Suppose that an object travels from one point in s,4+z9 ;w uaiw nwr 2j zx)cejhs0sh;y8pace to another. Make a comparison between the displacement and s8y zw 4 cuzj,j;ae+hwi ;2)swnhxr0 9the distance traveled.

  When is the average velocity of an object equal to the instantaneous velocitvu82y2 yfuppcda/ :bym-*2 dyy?

  A new car manufacturer advertises that their cnu bly;.vly5gd.5m w;ar can go "from zero to sixty in 8 s". This is a desg u ;5wn;ylld5bvy.. mcription of

  An object moving in the +x axis exper(w+ g2zdh;9hltaly jzx* 8vv/iences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the Eastyo ip* cc413gn (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleratio3ic 4pny1g* con.

  Suppose that a car traveling to the West h -yk5+axe +px ytm)u6(-x direction) begins to slow down as it approaches a traffic lightxkh xayem+u56-+pt) y. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocityu k4s1m6.oy: r/ ocndl2q8 gdn. Make a statement concerning its acceleration. 81go4k.:6yscdmno n2qrul /d

  If the velocity of an object is zero, doesh95, n bucv:h j:vare;ph(rh. it mean that the acceleration is zero? Support your answer with an e,:5hvvuh(r 9prjh :cn ;bh.eaxample.

  Can an object's velocity change direction whc *7up8 mffhy 7 p-ebv)n.p6dden its acceleration is constant? Suvdu f*ppmecfd b)77y6hn- p.8pport your answer with an example.

  Suppose that an object is moving with constant acceleration. Make a stagfsl 0xig9 a0qmj /):xtement conce 0a0sxix) q/:mf9lggjrning its motion with respect to time.

  Can an object have increasing speed while its accel 6/rch 4ppqcfz* 4qc-ye sj,m4eration is decreasing? Support yo-6*sj/cc4mpq44p rzfh, eq ycur answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ick245e;ovsk u+ 6uoopz e. Make a statement concerning its acceleratioo o kku;24p6ozsuv+ 5en.

  Under what condition is average velocity eqc7c9yh*n p-ee/kcp )sual to the average of the object's initial and final velocity sy*7 -c)9chpc/ kneep?

  Objects A and B both start at rest. They both accelerate aqg1eb+7y gx,qiy j3 5dt the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of ,y g 71q3y xbgi5djq+eobject B?

  Objects A and B both start from rest. They both accelerate at the sameowm4:o+9 ty ze rate. However, object A accelerates for twice the time +et 4o y:ozmw9as 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 the absence of friction,bgei8vha+ q26- 2 znip which of the following is true concerning its motie -bni qv6ga22i+ pzh8on?

  When an object is released from rest and falls in the absence of fricq/20ufsfo z55cy.t)zvv uj:r tion, which of: vyr20cju/5ovtf us.z)zf 5q the following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the v-u, ctwmtpw 4x- s.y01+zse hfelocity and the acceler4c, + mf-ut-ptssx1why0.ew zation when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just before it .dkbe3,o.9rtfgt8lug7q x1 qreaches its highesqq9g1 gf.odtr8k7u.b t 3xe,lt point?

  Suppose a ball is thrown straighfcg/r:ub2 9, phx :rmku w,wqs)j,u(yt up, reaches a maximum height, then falls to its initial height. Make a statement about the di::9,uuuj wr,) (2 mxr/,qwphcs gbkyfrection of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches k dzoskk,t9x+2by70a9v pb)z a maximum height, then falls to its initial height. Make a statement about the direction o z zs2 b9,7 kvx9o0a+kkytp)bdf the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown do qfh1;.v4 4gtquixx39y om2e bwnward in the absence of air resistance. Make a statement concerning its 42xxfq9imqug1 ebv o3hy;.t4 acceleration.

  Suppose a skydiver jumps from a high-flying planlb is.+nl8h z/ds5ke7 e. What is her acceleration when she sh7 dl sh s/8ilzkne.+b5e reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical sen8wuo ;qafh9.x tw1 bc.3l m6acond ball is thrown upward with a speed 2v (twice as fast). What is the ratio of hwoq3lu89wn;1.mcaafb tx. 6 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 buhncva*qf+.4bxwk+4 ctmz .z16x8 f ylilding. One second later, ball B is dropped from the same building. As t8tc1+cqn4 vbwxf.6mf .k4a*h zx +lzyime progresses, the distance between them

  Ball A is dropped from the top of a building. One second.7k+h jq-yw+c aqf+gy later, ball B is dropped from the same building. As time progresses, the difference in cy-jaq.qkw ++hfg+ 7 ytheir speeds

