Suppose that an object travels from one po6eku qf,*c)vzw ee h.2 jv/tc6int in space to another. Make a comparison between the displacement and the distance trave62q.j c,*kte ueeczw)vv /h 6fled.

  When is the average velocity of an object equal to the ins.q/3vux r qvc3tantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty i di 9alk.ay+0en 8 s". This is a descrip kei+la 90y.adtion of

  An object moving in the +x axis experiences an acceleratio9c,cjn 4s;dunllc0ve a,o8a0n 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 xu+99qywsyr 3l jdcn(l-x n 36as it approaches a traffic light. Make a statement concernicw+yuyxn -sq3n69d xl lj 3r(9ng its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slowl saoqk0sajs/ mf*k rh-74 ;7c down as it appr/cor k7qs;faams l*-0j shk74oaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving :l-yeoo jhev2h8 ko*ym4v 8x9t;p0e bwith a constant velocity. Make a statement concerning its acceleratikeo2e h8v8h04 x-ety vy:9m poj;b*loon.

  If the velocity of an object is zero, does it mean td hkn1/ p.to+shat the acceleration is zero? Support your answero1/sp + tk.dnh with an example.

  Can an object's velocity change direction when its acceleration isw,a,s fmgczxsu gd1rir d0tw(( 8-;3p constant? Support your answf,wstr( zu 0sigr -;8xg,mw dc1da(3p er with an example.

  Suppose that an object is moving with constant acceleration. Makiy 2to ,7dt9xte a statement concerning its motion with respect to timy,7 ot t2ixdt9e.

  Can an object have increasing speed while /gtnspx2;/ b 9yo 2ow:- j cb41mnhfsqits acceleration is decreasing? Support your answer wij2cytn sbg4h1o9/sbo nm:p q;f- wx2/th an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. Make*y3ona s5c o3j; 8akkiqe,j/h a state/yikcjhaqe3s* j3 o8nk;o, a5ment concerning its acceleration.

  Under what condition is average velocity equal to the ave6 c/hhd yy -v9fszz)e2rage of the object's initial y-c2y9 df6shzh vez /)and final velocity?

  Objects A and B both start at rest. They both accelerate at the same ra5 ,x d+ke3 my3915xeiekpaodfte. However, object A aede 95exi3doxkmak p5fy1 +, 3ccelerates for twice the time as object B. What is the final speed of object A compared to that of object B?

  Objects A and B both07lw t)7iertb gj( i*a start from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as objecb7g j*tie7(wra0 t l)it 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 fricd;;*i(v mlix(/g)l c 1ciqa tp.qe. oqtion, which of the following is tru.g lt / a ev(cm.qid1coql; i;x*p)i(qe concerning its motion?

  When an object is released from rest and falls in the absu5m fmx2,-hfg ence of friction, which of,m5xh2 g fmu-f the following is true concerning its motion?

  Suppose a ball is th/x78)ixb t* hmive)bg rown straight up. Make a statement about the velocity and the acceleration when the ball reaches the highest poe v/)xx mhtg8*bi)7biint.

  Suppose a ball is thrown straight up. What is its acceleration just befor.pgr.d+n m8 g,og y(g/5s7bsv u rvp+xe it reaches its higheu7.p+gd vg(gp sx/8mrb.5 n+,yvg rsost point?

  Suppose a ball is thrown straight up, reaches a maximum height(7dn1y mzrh( s 7e8f*4n qeqqg, then falls to its initial height. Make a statement about the drqq4z8mqe *feh7 ns n1 (dg(7yirection of the velocity and acceleration as the ball is going up.

  A ball is thrown straightd 3n*tdx;kyxl,9.iy h up, reaches a maximum height, then falls to its initial height. Make a statement abod,n. dy;x yt lx3k*ih9ut the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air rq.s,0i r22eh)xyjnwitdov3 3 esistance. Make a statement concerning its acceleratioq2 rw3 ,n i3.eh2dvs)tij yxo0n.

  Suppose a skydiver jumps from a tix)x*o x46 8ouabzo ,high-flying plane. What is her acceleration when she she reaches terminal z 8xo)uao biotx4x,6*velocity?

  A ball is thrown vertically upwar* utgiwl :fe ghv9.hzjj ajp1, 2bi50*3wk2mrd with a speed v. 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 tthz, e2jr5*k9bhwg *ag muv p.:jw1 0i2 i3ljfhe first ball?)

