; m/s$ to $22 \; m/s$ 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 from t ,llxb-u+yz3,t / app$21 \; m/s$ to rest in a distance of 73 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must rex5 0 3apa0xnucach a speed of $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.1 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks toznx , p3. gh qu)u mjm-803z:bnzwowa/ essentially top speed about h: 3mg) /m ouz830njzbq zn-pax.w,wu $11.1 \; m/s$ in the first 12.8 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 froma ozsk94nj .5j8)ur3z 4 y.)iqrri vla a speed of $15 \; m/s$ to rest in 4.35 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 0hesg+omumdq7 -9bu 4 the highway. Assuming a deceleration of9 mdgu7mhbeo+ 4-0suq $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going 7 znimi1l) ; /sjaoyogwes4- kum 5p2+$25 \; m/s$ 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 30.0 min. After ejcxme+a1a 3e**inj v4 xactly 27.0 min, there are still 1100 maie1x * j*+va3jcn me4 to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$