  Two objects are thrown from the top of a tall building. One is thrown up, and 0(hwq )syzkt+ the other is thro+kz)thy(s0w qwn 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 bu,f xqvl x8zs:j *of3+x+fe*vg ilding. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations ofxsz3*oeq:l v,+jf8vx*xf+ gf the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. Tj 47mhwgyrs 0*)qve9 dhe position versusmjy09)*v 74 sgewqdr h time graph of this object is

  An object is moving with constant non-3 x 1 k/cqdrr/l7kd6oqzero acceleration in the +x axis. The position versus time graph of this objlor6 1qckxqdr7//k3 dect is

  An object is moving wityq0bk uig 9uu j ab,sg*n h*2c(h2ut1o-8y8weh constant non-zero velocity in the +x axis. The velocity versus timeg *tjnhq1uu 9kb-088uhyyci2goa (,u*e s w 2b graph of this object is

  An object is moving with constant non-zero acceleratiole0 f *qt /)x0s.axcu9fe bhx7v4ei*o n in the +x axis. The velocity versus time graph ofxe.f*l/o) h i9c*txa7vxsqe0 ube 40f this object is

  The slope of a position versus timxjvh/4yq 62 0w:ffebme graph gives

  The slope of a velocity versus time g3)zuga yh/+hc raph gives

  The area under a curv w04l9zmqj1qmyh-: zs+cy w)a oty4l(e in an acceleration versus time graph gives

  The area under a curve in a velocity versus time jz 7ow.jo0.1h6fo5q tzty 7zq graph gives

  If the position versus time graph of an objech:7k;4h+iim 6gl kgrdt is a horizontal line, the object ikrldg h:6 ikh4ig7m;+s

  If the position versus time grapj h/0t.leo7aqj(:c (g ge)brch of an object is a vertical line, the object is(eb7q ge/ l )otc0jh ar(cg.:j

  If the velocity versus tir y)jyxj/:2p gme graph of an object is a horizontal line, the object ispgxyj 2: r/jy)

  If the velocity versu wjw/6nb9bbw( s time graph of an object is a straight line making an angle of 30 degrees with the time axis, the object i(6ww/b 9 nwjbbs

  An object moves 15.0 m north and then 11.0 m f qcntug4: cl6k:o u39pj/pn5south. Find both the distance traveled and the magnitude of the displacem /p63qngtc kn 49 5uocpj:l:fuent vector.

  A boat can move at 30 km/h in still water. ip/ jdm09y p(u How long will it take to move 12 km upstriy(/ p9jmu p0deam in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1w /l8i v,on,ji mi = 1609 m)

  What must be your average sptxhd9gk969ec/puh;t e o8 p. ieed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours anh;yz sbb6ouyf11o*i ,d 57 min. What is the average speed of the runner in m/s?* ,6;booy1zf bihy1us

  A car travels 90 km/h. How long does it tazb;*lbv/j,pf;+ks t u+4iw yvke for it to travel 400 km?

  A ly (light year) is the distance that light travels in on mj2z:k4qbclz ehwg(71e:c6y 6rf.jt e year. The speed of ligh qjt6h :2g (b1kc: ee .y7zwmj64czfrlt 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 a/t;y y3svrng zzx-k2yrsbih1k/ v;;mx849v ilong a straight road and you look to the side for 4.0 s, how far do you trayxx9gvr t/k824s;k/yihb vmz;i 1 nsr-y3z;vvel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your averaf2t8ou-s c1i,nds q;bx md5m *ge v5ssnd-ubq1*t;mom8,ix f c2d elocity is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km e/tfsv/s j/ .t0v/ywc mast, then 1.0 km north, then 1.0 km west to return to its starting point. This trisj/./fm/tvc /0t vwsyp takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, t3fxt3yhes 5+1g1gg x nhen 1.0 km east, then 1.0 km north, then 11gg1 x+ftgsn35 e3hy x.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. d3vx ,pc-bw4m It then starts to mpd,3wvc4 bx-snow and you 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 100 km/h. What i2j qqzi.o2 ;+wlhj5k7 rjdul 9pe.0nps the average speed of+ro dphikj 0;5 9 .e2 27qjlz.junwlpq the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/hel+ ycu xhj3fr5 4.y5b+y;fuw and 2.0 h at 100 km/h. What is her average speed for f + u.xb; yh+ jl5f3cyyr5u4wethe trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h norttlewu 8/fh /7ch for 750 miles. What is the averaguc w 8tel7//hfe speed for the trip?