  Ball A is dropped from the top of a building. One second later, ball B :4cld5yryz 9 sis droppe4y 5lr zd9:yscd from the same building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second latelm .u 6gn3 gz8xsdc8w(r, ball B is dropped zn.g8w6 xcg3sml( du8 from the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. Onev qg/n2o 6* lzhqj*b zl/n3j-i is thrown up, and the other is thrown down, gqonh-l2j*q vz6j3nilz/ */bboth with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thrown xkmn+;wg scf1q.y ,zmfde11tp+ k/ 8ystraight d+ysq.ymk gd , wt/k; 18cepf1znxm+ f1own 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 con, 0jzziz +r*bila8 ; x r(tnxol;e*z,qstant non-zero velocity in the +x axis. The position v80ir ,ri+xt;,jb *zon;zll q(zazxe *ersus time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axisfcw.u q-5;- zqvcdi/f . The position versus time /5uq z qfccvif.d;--wgraph of this object is

  An object is moving with constant non-zero velocity in the +x axis. Tyd4 0 6pw1yixp -e m4xilds ptt/3y/5dhe velocity versus time pyy//id t6dsdxi10 3pt544ewlm-xp ygraph of this object is

  An object is moving xw 2b8 wd*r dp tc34yo0/t;ybswith constant non-zero acceleration in the +x axis. The velocity versus time graph of this object isp t*/2bt;cdy4s 3 d wrx0ybw8o

  The slope of a position versus time graph g37rd p,:nwyuvjvwzm+i4 (xj r* cw+8kives

  The slope of a velocity versus time graph givesu-* :og eqhltt+i:f zj57.cw1n moks(

  The area under a curve in an acceleration versus time grap5nppyyu01t *eh gives

  The area under a curve in a velocity versus time grdyquddxn4/a48 g8 + ugaph gives

  If the position versus time graph of an object*4s1 cd6k aeow is a horizontal line, the object is*ceokswa1 d64

  If the position versus dlj, y)y3ak-x/+d oll time graph of an object is a vertical line, the object isdd -3l/jklol+ yx,ya)

  If the velocity versus time graph of an .g u-x aijwzzgj;w;9fri9u 9 )object is a horizontal line, the object iu9ir9 ;)-fguwjazzgi9.;xwj s

  If the velocity versus time graph of an object i 7ic fd mues1q(jhbi.0 0bic61s a straight line making an angle of 30 degrei 7b01 jdqc0s.mie uihb(c6f1es with the time axis, the object is

  An object moves 15.0 m north and thenzy5m yx9)+chr8lb /lm 11.0 m south. Find both the distance traveled and the magnitude of the displaceme5by l+hlmz8) x9y/rcmnt vector.

  A boat can move at 30 km/h in stie)n)9x2sb3 9gq jihkcll water. How long will it take to move 12 km upstream in a river flo2j)3n k9)qiscx9e hgbwing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 uhs94l h75o uwm)

  What must be your average speed in order to travel 350 kmvna9vdh6g1 w ,wi.e1c in 5.15 h?

  A runner ran the mar02a -p vgstdylp3 7ji*)nq*cyathon (approximately 42.0 km) in 2 hours and 57 min. What is the average n3* y)qv7tdipl0g*apj2-cys speed of the runner in m/s?

  A car travels 90 km/h. Hole0du o /mh++o0tq 0bo3tsy421 ebixiw long does it take for it to travel 400 km?

  A ly (light year) is the distance thak w:cwh;jehx7py- :-,n n/ abst light travels in one year. The speed of l :p aws/xn j7,k:wh;h nye-b-cight 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 stref 8m cqv;r jc0ckq13:jz qatb*10k* kaight road and you look to the side for 4.0 s,tqk: jqb3 zr m8cc;*c0kq0f1aejvk1 * how far do you travel during this inattentive period?

  If you run a complete loop around an h2.2jpd(grhdff i v5.h 3gncp8e)/m loutdoor track (400 m), in 100 s, your average v8epl .r/dimv3f h (2fcn2jd 5)gpg hh.elocity is

  A polar bear starts at the Northcb5n)3rjfc 6h(3gog pe fef47 Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return tf7go4 f c3 5e)grb pj6(3efhcno its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It tr(dl4s :wm4;fxd miip8avels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km dwmd48sm: p x (fl4ii;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 wb-/r lq 4wvo0at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after drivw b/lwq 0vro-4ing 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 juoocs;4 qw s0 w q pu5-dy2k7he-w(r)km/h and 160 km at 100 km/h. What is the average speed of the motori) rjh;owww q--e kcu5s27s(qdopyu 40st for this trip?

