Suppose that an object travels from one point in space to anothe.o dpx-wxr:4:dygt p1 r. Make a comparison between the displacement and the distance4gd o yx1: rp:p.xtw-d traveled.

  When is the average velocity of an object equal to the instantaneous veloci 4paje ;;1 t :xzb5hi2r4a6 esshtv)jxty?

  A new car manufacturer advertises that tv . ,eyj5qa8pkheir car can go "from zero to sixty in 8 s". This q8,pj v.ea5ky is a description of

  An object moving in thll4i)7bpi9 tt1/r. mjt6v v cre u86lve +x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins turi qdjb49(sh .:ewy2o slow down as it approaches a traffic light. Make a statement concerning its accqji(rse yw4:u 2bhd9 .eleration.

  Suppose that a car traveling ttigvv-uwu +:b ) s92doo the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concew) utous+9gvib-2 : vdrning its acceleration.

  Suppose that an object is mov zyzp.d59*kyoa p);bving with a constant velocity. Make a statement concerop5*a p9y z.yz);k vbdning its acceleration.

  If the velocity of an obj76 d15bmdkta2yk*fhtq1; wzj.i3kxj wp 2u e1ect is zero, does it mean that the acceleration is zero? Support your answmzw76tk yk5t1 j*k 1 bx12.i e3ujqddh ;p2awfer with an example.

  Can an object's velocity change direction when itx ytxrfms21w d(mn*18 riks sh716r;os acceleration is constant? Support your answer with an exaor*wsm 8i;f2msrtkh1 y 6 ds(x7rnx11mple.

  Suppose that an object is moving with consta ctmu ;og*5si+ hh9efl1 r63,fpr3 oount acceleration. Make a statement concerning its motion with re1oh9 , rpu3o c mhfrfs5;6gl*oeu +3tispect to time.

  Can an object have increasing speed while its acceleratioax 94pb ts0)qcg z /zi23ro:ltn is decreasing? Support your answer wgt49i:x/a czp)b 0oq z3s r2ltith an example.

  Suppose a can, after an 8ms)w 1ij9x-4)rz3(yftc)hemss/eb3 qm n xk initial kick, moves up along a smooth hill of ice. Make a statemenxq 1(s/s)e3 3rz hm f)xnb9ymcmk4si -t)we j8t concerning its acceleration.

  Under what condition is average velocity equal to the averd 8m-66hn.:d cv *m pyzhanb4cage of the object's initial and final velocitymc46-.ynvpn: 6dm *b8czhdha?

  Objects A and B both start at rest. They both accela 89xou5ta fz z6+m)veerate at the same rate. However, object A accelerates for twice the time as object B. 6t 58+ueazfv9)mxoza What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both f1-iy*) lcb7m6qx, fd k6fz imaccelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled byqc m6-bz1lf,d m6*i xyfifk7) object A compared to that of object B?

  When an object is released from rest and falls in the absence of friction, which;nhry*.rv 6hio/jyn7 of the h*hy v ;. rnn7joi6ry/following is true concerning its motion?

  When an object is released from rest and x- mqe; gfr;p6falls in the absence of friction, which of the following is treqmf6; rx gp;-ue concerning its motion?

  Suppose a ball is thrown stx*5qlmxt ,0;qruqu 9 xraight up. Make a statement about the velocity and the acceleration when the ball reaches theu* q,l9x;5xxmqur t q0 highest point.

  Suppose a ball is thrown straight up. What is its.hbzd-u3x4r v acceleration just before it reaches its highest poinz 4bd hv-3rxu.t?

  Suppose a ball is thrown straigo lgff-r7q eg)i11+bcht up, reaches a maximum height, then falls to its initial height. Make a statement about the direcg-e7i f )qg+b11rfo lction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to it -0olu3nk2f tt8mz 7 kidems3*s initial height. Make a statememekn3st8*z0f2od kl-u 73m t int about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make a4un jm9ecsa v i2p(- sa825swrhg):oa statement concerning its acceleration )vims82hune4r(ps-2o c 5 gaa: saj9w.

  Suppose a skydiver jumps from a,ix0qxd-w2eh2. (nyppzsa 6 ;-s ueyy high-flying plane. What is her acceleration when shea (xyy -i- pwhzqs p.x20;,dn2seyue 6 she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. k +(yn;djzev4 An identical 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 first baed ;4+ jnzyv(kll?)