  In a 400-m relay race the anchorman (the person who runs tvm agcki a1;4-,g.w pzp;wqu2e/lxj1he last 100 m) for team A can run 100 m in 9.8 s. His ria1icg kvu4aw,w; gzxm qp e1-2p/jl;.val, 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 comes to a stop after dqt0y 1u0)taa 11 s. The car's average velocity during deceleration was 72 km/h. What was the qy)t dt aa100ucar's deceleration while slowing down?

  An airplane increases its speed from 10es*w0 /gt(tan: vq(u vn q:zm;,of6xr0 m/s to 160 m/s, at the average rate of est/wo,vq 6t:nzxfn;( q: mag v ru(*0$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ratecuir ukqo* b2d2m(830inhu h(0ap mp7 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 a9rr7j uze *4lfnd 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 speedsv6th5 :7/z3ltxnhb f z412 8lijxtnju up with a constant acceleration ltt4x85/h :b21z7njv6hf ziutlnx3 jof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of y8 v2rd7+*efcl pszn 22.8 m/s experiences a constant acceleration of pd+y7e n2zrl28cv f* s$3.1 \; m/s^2$. What is the cart's displacement during the first 8.9 s of its motion?

  A bullet moving horizontally to the right (+x direction) with ,.y2femo ) xbqa speed of 386 m/s strikes a sandbag and penetrates a distance o qx,y) ef.om2bf 57.88 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircri 3an8 zhl;sgchmwc;p3jt04q 3 u;;emaft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires gai;jcu 3083ze4q; lhc3; ht;pm swnm2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant v0.si:( gnfj*x yf6le 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 d*ky54qs1fmtv d m3 .z80 m/s in a distance of 200 m. What is its average accelerationdymq54v1zfk*3d tm.s?

  An object starts from rest and undergoes uniformrcuiu-( 9(q ebaywfe/3*fs v0 acceleration. During the first second it travels 8.2 m. How far w-s fca9yrq(/f( 3wu*bui e0ev ill it travel during the third second?

  An object is moving in a straight line with constant ac2kuo ;9l,g2 zk)z rcwxceleration. Initially it is traveling at 169gzl wz,; kurok)x22c 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 uniformlyy6 ucw, izbna8zjpwlm;):, ig4dy :b2 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 x6v +( aka9pbgbx) ewop20el9 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 lighqmlu)t z+vqb+4k 2 pk(t turns green, a car that has been waiting at the intersect2+qk z4(t lbqpk +u)vmion starts ahead with a constant acceleration of $2.00 \; m/s^2$. At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.
(a.) Calculate the time necessary for the car to reach the truck.    $s$ (only fill in numerical values)
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.    $m$ (only fill in numerical values)
(c.) Determine the speed of the car when it passes the truck.    $m/s$ (only fill in numerical values)

  An object is thrown upward with *:w4zis n4y7l 4lucdq a speed of 12 m/s on the surface of planet X where t*ld 4z sywcl4 qu47:inhe 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 sa;aeg0eoc7-54 a (dvtrgl 8nwpeed of 12 m/s on the surface of planet X where the w 5lg-ng ed0aeav 48rc7ao( t;acceleration 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 plan.o,k:t; jki saet X where the acce:.,;ojisk a tkleration 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 /lz +) vve/ayzwith a speed of 14 m/s on the surface of planet X where the acceleratio/yz)a+lv ve /zn 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 thacb r9c o n+4) nmid8j.)raiqx/n 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall beforbj )x n9rcq4o) m rn.c8/iai+de you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity)ol2:*mth p6 oae .tax after 3. he.* atox:6otlmp)a 200 s?

  A bullet shot straight up returns to its starting point in 14 s.p ,bit6w2po(thr(h:b What is the initial speed of, :bh(owtri 2p(b6pht the bullet?

  A ball is thrown straight u l+vts 1uui8p.p with a speed of 36.0 m/s. How long does it take to return to its staru8.1p ul+st viting point?

  A ball is thrown downward from the top of a building with an init(pu xek2)g5i 4f7zbxjbx+m3 hial speed of 14 m/s. It strikes the ground after 5.9 s. How hi xz5m3bb x7ufe2px h(+i4 gj)kgh is the building?

  A ball is thrown straight up with an. ejwxu +7p-a(qe c9r speed of 30 m/s. (only fill in numerical value7.9u p a-ewerc(+ nqjx in 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 aiz iz zi3r8d5j 4.uy/wir with a speed of 22.8 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 2 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 is the velocity aqh(q qs2afdkm*dunx) r :42,/ wqura*t t = 1.0 s?

  In Fig. below, what is the2s ohxviqr48n,) jl m6 velocity at t = 2.5 s?

  In Fig. below, what a)ahc w, kuaf,fflxt;4c g3ed96cx )3k,ck3his the velocity at t = 4.0 s?

  In Fig. below, what is the veloc /2sgy5qv9*wc 7jwyu lity at t = 5.5 s?

