Suppose that an object travels fm3jbfinw1 3v 1x1c)qf h7 :kijrom one point in space to another. Make a comparison between the displacement and the diswmb1x13j i:jhcn7q k1i v ff3)tance traveled.

  When is the average velocity of an object equal touy,fn7nst:3k3;9-t we4 yob*tw-h lq pek i1z the instantaneous velocity?

  A new car manufacturer advertises that their ca dn(q s r:(627fbsfxp-cfdk vy4d ,8zsr can go "from zero to sixty in 8 s". This is a descrip2zc :k 6dy48s- pfbvs(rfxnd(, 7s dqftion of

  An object moving in the +x axis expk46we, ,fligr, z-( wa+f3;zbj kyipneriences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x diretil v6n.( 9u bws:ujt vj.yw y*;u-(gqction) begins to slow down as it approaches a trj tg nw*vq(tusl.jby.6y:u- v9i; wu(affic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begineyk46kaj,s4 3v ; 1 o8cnjtfvps to slow down as it approaches a traffic light. Make a statement concerningne3jcsv1ky4 vaf6j4 , ok8t;p its acceleration.

  Suppose that an object is mz x +d7i2rngy1t8h;rqoving with a constant velocity. Make a statement concerning its acd;h qxitr+721gy 8z rnceleration.

  If the velocity of an object is zero, does it mean ,vbspay pq6w.a m6, 4gthat the acceleration is zero? Support your answer with an e w ppm.6 vy4gbq,s,aa6xample.

  Can an object's velocity change direction when its acce yg:y8u h+ufm opln-8:8dva la9 2vy2kleration is constant? Support your answer with an exa m8 l-akhnf2u:2v 88d ypyyo +lug9:avmple.

  Suppose that an object is moving withy+*g ngv*4zkq constant acceleration. Make a statement concernig* 4+n vy*qgzkng its motion with respect to time.

  Can an object have increasing speed t(fr-a0l +1llqrywy+while its acceleration is decreasing? Support your answey( rlyw- a+ l1+0fqrltr with an example.

  Suppose a can, after an initial kick, move ; 6vvll1+ybu6+-gblcr vnt0 zs up along a smooth hill of ice. Make a stanl6vb glvt1+6-rlvby +cu0z ;tement concerning its acceleration.

  Under what condition is average velocity equal to thczent x9ti.st(zegh9 d(v. ))e average of the object's initial and final ( 9e.zt ht(.9egvn)zc i d)sxtvelocity?

  Objects A and B both start at rest. They both accelerate at the same;7ib44tkg;m ckxyj 0u rate. However, object A accelerates for twice the time as object B. What is tb tk4g;j;0y4kum7x ic he final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same rate.d ze.j ,.m-bku However, object..mudkbze -, j 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 releasg6l uvzj7o/5aea*7l ded from rest and falls in the absence of friction, which of the following is true7*5l ug 7e zdaa/ljov6 concerning its motion?

  When an object is released from rest and falls in the abs1ta:a +m- rhjz/( +jg j+pcdqvence of friction, which of the following is true conceczjt vdj+ g h+r( q1/:aajm+-prning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velogqah e*y/s 7kp h0ux3a tjj9)(city and the acceleration when the ball reaches the hj) ek 0jax93u*s/qa7hpt h(gy ighest point.

  Suppose a ball is thrown straight up. What is its acc*du v wx8 -u6agcc1rw8eleration just before it reaches its highest c68auxw 8-wcdv1u r *gpoint?

  Suppose a ball is thrown strailrvwt rpl + *c2xh1d1*ght up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and +rt vpw *1l2xhcld r1*acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximuz95n1vdw97kp-coory-dc t /rm height, then falls to its initial height. Make a statement about the directiondw9kc 5ndt/o-o9v-ry z p1cr7 of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown dog;w/dp pj;t (dwnward in the absence of air resistance. Make a statement c;(djdpt/ wgp; oncerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleratg68 phjnu 4w:wohl,4 s-ho *scion when she she reaches terminal veloci:wssn-o6h ph,4 4wh *gjl oc8uty?

  A ball is thrown vertically upwardm:z4tc (9yhhwt:4rxb;y.l- s :tcse o with a speed v. An identical second ball is thrown upward with a speed 2v (tb-y:ot slhyw9:rmh4 ; :t(e cs.zcxt4wice 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 ball?)