  Ball A is dropped from the top of a bungnb2,1i9q xj87si adjt 0dl 7:sz r+w0d t.fwilding. One second later, ball B is dropped from the same building. As tir1w 97jnn fi:0xs +7tiq0sgd 8,l dbd.2zjtawme progresses, the distance between them

  Ball A is dropped from the top of a buildn 3so8 /+nywzfing. One second later, ball B is dropped from the same build /3+ofwy8nn szing. As time progresses, the difference in their speeds

  Two objects are thrown,)bvrvuhhs 3 pl3m1qab-g/zls ,f, p2 from the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when theyl3pu q 3,,b 2r a) p-f1mgbvh/hzss,vl hit the street?

  A brick is dropped from the top of a builduu doc5xg+cyk 9 5 .m71+hznwfing. A second brick is thrown straightodwk+.155hc7+gxu uzfny 9cm down from the same building. 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 velocity in the +x axis. T:,x+8 j cpekeahe position versus time graph of this object icj + axep,k8e:s

  An object is moving with constant non-zero acceleration fm4s fnkfdohs-k;1/0in the +x axis. The posi/- 0m1k4ofhfnss;kdf tion versus time graph of this object is

  An object is moving with constant non-zero velocity in the ;yzii):i8a 0c+;u a/bs.jqqvz2i fcr+x axis. The velocity versus time graph of thiszq /zaa.isju8)c ;iic+iq ;2fy :br0v object is

  An object is moving with constaw tra cq8;j: q 5/eldh1a6k;odnt non-zero acceleration in the +x axis. The velocity versus time graph a;r/ klt qq1a5ded 6ch:;8j owof this object is

  The slope of a position versus time g7liby 8wh.40da/bq rynh 1k0yraph gives

  The slope of a velocity versus time graph giz7 +5jskx6v;k.0kck +f myo ixves

  The area under a curve in an acceleration versus gy84gt e0*x bvtime graph gives

  The area under a curhlm.(wdxs) v4 ve in a velocity versus time graph gives

  If the position versus time graph of an object is a horvtif+6y4a xt wh,0kb3izontal line, the object is htf+wit6y 3vb0,x4ak

  If the position versus time graph of an object im 14tcpfl , t)/yaa-xg x1rg(ns a vertical line, the object ist1f1p, a)aymrx xg-ct ln4/g(

  If the velocity versus time graph of an object is a horizontal line, the objsp(ir9ivm,mm:bz, )k ect is(m ,)pvbmmi i,9skzr:

  If the velocity versus time graph of an object is a straigh,2) a*ydqwl7obqk ,dk3rto7 it line making an angld 77)3a d,yoowri,lk q*b qkt2e of 30 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m sout o;/ :mzh /t8ljxbf d8zv.bjy ,bn;/pbh. Find both the distance traveled and the mayn 8/ ;d:bxvp.o/ z mzbj ;h/,j8ltbbfgnitude of the displacement vector.

  A boat can move at 30 km/h in still water. Hovn /ejl hm,ce8n:faf ap h36)3w long will it take to move 12 km upstream in a river flowing 6.nc,af38 a n jhh:m6vp )e/e3fl0 km/h?

  55 mi/h is how many m/s? (1 mi = 16 z(horg 92p,3- wxqdjsrzxw-209 m)

  What must be your avebbdap7 87;jqtrage speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hour t1sy6;m3 fx3oz myhd 01hc*yds and 57 min. What is the average speed of the runner in m/sh1t m*y;z6x103soyfd 3hc md y?

  A car travels 90 km/h. How lonnbman .(3:xg og does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one mwqrr :w83bhqh 4to i.24b)p fyear. The speed of lighb ib42h whmw38)t.o: qr4rfpqt 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 and you look to the side foepu0 q*pxwr ,5r 4.0 s, how far do you travel during this inattentive periep,u*pq0xw5 r od?

  If you run a complete loop around an outdoor track (400 m), in 1 ,ostev234aw sq1 wj,rwobg1 400 s, your average velo gts2wqa4 v11o ,wro4j3,wsbecity is

  A polar bear starts at the North Poqe-jlj4a9qwsq u5, ny)l9 dz8le. 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. Thi nqq-l8 ewa q4zy95slj9ju) d,s trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km so8 qlu g(nih.b+fo y08cuth, 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 cluy.qih8 (o0 g+fnb 8the bear's average velocity?

  You are driving home on a weekend from kk9vijrdll;/5*lxr/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 frkr xklijd lvr/9/5 l;*om school?

  A motorist travels 1606b rn u9zw4;y b.x-tdk km at 80 km/h and 160 km at 100 km/h. What is the average speedbr-u4w9dk zx. 6; bnty of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100-0kzrr 8n i gjqpdms1;d044 xm km/h. What is her average speed for the tr1i;mx4mdjpk d 48zrgq0 - 0snrip?

