Suppose that an object travels from one point in space to anotwy /gniyike*( x * :1e27xjgtkher. Make a comparison between iy7 x*:xj1/ itg(e kwgyke2*nthe displacement and the distance traveled.

  When is the average velocity of an object equal to th1v wxxmk(r 5*de instantaneous velocity?

  A new car manufacturer advertises that their car can go "from z8byeg86 mspx8(. pbym ero to sixty in 8 s". This is a ey.b8p88( msmb xgy6pdescription of

  An object moving in the +x axis experiences an acceleratj p8sis g)s1g7ion 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 ah5ow5 rr3b mo0s it approaches a traffic light. 3o 50bw rm5hroMake a statement concerning its acceleration.

  Suppose that a car travel, 8wb1v ybic6p6s 9cnlwi6 ix)ing to the West (-x direction) begins to slow down as it approaches8 xsw,69 i1cb iliycwp)n66vb a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocitdrj.gj7pph -e840 shl y. Make a statement concerning its accelerationj.e-rj7pp0 h ls8 4gdh.

  If the velocity of an object is zero, does it mean that07 ds)snfxou9 the acceleration is zero? Support dxf97nsso)u0 your answer with an example.

  Can an object's velocity change dio*5 vprlyl tw10f5yi(+2,tca oj6)ig i7ocxgrection when its acceleration is constant? Support your a5f j*ot27icpl,wy(y+ l50rto g)1i6ic vxgo answer with an example.

  Suppose that an objec0g/ r3:wya/a p*qc inet is moving with constant acceleration. Make a statement concerning its motion with respect ryw// nqgiaepa *: c30to time.

  Can an object have increasing speed while its acceleration (;d+:tb :b)wirf:hut 9j tsgpis decreasing? Support your answer with an etw:9ur:b + :bgthtij;fpd s() xample.

  Suppose a can, after an initial kick, moves up alongf,9h-n9 f4o rqfw)vhr a smooth hill of ice. Make a statement concerning its ac9n4 q9 v-hfhw rffr,)oceleration.

  Under what condition is average velocity equal to the averagxtt-f . x3rm1(ijpe*rmw om x4ir ,l3/e of the object's initrom.ixxmp-,*f3e j(3im1t / 4xrtr wl ial and final velocity?

  Objects A and B both:q (afo, iis(b start at rest. They both accelerate at the same rate. However, object A accelerates for twice the timsbf(oiq(:a , ie 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 accfpg8ao m((uvu dx60y9c4m x nw5t)g,a elerate at the same rate. However, object A accelerates for twice the time as object B. da6gv0apcun t45m(xxy 9u8)f mow g,( 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 absencep-g5hru i2d.l of friction, which of the following is true conce5d.2 ihlpg-r urning its motion?

  When an object is released from rest and falls in the absenllrg5hgz 3+ a.ogvh03ce of friction, which of the following is true coh5rg az+glgv.33o 0 lhncerning its motion?

  Suppose a ball is thrown straight up.ne d5q bpqz 4myxd,o2u:5/lycr 4asqu1,2b v3 Make a statement about the velocity and the acceleration whenr5,u42xdqs,b 4y2eopqm c blzd/1ny a35:uvq the ball reaches the highest point.

  Suppose a ball is thrown straight up. Whatjq66/k4lom1xy 8 m gafdp-o3s is its acceleration just before it rm8s mk/q 6p36 1yxlfga4 o-ojdeaches its highest point?

  Suppose a ball is thrown straight up, reaches a mad0v 8/6- cq*b3tt x0qiolnn qaximum height, then falls to it6t annb/iqxt0qoldv-q803* cs initial height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then fatlp* jg4 j gce 0earr jzvf8mz9rf9.v(;8 f+p)lls to its initial height. Make a statement about the direction of the velocity and acceleration as the ballel4vt.08z vcf rrpam ;g( jeg9rp8)+j *z9jff is coming down.

  Suppose a ball is thrown downward in the absence of air resisvp hor8-t5 r6btance. Make a statement coropvhb56r- 8tncerning its acceleration.

  Suppose a skydiver jumps from a high-flyine+co+h qct1 3b1oo-5nwzzzv ( g plane. What is her acceleration when she she reaches termiq3tcoboz -v +ecnzwoh(z+5 1 1nal velocity?

  A ball is thrown vertically upward with a speed v. An identical sectz)7 . y 7dp1g(lpssxxond 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 gt gs7xsl. pyz)1p 7xd(o than the first ball?)