  A motorist travels for 3.0 h 7rlas:0r .ym*yqk-hahh0ga g h0*wq - at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the trirqyg0r a.ah k- :w7ms*ah0h0- y lghq*p?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/hdte*:y47id j8 zsvvb/ north for 750 miles. What is the average speed for the vy:d 7*/8 t4sezib jdvtrip?

  In a 400-m relay race the anchorman (the person who runs the last 100 4h67b 9 oczevr,d7bojm) 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,77ozv 4bd je6hoc9br 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 stooocw3j 7de o68b19 kyzp after 11 s. The car's average velocity during deceleration was 36 km/h. What was the car's deceleration wcowo9ojkb 8 37ed6zy1hile slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, 6r/fxszgjd o . vf/l*3at the average rate of v.//*r 6fd3ljxszofg $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 kxs aqhn0w2t9 o3l 7ut)m/h accelerates at the rate of $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from resrmg/swd2sb(ct. 7* r1v d:bd pt 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 for 10 s. It then speeds up with a constant accele )2z ebbcwmc,w/. at/zration obb/ / , mz2a.wc)zwtcef $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 6.1 m/s expe*4ul)aoo;el1 z wr.ydriences a constant acceleration of u.oz;re loy1)da wl4*$2.5 \; m/s^2$. What is the cart's displacement during the first 7.3 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed lltd ij(h h:jaq 9e9a0.q)w:lof 338 m/s strikes a sandbag and penetrates a distance of 39.67 cm. What is the :lehl )9 0qij9:t.a(ld jawqh average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launchedfm5; vcq2vdg- from a catapult 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 g-q dv25f;vc mthe acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constanq t75yx0ad0 n b(zkua/t 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 mw f yp.pv9)l.o/s in a distance of 200 m. What is its average accelerativy .)9 .pplfwoon?

  An object starts from rest and underc ,rcdc1- u46.mwfkbxgoes uniform acceleration. During the first second it travels 4.9 m. How far will it travedu6c m-4.kf wbc xc,r1l during the third second?

  An object is moving in a straigha8a9e)l; )rx nm7 bbmzt line with constant acceleration. Initially it is travelin) 8rbe7xa)ma ;zlmbn9 g 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 acceler dq. mh j4k2sh9s+ipg5ates uniformly at $3.0 \; m/s^2$. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at $5.0 \; m/s^2$. How long does it take the second car to overtake the first car?

  A car with good tires on a dry rodohu w+ns.*no5u7 hr.c6u ;ncad 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 waiting at ( dnm*bdj(d(gthe intersection starts ahead with a constant accelerat* g(ddmj bdn((ion 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 z1, 2j w) m6iz.kccv)ko/dd5 s5xxwpdm/s on the surface of planet X where the acceleration duexv )dw/ 5,s5cz)d1.o2zpj6 mwk dckxi to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward wxxa.xs3 eg.-:sxe8 l,qnvxy 6ith a speed of 12 m/s on the surface of planet X where .x vs xlxg8-3,x:eae6xn.s qythe 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 thpae*ja- x2g- 10m* bjguw4vk de surface of planet X where the acceleration dueg2k d*j xwuab gpj4e-1mav*0 - 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 plano gi)u8xbm di;3zm6pm)fn4 u2et X where the acceleration due to )z;p8643onmiugx fb2m)i m du gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greateiu g4g6iv 9d2xr than 0.10 s. If your friend holds a ruler between 4iv 6 ud9gx2giyour 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 m/s. What is its velocity after h / yd2pmm/,gq3m2/, qhdg /ypm.00 s?

  A bullet shot straight up returns unv0xmi(;lkkpu;mu j,+ w44 h to its starting point in 19 s. What is the initialpmn;wvhulxk4u(, ik4 +0 ;ujm speed of the bullet?

  A ball is thrown straight up with a speed of 3h: 1jzq:l-ziis n* 9os6.0 m/s. How long does it take to return to-s sloq 1njzi:hi9*:z its starting point?

  A ball is thrown down+7y w88fgaf/rdl hy- rward from the top of a building with an initial speed of 26 m/s. It strikes the ground after 5.2 s. How high ifl-dwg /+y8r8r y 7ahfs the building?