  In Fig. below, what is the 8ztzrk v5;xi*d wnuc,/2+rblaverage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocfar ua4d aqk9.v)w/3fity from 0 to 6.0 s?

  In Fig. below, what is the acceleration +j 0clf7ba byl +7rmcsii-8:qat 1.0 s?

  In Fig. below, what is thes7l7t 6u3d j(qi zculeky)2/nn-cpu4dxvz7 9 acceleration at 3.0 s?

  In Fig. below, what is the average acceleration fromprsd wlwm 2(x*8s7 fcdo;:yq0 0 to 5.0 s?

  In Fig. below, what is the average ae*i td;al8 f1jr: mv6zcceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0 m ub/9lt/uwdujt4 kha36;+py s?

Does a car speedometer measure speed, velocity? {speed|ve9 gjf:e5100l7/1xjo orlps fvvmd+tv locity}

  An object can have a varying speed if its velocity is constan69a cv;zgjl2 hw1e lo5am8io6h9) cnut.

  The velocity of an object can b:,-2m p; hte mybuz)f6. yltj9w)jes ce negative when its acceleration is positive.

  If one object has a greater speed than a second object, the firs26 iu emaaqgky4,+,, e ; yo5vcpx0tvkt must have a greater accelc2k0e5epq u gy4 yv;a+6m t,ixaokv,,eration.

  Two cars emerge side by side from a tunnel. Car A is t:/ nihhkivh6rv55 yqb f 7u7;nraveling 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 decreases.y8( r/t;c9q s(rmamd w

  A baseball player hits ay j 375ltwxz*dr-j/t j foul ball straight up into the air. It leaves the bat witlw y/3jr5dz t7 jtjx-*h 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, whafiths4c/ :*jc74 :n htt8t bsgt is happening to its acceleration, how do tt/chthn7b js:c*i sg8:tf4 4es it change if air friction is ignored?

  As a freely falling object speeds up, what is ha ov4s:u/olo 1dppening to its acceleration, how does it change if aiosdoo/1l4u:v r friction CAN NOT be ignored?

  An object that is thrown vertically upwa q d*2/iqavg1xrd will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result bi* gaq/q2dv1 xe altered?

  An object can have zero velocity an8r wj* m/4ukg;snxm -ud nonzero acceleration at the same time.

  An object can have nonzero velocityxabu 5rz3wt ts:e :vy)uh.;tp8x c+ ;h and zero acceleration at the same time.

  An elevator moving from tfn -qearcr59j.5d;fld6/pmd c8i dyp6/t ;q che second floor to the fifth floor making no stops along the wa6ftq-8ad5r;dp ;/ ynqlj i cecf9dcp. 5d/6mry has zero acceleration all the time.

  A rolling ball moves frtq0yi:/l4m) hbf;p2 kydlh/k om $x_1=3.2 \mathrm{~cm}$ to $x_2=-5.3 \mathrm{~cm}$ during the time from $t_1=3.0 \mathrm{~s}$ 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 $t_1=-2.1 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=3.8 \mathrm{~s}$ is at $x_2=8.0 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-mi+qmy,/sq uw-4: un f4y7wnuco le ($1 \; mile = 1609 \; m$) track in a total time of 10.3 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 101 m away r b7 )qip,+tsfin 10.9 s. It then turns abruptly and gallops halfway back in 4.5 s. Calculate (a) its average sp7psr ,fq)+b tieed  (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-tis9xu3f8unog wr:m 6v.gu1 $12 \; m/s$ to $22 \; m/s$ in 4.2 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 echsv0 ,:d7wf6( ljfzwhr6r q9sfk0: $19 \; m/s$ to rest in a distance of 64 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a sphl/o6x0ub j cu ;j*cl:p,c t/dxj) :areed of $31 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentiallkz e/cy14 yh/fg-; p 81ugfmg9m *gj d(g-vhqzy top speed abouq1k 1jyf mh9-4-c;yge(dg/fgz/pg* vhg 8z mu t $11.0 \; m/s$ in the first 13.6 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 2puc( en*o-yz5w a:aq zf 7t)wrfhn )4a speed of $18 \; m/s$ to rest in 5.16 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop,p 1 iz.*a8gynh a car leaves skid marks 92 m long on the highway. Assuming a deceleraan iy 8g.*ph1ztion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going dfd zngoqoko: 6tpl,w(.- tj 0g6ce(;$25 \; m/s$ 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 thy 2,lsb3jcnh6k v-f3 mflhlxyt 9*dgx9l/m; )an 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then kc;mv /3n l-x3h9yjlyxlfglbt)6fd * 2,m 9shaccelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$