  Ball A is dropped from the top of a bupgwb q5t b-mq/kkqx y6pd- )8:ilding. One second later, ball B is dropped from the same building. As time progresses, the dipq)5x y/d: -kpwmbt-q kgb 8q6stance between them

  Ball A is dropped from the top of a building. One second later, ball Bq w; b7)pp))oe eey esm0)emd4 is dropped from the pe4) qe)e)ym70 wmeeosd;)b psame building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One ist(k /zsmcr0w u -sm84i thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit t ( ts/zk-iwcm4smr0u8he street?

  A brick is dropped from the top of a building. A second brick is,kp8ohydts0y )-jv/ 4jr8sdfqmf 3 3s thrown straight down from the sf rf8osm ypv d8h0/j tky3,s)j34 qsd-ame 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 the6o9e aruf 40up +x axis. The position versus uap ru0fe6o49time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axih yl0eke)) n/fi.p*,nki ixp8s. The position versus time graph of this oi*pin8f. xl/,pyekk )0ihne)bject is

  An object is moving with constant non-zero ve3tmoiqcu g/-2 locity in the +x axis. The velocity versus time graph of this object qc/t- 32im gouis

  An object is moving with constant non-zero acceleration in the +x axis. The velmv;o aww6c66 docity v6 wo6dv6cm;waersus time graph of this object is

  The slope of a position versus time u; 9(f 3bpdrgcgraph gives

  The slope of a veloc ft, d-3 ibukli 1: abh(o+62vsqub.zgity versus time graph gives

  The area under a curve in an accelerationim9j(9 nwzrie31/m,.n4 qavkix fm. s versus time graph gives

  The area under a curve ix m))gha33jmg n a velocity versus time graph gives

  If the position versus time graph of an objek2/jn4xma cy;ct is a horizontal line, the object ixmn ac/2kjy;4 s

  If the position versus time jozzm639hj1b+d rc7fgraph of an object is a vertical line, the object isj3m6h7 forjcz91 +bd z

  If the velocity versus time graph oau;v,rft 2fd8 v *d+vpf an object is a horizontal line, the object isft+2r u;8v a ,*vpfvdd

  If the velocity versus time graph of a4vud- ddi2kal*9; ne 1tl. glcn object is a straight line making an angle of 30 degrees with the time axis, the object i cdu-i*nlkev9 dd14.gl2;t la s

  An object moves 15.0 s*mi, b zd-0 s+pdfd33cdiav2m north and then 11.0 m south. Find both the distance traveled anpv addmbz2, 3sc-id3*si0 +dfd the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it ts v2jh9i n lavrg.69y9ake to move 12 km upstream in a river f9 y i6vn99h vl.j2rasglowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mp4wztt lf0)g +i = 1609 m)

  What must be your average sp5+fxml+ x vmg)eed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximatkl 7dbnv,r c s9sc:c (v)wha 5wga7b33ely 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in v)5wrsg c7b7wa:,9(3 k cad3 s lvnbhcm/s?

  A car travels 90 km/h. How long does it take for itp/*phno6w,3/g3zc dq x:tzpm to travel 400 km?

  A ly (light year) is the distance that light travels in one yecajh5k he xv +0q4f)w9ar. The speed of ligkc9wh+xjf5 h)e vaq 04ht 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.o yh9t)trv+ reuv3,fi-kz9r km/h along a straight road and you look to the side for 4.0 s, h ftr 9ur.3y,ko- z tre9v+vi)how far do you travel during this inattentive period?

  If you run a complete loop around a;oev sixipgxu qr-9,/y;rz 5 )n outdoor track (400 m), in 100 s, your average v qig-o5rvxx/pz)ireu; s9;,y elocity is

  A polar bear starts ato.g y* 1mnn9z0v6ybu x :waya7 the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0azm yw *1 y 7oxubg90nv.yan6: km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 rd g)mw+8w zw5km east, then 1.0 km north, then 1.0 km west to return to its startingw mzw+r)85d wg point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from b0x ee(i- y:zh0rh,m 4qffy ;fschool at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive h0er qie,(-:xm h byf;zy ff04home 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 is the averag2,wczvik yw+: e speed of the motorist for thy ww+:zc2kiv,is trip?

  A motorist travels forit,3f 484ln lf6l6 6tjyzekye 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her aver j le6 k t4n46lfyfy86,3tiezlage speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 2b6a*:kszn5s;p6(q jfb gfv rn.b p0p0 50 mi/h north for 750 vs.0kq5b: fa0j;(*sg 6pp6zbr bpnn f miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person wh o3* 2jq7 clt2jhignq4o runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m in 10.1 s. What is the largest lead the team B runner can have when the team A runner starts the final leg of the race, in order that the team A runnniq ohq*3jc 7lgt224j er not lose the race?