  An airplane travels at 300 mi/h south for 2.00 h eatwlr4rh v6d99 rg *pgy,h0*and then at 250 mi/h north for 750 miles. What is the average speed for 4ph9 9vr*0rlg e hd6yw t*,rgathe trip?

  In a 400-m relay race the anchorman (the person who runs the last + df9:xl )ra thwpz:p5100 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 starts the fina5) lhf:zp9apdw+r: txl leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly9jugrm . oy/h+ and comes to a stop after 10 s. The car's average velocity during deceleration was 66 km/h. hym. j ug/o9r+ What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the aveaz00rcgjd9s. rage rate of gc z0ra0sd9 j.$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ratevqdk b)4q76,) ll/)zgmgndpm 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 o32h: q)wlr.2dg0v/pco qjde 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 2r9q. 4opl 0ywnvv r -pa,ld;ospeeds up with a constant acceleration o.,ldyl v4or qva pn;wo2- 0pr9f $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 5.6sh)h99nq-g4ax 6ngiu m/s experiences a constant acceleration o)s ia6g9 unnhh9g4- xqf $2.9 \; m/s^2$. What is the cart's displacement during the first 8.5 s of its motion?

  A bullet moving horizontally to the right (+x direction) wmhw+/bhv;w4luvv rp u*; im ;t05kg,mith a speed of 408 m/s strikes a sandbag and penetrates a distance of 16.57 cm. What is the average acceleration, ing; i0thwv,l*;vp5/b rwku;mmh vm u4+ $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on aj41rt zrtkqk0*t me8.uo3 s+fn aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catap .1kjfo* t8suq e r3+t0mktz4rult?

  A car starting from rest moves withe3dhbu ( 8ezj4 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/s in a distance fursn1,9ta wn8* oqw5of 200 m. What is its average accelso1nawwrq *u 895,ftneration?

  An object starts from rest and undergoes uniform accelerationoz*b ,l- ft 2go-8 3bwndvan+b. During the first second it travels 8.7 m. How far will it travel g+,-no v3 wl8* tabbz2ofnd b-during the third second?

  An object is moving in a straigls i8j)v1 sg*x-jdc0;e okebh0j 8.mdht line with constant acceleration. Initially it1)ldejgk;8o-0 8dsej b.vjm*xh ics0 is traveling at 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 accelerates uniformly at ugybt 7zjqy: 8/7wy 3k$3.0 \; m/s^2$. 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 kc+th vkk.0 w6tep)+ ua dry road can decelerate at about $5.0 \; m/s^2$ when braking. Suppose a car is initially traveling at 55 mi/h.
(a.) How much time does it take the car to stop?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ ((only input numerical values)

  At the instant a traffic light turns green, a car that has been jg-vwy;h 2nw9, 5zt1d/cyofswaiting at the intersection starts ahead with a coyv-t z;9j21scfndw/who,5 gynstant 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 with a speed of 12 m/s olfpb* +e p/,yvsyh(f7 n the surface of planet X where the (,fpe7/pflsyv*bh+y 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 surface of xc/otqg iqikml5/j8. r+1 z2cplanet X where the acceleration due to r8jt lqzx / c/c1m2o +qki5.gigravity 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 a;ljk3k*j m*kayrexktns+( 6k0 z-( k15 m/s on the surface of planet X where the accelerk ;t*ea*6aj(jk0 k z +kly-r3kksmx(nation 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 upwa3 -8vs dkj. r6hfm+qvlkp:km+1esc f:rd with a speed of 14 m/s on the surface of planet X where the accelel1r.vkm+ f q3p:m skjfhsvkd6c: +e8-ration due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10 s. If your fxdi j s./7n /9n9qx4uet7fl; f;lkwlvriend holds a ruler between you fl/ fnq; kiwl/t94e9dxsv. u7 xjn7;lr fingers and releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 s7 d tz3jxlc9bq sb. x6*,pea+m/s. What is its velocity after 3.00d3.,tze * asqs b b+j9lcxpx76 s?

  A bullet shot straight up returns to its starting point in 1q 8irnr /(fyvm6/qov:k s( qu6 s. What is the initial speed o:y16 8m u nsq(q/iqvror /(fvkf the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it take tuvc9 )gq 1 n2vi:83edi2tvzvcoi1vv q ie8vtvu2n:9cg2 cd3)z return to its starting point?

  A ball is thrown downwa68sv+v+c cr: kqy ;r3heg li3frd from the top of a building with an initial speed of 12 m/s. It strikes the ground after 4.1 sl6r c q 8vy+ch esk;irg3f3+:v. How high is the building?