  Ball A is dropped from the top of a building. One second late ++5eng0l1:eb dyf .en3xfunyr, ball B is dropped fr. 5yyu nl:d ngbe ++30fxfeen1om the same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, bal7c9g5 dxx59ttes)h d yl B is dropped from the same bue d75 x5s9x9)hcttdy gilding. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown z,g tcbd9llu8:v z2zf.er)*o up, and the oth2:reozfz .t8d )l9v b*zc,lu ger is thrown down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped fkbxe 3t4*fu2pdo. xb1 rom the top of a building. A second brick is thrown straight down ko 4*tx1. 2dpub3bfxefrom 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 axis9:b+x o+csbgy . The position versus time graph of this o+ so9:b cby+gxbject is

  An object is moving with constant non-zero acceleration in the +x axis. T j- pw93 ivh+nsm-ujoe4v8/s yhe position versus time graph of this object i+wi-v 4-ys j8ejo9n/mp3h usv s

  An object is moving with constant non-zero velocity in the +x axis.ccgqn;w v)xe,l+b6nto 3* fp4 The velocity versus time graph of thise ;tl*3n xn,oc +qv46pbgfwc) object is

  An object is moving with constant non-zero zc bh;od/ rhw 8 kgwm,kj*kus68q6)2bacceleration in the +x axis. The velocity versus time graph ofur,ck6jd; k)mwb/2b6hh8 qkg8 zw s*o this object is

  The slope of a position verrtq puqs3tw7ygd/7 r 4 nftx01/.gkp.-nwuc ,sus time graph gives

  The slope of a velocity versus time graph gix ghy.5 zyws9c -9qe:*rhg ,cnves

  The area under a curve in an acceleratiar - 0fprdp3d5f) byt(on versus time graph gives

  The area under a curve in a velocit+j5e7xjhp 5u nwpvs b,mw)t91y versus time graph gives

  If the position versus timefr) ./lft ug1d graph of an object is a horizontal line, the object isfg rtdf. u1/l)

  If the position versus time graph of an object is a vertical line, the obje0 x/ lbb9*u*jtd jyav a(c3ng7ct is9 y(c3 n0lb vd*jgja/bu7tax*

  If the velocity versus time graph of an object is a horizontal line, the object 2+41wra;j di hrvw2xx itrp *2 d*r2irixj4wv2 1 xwtph;2a+ ris

  If the velocity versus time graph o yo1-wnl wvjowkrec1+j gg s3n 2p+9:7f an object is a straight line making an angle of 30 degrees with the timeng g2c1- kply :s9v nwwj3w+1orj e+7o axis, the object is

  An object moves 15.0 m north ando/9dtte.ziy) o l lm+j419xed then 11.0 m south. Find both the distance traveled and the magnituzoe1 y 9 t d4ed)+xlljmo9.i/tde of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to move 12 km 28ap; jc-pkzfupstream in a river flowing 6 2a8 p-z;jkpcf.0 km/h?

  55 mi/h is how many m/s? (1 mi =k;n66nmx kwfp g ,yjxa)3zs39 1609 m)

  What must be your average speed in ordbn qesp- g*nl-+bfmn: lzu9(: er to travel 350 km in 5.15 h?

  A runner ran the marathon (approximm3+ 13jds5c- mqurjp il1nrx+ately 42.0 km) in 2 hours and 57 min. What is the average speed of the rucj q-dl3n5 rxujp1r13+ smm +inner in m/s?

  A car travels 90 km/h. How long does it takmmmw z4 ucf:s7w 44q:ue for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. The spmn5f n g0imo)9eed of lmnfmn) o9g5i0ight 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 fo,y+:um v (,o*gz;yjux n9qd zur 4.0 s, how far do you travel jo v*:u,q+ g(9, ;yduzxmunzyduring this inattentive period?

  If you run a complete loop arbz ,7. sc5oibjound an outdoor track (400 m), in 100 s, your average velo.js,b 7bi 5czocity is

  A polar bear starts at the Norta61jt );gzhqs h 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. This trip takes 45 min. What was the bear's average speedj6th1;z)sgaq ?

  A polar bear starts at the Norf*,+yu,nlydgsb n xs.(f 1d,yth Pole. It travels 1.0 km south, then 1.0 km east, tn(snxfd+y*bu1yf, gd ,., s lyhen 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 average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. It hkk p(wh,4hvc w p-z13then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. Hokzvw,1hcw kp 3 (h4p-hw far is your hometown from school?

  A motorist travels 160 km r s wok7+c7si21,yuikm15cm b at 80 km/h and 160 km at 100 km/h. What is the average speed of th 2w o1r+usicmykk71ism ,c5b 7e motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is hwba j-m xmu);ni;.zg 9er averageijxwgu. ;ma-b 9 mzn); speed for the trip?

  An airplane travels atx-4gv vg1;yo9ba-b xq 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the trip-o1x4b;gab9 yx vv -qg?