  A car decelerates uniformly and comes to a stop after 10 s. The car'utg w(+,uvaf0;z uq:zs average velocity during deceleration was 30 km/h. What was the car's deceleration while slowivu;u,:wzgaf uz+ t 0q(ng down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the avcua8:kop :/ zmerage rate of :z8up/ mcao :k$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates a7:u f/t1a: aqbi whao;t 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 o-xy)oy4pb r: and 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 ej p 3+-qsl/pifor 10 s. It then speeds up with a constant acceleration o+ -p/q3ise jplf $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 2.7 ne 6as/(une dh7ms)amgu 9cv0*mzc9 0m/s experiences a constant acceleration o6ezmd99nav u ma)0h/m07e * gsc(scnu f $1.9 \; m/s^2$. What is the cart's displacement during the first 7.8 s of its motion?

  A bullet moving horizontally tcb*mkuvdm+2.+,2c hi t gq-az o the right (+x direction) with a speed of 432 m/s strikes a sandbag and penethi u 2,bvm+m.z+2kcqc- a t*gdrates a distance of 44.80 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapula:eu8zsv9a,b zh.k 2zt on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceler.ukz8hs zva,a9 2eb:zation is constant, what is the length of the catapult?

  A car starting from rest moves with constant accs,yhsflt* ,)beleration 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 of 200 m. What is its/adiormnjk6 2 /s5:y oh+jx+y average acceleration?2sjhornjd 5 yok+6y:+mi x//a

  An object starts from rest and undergoes uniform accelerar xi ;(;osssx0tion. During the first second it travels 4.8 m. How far will it travel duris o(x;0s ;rsixng the third second?

  An object is moving in a straight line with coy9dqiep fv3l g1 fi(;(nstant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. Hov1d3liy9(e ipf f;q( gw far does it move during this time?

  A car starts from rest and accelerates ut7 s3/m v5m1p 2ldgcncniformly 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 cox.vnn4dr , mcnh u1xx+) s.aw5us i2,an 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 liqq25bp4j.w gm 7 wzfydm1sf* ,ght turns green, a car that has been waiting at the intersection starts ahead with a consf5qzmf j,s.p247y 1qdb *wgwmtant 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 4bd/a-y+myx+br+ a on* t0z mhwith a speed of 12 m/s on the surface of planet X where the rmb+n/ +d*oth +yabzx0a-4 ymacceleration 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 plano5 o,wsrvx)/d 1nxa(:rxw w5wet X where the accelernww(d/1 x) roa5:x5wsrovwx ,ation 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:to gmciu ;2s r23br3id of 15 m/s on the surface of planet X where the acce2sticrg;i2 br3 mu: 3oleration 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 14 m/s on the surface of planet8lvn ocj/b0 ) x1az.pa X where the acceleratio / czxa)0nv.p1a bl8ojn 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 friend0vg ikdylf38. holds a ruler between your fingers and releases it without warning, how far can yo l8 3fydikv0g.u expect the ruler to fall before you catch it?

  A ball is thrown upward at a velociv4gj7 8uyzy 2,vfgo c wu0c.j7ty of 19.6 m/s. What is its velocity after 3. c, vy vgwy.f0cu72oj4 gzu78j00 s?

  A bullet shot straight up returns to its starting point in 8 s. What is 9*s9bim;*+ k2wfcrypz g dq 5*fx ms)pthe initial speed of thezim k) cgsdm;5r+*xqb*s9p* 2 wfpy 9f bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long g/vl zb5 zgvw :+0q)mqdoes it take to return to its startingl0zgg:vq 5)b +zw /vqm point?

  A ball is thrown downward from wb.t5w :v kls,)e c 5kjw:jpu7the top of a building with an initial speed of 30 m/s. It strikes the ground after 6.4 .v: esjlbt55wwk kj :)ucw 7p,s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (onlv o:9:dw ejljz, q 55iojeg,5ty fill in numerical value in the qz9e,i j lev 5wtgj5oj5:,:doblanks)
(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 intepx +jg 2h*) -lb*7j;*qyymfq k3jyyjo the air with a speed of 27.0 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 13 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 13.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is then69h i fgax h6fa*:vt6 velocity at t = 1.0 s?