  A ball is thrown straight upihq: (0yg ) 9dca j,5+omutjrr with a speed of 30 m/s. (only fill in numerical value in the bl0y orijjrm,:)g 9 +uh5qc(adtanks)
(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 37.1 f c.0ha3 eny *.a,oybzm/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 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 the velocity atoe*5k)ifx 7lq t = 1.0 s?

  In Fig. below, what is thh:w.eltg(s 5m0ab+ 4pe u rja1e velocity at t = 2.5 s?

  In Fig. below, what is the vec3gs6. +yvsz )konh ;rme2r4plocity at t = 4.0 s?

  In Fig. below, what is the velocity at t =yl0 on-sl/ld8,op p3 j 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 swmp*(d9 mi+tnst kyec1. xke mx p/*1.?

  In Fig. below, what is the average velocity fg*ukahmt1h;s;kiz1 bx e u*veiq; 0+4 rom 0 to 6.0 s?

  In Fig. below, what is the accele es /r 8g59q4ybnru.sjration at 1.0 s?

  In Fig. below, what is the acc xz: bkqr(iv/coo ,amb7 7-vk:eleration at 3.0 s?

  In Fig. below, what is the average w1f/dzf hup100qlf70g0grfw acceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0i(b tv88)pg dk to 8.0 s?

  In Fig. below, what is the dis. jp mf+8mb6b(d5d8nffixxfc1/62i xgeh /p aplacement from 0 to 8.0 s?

Does a car speedometer muvdb,q5 9xth/ easure speed, velocity? {speed|velocity}

  An object can have a varying speed if its ld n(xsz9i8s:8sjc4 wnv-4rv velocity is constant.

  The velocity of an object can bdqw w)su el8cd4r,))me negative when its acceleration is positive.

  If one object has a greatvguvj.s nv8w.5 *t4iz )gb 8fper speed than a second object, the first must have a greater nv.tusvf ij)* 8b4zw 5pg.v8gacceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a spee9n 2/oa )2o;hdr: iq;uyuybj sd 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 accelera-ggo jj crd+-q067ctbbc *;6dp akmj1 tion decreases.

  A baseball player hits a foul ball straight up into the u 9-4las(sey jhfw 6.fair. It leaves the bat wit(j afu96hw sf.sey4-lh 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, w7n1n.xon. t;,bn lcbihat is happening to its acceleration, how does it change if air frictionbolt x7nnnnc.bi.1 ,; is ignored?

  As a freely falling obj3:q( m/uc ps- *ncwrfhhb w95aect speeds up, what is happening to its acceleration, how do qhbnwcu s5/aw9mc 3f-hr(:* pes it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward wil)y dom) zze.8hl return to its original position with the same speed as it had initially y m8dh)o )e.zzif air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration h f gc4r tuf21v3v3em1at the same time.

  An object can have nonzero velocity and zero acceleration at the sv)j rjjm4eq.4ame time.

  An elevator moving from the second floor to tsy7 h8r88no nthe fifth floor making no stops along the way hastoh8r n88ns 7y zero acceleration all the time.

  A rolling ball moves from cq:52 i:80h fvuebb vy$x_1=2.9 \mathrm{~cm}$ to $x_2=-5.8 \mathrm{~cm}$ during the time from $t_1=2.3 \mathrm{~s}$ 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 $t_1=-3.9 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=3.7 \mathrm{~s}$ is at $x_2=8.5 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps a1nm re0m9lwn41+ ixfe (g/ootround a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.8 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 113 wr-nr9q;:xgggda )a +m away in 11.0 s. Itn:a)g-aqgd+ x w 9grr; then 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 f2cyjg+t2: jy jf8jum :) t-hs$12 \; m/s$ to $22 \; m/s$ 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 from7wil, 5gw k:wmr nj43x $19 \; m/s$ to rest in a distance of 69 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a sp16n.r e(dagoveed of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.9 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out lx2yku)h);x zc*h q3bof the blocks to essentially top speed abouthk)xqlyu ;xbh*3) cz2 $10.1 \; m/s$ in the first 15.0 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 5:vh .gkj w l x2ed)33lvwf2p-iqdt1nspeed of $19 \; m/s$ to rest in 5.03 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+k vlpct o;m7) the highway. Assuming a )p+c;vlk 7mtodeceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goin-ayvho9vwy:w 9dqv,e + 1h w;(zqpo3,quu hw.g $25 \; m/s$ 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 jg5(gkfun.4wy2 o o3o less than 30.0 min. After exactly 27.0 min, there are still 1100 .y5wno4jg2 f (okgo u3m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$