  In a 400-m relay race the anchorman (the person who r0 vy9h50hu :k/fiif:nx (jmqpuns the last 100 m) for team A can run 100 m in 9.8 s. ni59j0kp0 myqf :/( hif hxvu: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 final leg of the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and coxsmsayz)o0 g f,q3m k/2k3x-mmes to a stop after 8 s. The car's average velocity during deceleration was 52 km/h. What was the car's deceleratiox3f02-asm y)k,mgz s3 /kxomq n while slowing down?

  An airplane increases its speed from 100 omy/f pwl22jm;sf*o v+:qrr/m/s to 160 m/s, at the average rate of or /+mlsrfo2 jmvfwy:2; pq*/$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate o5y*,bvlrywc + / cyh4vf $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and accelerates at-i0 eiw nomg5k*4 m:wq $4.0 \; m/s^2$ 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 constmo/vbapnj 9x 1/yfkv y .( s6i6)akq9hant acceleration ofsv/xo16n( /9 jamh qf9vpyy kk6b i.)a $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 5.8 m/8x5aav t7 pz/qs experiences a constant acceleration of/8paz 7t 5xvqa $1.7 \; m/s^2$. What is the cart's displacement during the first 8.1 s of its motion?

  A bullet moving horizontally ta1 . 5y5u5ot2iuhspf qt.0 xzyo the right (+x direction) with a speed of 532 m/suf5q2 0phyi5 a .5tuztyxo. s1 strikes a sandbag and penetrates a distance of 95.06 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is lamnq39 ao;iww3mlb *3pw nx;+f unched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and thisw+ lx3 qmwfma3;pon9nib; *3w requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with)ogzxs)*y6 r 0s+oq3k -n b eyml,0qxi 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 mdmvc e we9bh t5/kz 2-5e8*ugh/s to 80 m/s in a distance of 200 m. What is its average accu*bh/hm25-etcdze9 ve gk5 w 8eleration?

  An object starts from rest and undergoes uniform accel*:hdubgq0dpcv 0 ;)alsn4dfoy+0 ak8 (fk-kderation. During the first second it travels 9.5 m. How far wiulha+pg-0o(ba dk*y;v f0 c8qsk40dnd:) fkdll it travel during the third second?

  An object is moving in a straight line wdwf o)r+b9o j+(/r2zw-r vlgo ith constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/srb + dv(z l/ow9r)grf2ow-+o j. How far does it move during this time?

  A car starts from rest and accelerates unif /n96fbc3js6 sxio;yiormly 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 deceleratozpv-d (eigip 692w 1oe at about $5.0 \; m/s^2$ when braking. Suppose a car is initially traveling at 55 mi/h.
(a.) How much time does it take the car to stop?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ ((only input numerical values)

  At the instant a traffic light turns green, a car that has been waiting at thebddf i49jc /ndgoqi:;6:n1br o dyt:- intersection starts ahead with a cons /g1j6:nyqot9-b :did4 cdon:fbr ;i dtant 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 on the sur pi 9jx.9nb8hyface of planet X where the acceler99xipnh .j 8byation due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown up2ip jr/z s07haward with a speed of 12 m/s on the surface of planet X where the acr7pjh 0sia/z2 celeration 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 o/)d 3c ennkl:uc4dnd 9tua/y-f 15 m/s on the surface of planet X where the acceleration ny : ntkdu3eal9 n/-d)u d4/ccdue 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 upwardn. yt6c;w he*ee2bi ig 31c0uf with a speed of 14 m/s on the surface of planet X where the acceleration due to gravity is; 10biug e.w*3he 2eintccy6 f $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10 uw dzc3a ub3c*jq8*l:q3u9fos. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch i3 uq8cdjuqo *:9zlc3 uw fba3*t?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocityd tuvo4.h ryf4( pc:i2 after 3.00(h2rfd yocitvp44u.: s?

  A bullet shot straight up returns to*; cd(ua,4ngt +cbvkg y3q2iw its starting point in 5 s. What is the initial speed of the b dc2gk( qvna i4g wcb+y;3*tu,ullet?

  A ball is thrown straight up with a uu-z g:eswo pq66lj)x q/n ;s4speed of 36.0 m/s. How long does it take to retu;)x: wjun4qz6/pqlu e 6 so-sgrn to its starting point?

  A ball is thrown downward from the top of a building wk6xqq 8vn5.45z pr fzf*clfo6 ith an initial speed of 21 m/s. Izo5 p5vx qn46*c r.f8zqflfk6t strikes the ground after 1.5 s. How high is the building?

  A ball is thrown straight up with a e:k3,my ioe(: qxqifaj 4)6kxspeed of 30 m/s. (only fill in numerical value in the blankx(a eq,fyi o346eikk :mx q:j)s)
(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 43.8 m/s.t:d3 lp9f s5xd (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 15 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 15.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity(h;r0cw:n*e u .a43c v3ox ztu 9sihel jr9cv) at t = 1.0 s?