  In Fig. below, what ii1x(4v*yxlt5p; h ghjtch3m/s the velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t7 /s firw/- azhj3f*qg(ba1 rp = 4.0 s?

  In Fig. below, what is the velocity at t = 5.tm ,l, i )/yv,a.n3+dsgcbyqp5 s?

  In Fig. below, what is the average velocity f k8j*vxy(dge 8rom 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 to 65mfma0r1 sp. u.0 s?

  In Fig. below, what is the accelegk 9as 3o:+;r iiygzz6ration at 1.0 s?

  In Fig. below, what is the .,g s;x4*vjfpa,vler acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 tnpcge)v;1hgqga(; d .o4so 4zo 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 8.0 s/i1;z2 n+ wniirjx: gy/rffy:?

  In Fig. below, what is4u4+6u pnijaf2p xu:m the displacement from 0 to 8.0 s?

Does a car speedometer measure speed, vel*j*khgqi y *d3/qm1xlocity? {speed|velocity}

  An object can have a varying speed if its velocity is cons0g60n3xeh5mo5 zv)qt fli 3jd +a dgs4tant.

  The velocity of an object can be negative when its acceleration is positive.6rxv)j/ )gszrouo8 -m

  If one object has a greatefh f47nw(),ybh ab hw,z -wj;jr speed than a second object, the first must have a greater ac) ,,b w hbnha;4zf-wfyhjw( 7jceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling witash7g ume -2:rxu ;(ty7k)gm th 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 decreasq 0+ cxmw ar9o,osm1s2es.

  A baseball player hits a foul ball straight ulw.v0ejp *;aby6 at7jx4* bxqfkd0t,p into the air. It leaves the bat with a speed oj t0v*djx* 7abelf4xpyk0a;.w ,t6bq f $120 \; km/h$. 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 hdqpq.xw 1-yb:c iba/zg)* 6uw8fbv2 acceleration, how does it change if air frictiohxzu./1f*vwi6:p- cb bq) qg 2bdya8wn is ignored?

  As a freely falling object speeds up, what is happening to its accehm q5 yx;ng)geq05wd*leration, how does it change if ai0h* gy d;mne )w5qxq5gr friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original position+9rg-s0 qvzw suh+ 6kw with the same speed as it had initially if air resistance is negligible. If air resistance is appreciablevh-+krsqzwwug 9 6+s0 , how will this result be altered?

  An object can have zero velocity and nonzero acceleratio 4vert9t/f2w8yy7s3l vr4gkhb;i qv )n at the same time.

  An object can have nonz+8 n zx9bk*cdgero velocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no bu (7 twpc v/0k5;kk-6hnugb wstops along the way has zero acceleration all thuwcb h7 kk nv-b6;0k(5/t gwpue time.

  A rolling ball moves6db,ss(yat 6vog9 yeksk :g)2 from $x_1=2.8 \mathrm{~cm}$ to $x_2=-8.2 \mathrm{~cm}$ during the time from $t_1=1.4 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.3 \mathrm{~s}$ is at $x_1=2.9 \mathrm{~cm}$ and at $t_2=3.3 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete qc.:8pqsh rh 0 z9/dzmlaps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.9 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its si4b*u j2dz/j1kx 7 vgtrainer in a straight line, moving 107 m away in 8.7 s. It tjid72xz4*g/vb s 1 kjuhen turns abruptly and 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 xw 9fv,ltcpcb9sfswg : :g;w+y stj92 +zml)+$10 \; m/s$ to $23 \; m/s$ in 4.7 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 ;7hh-g* xqroz/mxuwjer4s *($15 \; m/s$ to rest in a distance of 84 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a/0idv9:d,ld a8 eueqq speed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top speed)4kdpyn r2 4hfq dfr)3 lv1e(t about ( 24ydhrt)lkf4v p1 fd3 )erqn$10.9 \; m/s$ in the first 14.1 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 unifoxn znt e,/vs *(ir :dcl e 0vav:9wvvf/+/cu-drmly from a speed of $15 \; m/s$ to rest in 5.71 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m long on the highway. Assumingh 7*8ano z0xzr)g/cquxlfb4l+ -v v4 h a h+b7q c0/ xl *vruxg8-lv zzf ah)44nodeceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trb()seq:d0y q+4hn +qi cc(nsguck 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 exa,y s-g;/b opkf+l0, smv3ed fzctly 27.0 min, there are still 1100 m to go. The runn ev,m;s yb,d+f-0lsozkgpf 3 /er must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$