  A ball is thrown straight up with akm3e-)5tw fe ak- ro)w speed of 30 m/s. (only fill in numerical value inekk)-moaf e5wwt) 3-r 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 h1fc 9-icl ,iby 2zgq)air with a speed of 22.7 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 14 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 14.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what i )n-eiuel +d9rs the velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t = 2.5 3u1yx.g)sv ddn2 pmmo ) :)aias?

  In Fig. below, what is the veloyzi- xg9c4/ac-sv s ,ocity at t = 4.0 s?

  In Fig. below, what is the veloc 7o.3rb,pjgfu ps o2l8ity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to z1jl8 t :0t-abiz g:8 cafk4ap4.0 s?

  In Fig. below, what is the average velocit . dw( /;a9vshc/hps)hr.5b fcxj1ox by from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 l3(jolm+ji ,f s?

  In Fig. below, what is the/-z fvdg4 xp(lkwup*v3; c1uj acceleration at 3.0 s?

  In Fig. below, what is the average acceleration fro4f*q 3ml tw)q767 vysx lsdu-um 0 to 5.0 s?

  In Fig. below, what is the average acceleration fr,0gnefwr5g, n om 0 to 8.0 s?

  In Fig. below, what iepguh ) bwg1lxxo/-yx 1 y*l+6s the displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? kd.-s*g8u)zqagxb4 n {speed|velocity}

  An object can have a varying spz9y fhz 3.1wrjeed if its velocity is constant.

  The velocity of an object can be negative when its accelev2 kzs/8gc 1ezration is positive.

  If one object has a greater speed )zu jjuvu. e4ir qq,o(ts,,ugy uj3(9than a second object, the first must have a greater accelje).vtuz jguoqs,9u(,uyr(, qj 3u4ieration.

  Two cars emerge side by sided0 j7e+/gjwcou2 syn: 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 gw 4zme0b7ip/jywt5 ,acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves thew)7y1,v/is drtuio8.5 ximto bat with d w51,oxityovti7 ur i/s.m8)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 spq j8;1i quvbfjdqkx44 )2z8iyeeds up, what is happening to its acceleration, how does it change if air j vf88 qy; z 1qqkiudx2ji4b)4friction is ignored?

  As a freely falling object jimq*pf l:tvkxj:3v n53- gq5 speeds up, what is happening to its acceleration, how d:qkqv-x3jjlg :5iv* m3f5pn t oes it change if air friction CAN NOT be ignored?

  An object that is thrown verticallycq k0pq v0y- ml;5i)yuze rd66 upward will return to its original position with the same speed as it had initially ifq)ce 6kylmqyip-0rz0 6d5u v; air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero v9yo; 9plcxp8m pomk,zu4 .p9 delocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero aze4ud ..*j2oldi .*zu k9 wejscceleration at the same time.

  An elevator moving from the second floor to the fifth floor making adn41i )5/5)dcp wfgn nn, bhkno stops along the way has zeron ,dkw1 cn5fa5h nn )4idg)/bp acceleration all the time.

  A rolling ball moves uuh+k 8..(8ei nsbukrfrom $x_1=2.1 \mathrm{~cm}$ to $x_2=-5.8 \mathrm{~cm}$ during the time from $t_1=1.9 \mathrm{~s}$ to $t_2=5.6 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.0 \mathrm{~s}$ is at $x_1=3.1 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight coe dw)-8vqqr8 amplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.5 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, moviniuta8.*e 4u tag 110 m away in 9.6 s. It then turns abruptly and gallops halfuat 4ai u*te.8way back in 4.7 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 fr 6i6bpt*y/e pzom $12 \; m/s$ to $22 \; m/s$ in 4.0 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 2 ;en( rojyszcbt*2t/$22 \; m/s$ 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 speed of xuhj )dpz.+ ewd1/6nz$30 \; m/s$ 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 burst out of thecu a ;q9dzmmi0tj8.)n blocks to essentially top speed aboutm0. )9cdzqiat;j mn8u $11.3 \; m/s$ in the first 14.7 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 unifor0cfdnct em0b60bg4d, i wv7upw 6y/ -hmly from a speed of $19 \; m/s$ to rest in 4.19 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid mar-ws-s)p byv yqg63i/e ks 92 m long on the highway. Assuming a decelerwvyqi--/)gyss e 3 6bpation of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tr. v t3bwkhb ebd9w,5i3uck 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 than 30.0 min. After exactlykaf4 c(r zm22pbq2if*)cep .a 27.0 min, there are still 1100 m to go. The runner must taf4q2 cf)ie.2 2(rz* p mbacpkhen accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$