  In Fig. below, what is the velocity at t = 2x jgz8o/pwaf5 pbw60 ,.5 s?

  In Fig. below, what is the pf x./4 suq9lgvelocity at t = 4.0 s?

  In Fig. below, what is the velocity ah g0qyf2q.pi 1t t = 5.5 s?

  In Fig. below, what is the average vwsy*q-+ese z 5elocity from 0 to 4.0 s?

  In Fig. below, what x.p/0d6hc 7onfwh 8rv is the average velocity from 0 to 6.0 s?

  In Fig. below, what il0pgs4-17 am jh k/u5+pc j)y uvmjpr0nrc5z1s the acceleration at 1.0 s?

  In Fig. below, what is the acceleratiojctx3vgbil7f 8q4(9y n at 3.0 s?

  In Fig. below, what is the average accelerati9e w lsi,hy +3gxwe.i5on from 0 to 5.0 s?

  In Fig. below, what is the average accjs4ip4o6 inir -3n (gefh0i-heleration from 0 to 8.0 s?

  In Fig. below, what is jbq0-wda.hb0 wet 4) sthe displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed| +-mhf;4hokvsm7 *z8odpq zi-velocity}

  An object can have a varying speed if its v fbstd+(p ,mm7 n.9jhbelocity is constant.

  The velocity of an object can be negativev u*5.d mltiwu7qv2(p when its acceleration is positive.

  If one object has a greater speedw yu0;g2+lq pn than a second object, the first must have a greunw2q g 0y+;plater acceleration.

  Two cars emerge side by side from a tunnel. Car A is travelbn0l)+vcl qpt; kq *qp/3na4qing 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 accel (l 01sdcosc.ueration decreases.

  A baseball player hits a foul ball straight up into the 8zgi*y .k vgi8air. It leaves the bat with a spee.*ivgi g 8y8kzd 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 iszv*ind :-ruky7p/;bvwxj2y(m9t4w s happening to its acceleration, how does it change if air friction is igi w*7 vd2z9tmn wkj;sxy(-:/b p uvr4ynored?

  As a freely falling object s8p,r ;bo uxysw /e+v: /r0kfmupeeds up, what is happening to its acceleration, how does it change if air friction CAN NOT be ignored 0vr:s/wuoryp ; /+bf, mek8xu?

  An object that is thrown vertically upward will return to its original pous (y 57ev.ely0lcd 2c):fwzpsition with the same speed as it had initially if air resistance is negligible. If air resistance isll(pwf.)cyc05yeuvs ze7 :2d appreciable, how will this result be altered?

  An object can have zero veyf wef/4 d4g,elocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at tf(q7( 8goeg q c+tz ,v,g(v.cs8p ufoohe same time.

  An elevator moving fr2xt(cgrd6c1r6 kn we5om the second floor to the fifth floor making no stops along the way has zero acceleration all the 6t6w(cnr r k1dxec2 5gtime.

  A rolling ball moves from tbzjrjay;q1 q-r 60gwa(gx;: $x_1=3.3 \mathrm{~cm}$ to $x_2=-8.5 \mathrm{~cm}$ during the time from $t_1=1.2 \mathrm{~s}$ to $t_2=5.8 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.7 \mathrm{~s}$ is at $x_1=3.2 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complet5 ulrr3(u4qqi9t f5 dme laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.5 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its t)wf k-zsz,d :ozqsiz;9t4a0 n rainer in a straight line, moving 108 m away in 10.0 s. It then turns abruptly and gallops halfway back in 4.7 tsz,0z9wz;fa-:kns)z iq4do 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 fryhsglf7 lxv. hq*-;7pom $13 \; m/s$ to $25 \; m/s$ 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 fromy /0dx5gncuy - $20 \; m/s$ to rest in a distance of 66 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of g1eih,*zup * bx5uf4p $26 \; m/s$ 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 the blocks to essentially top speed asfqxg (xbqs j84z0m, 7bout g7,bfxs8 ( sjmz4q q0x$10.4 \; m/s$ in the first 11.1 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 s1yl8lw4qhw 8((y 9 xuo:n4diw id3 dzhpeed of $17 \; m/s$ to rest in 5.92 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 onjlh 6ar4g;6 ap the highway. Assuming a decele6raphl;4 6agjration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck gouv+n:;c lwrq hyy h1anv2kf- 2v+ 9i*fing $25 \; m/s$ 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 3h758mwqs*a85nh7g j( xf rr.j2pjz sb0.0 min. After exactly 27 5gsr f aj(7rs2 .xjhb*p88zmhwqn j57.0 min, there 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?    $s$