Suppose that an object travel e+3 cyxbwa8-g4 :wbbms from one point in space to another. Make a comparison between the displacement and the distance traby4+ b 8-exw:g 3cmbwaveled.

  When is the average velocity of an objectpe h: +lnwdnh 527:cbg equal to the instantaneous velocity?

  A new car manufacturer advertises that their cm (v 7sks2r:nzar can go "from zero to sixty in 8 s". This is a descrisnr7s kmz: (2vption of

  An object moving in the +x axis experience +7elzm 4tmnd,s an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins t,b0fu35 x,s ems lx;nz)c jgx8o slow down as it approaches a xzjg0fbn c m ,s53l; ue),xs8xtraffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to ofc9f gws4 m(1the West (-x direction) begins to slow down as it approaches a traffic light. Make c19 4sw(gomf fa statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statpldr.- / ,vioyo9jbe, ement concerning its accelere/por9 boj -vl,d,y.iation.

  If the velocity of an objebm)bjx(s:fsy t .xl3q 2mnuhjj0t-)4ct is zero, does it mean that the acceleration is zero? Support your anmsnthlq ub 4 jsy2x3x0-t(b)) .m:jfjswer with an example.

  Can an object's velocity change direction when its acceleration is constant? g6s/f i2vvug +m5vhg( Support your answer with an exam 56vgmg2g ivs /fhu+(vple.

  Suppose that an object is moving with constant 5 t;d)hfdm.cx .bykd(p 2nz 7racceleration. Make a statement concerning its motrphbtyd(dk.z .md 2; cf5nx)7ion with respect to time.

  Can an object have increasing speed whiy;m; drlzjuz ;qw15d 2le its acceleration is decreasing? Support your answwj;m5 qr1zlz; u;2yd der with an example.

  Suppose a can, after an initial kick, moves up along a smooth i 5c b( gqa4lr gt3i4iog7ky87hill of ice. Make a statement (g3g4i45abcr i o7i lyqk 7g8tconcerning its acceleration.

  Under what condition is average velocity equal to the avegz.b 3yi+ub3r rage of the object's initial and final veloc3g+zybubr 3 .iity?

  Objects A and B both start at rest. They both accele*x ):vz4h h -zm(p1d6rd qbyjorate at the same rate. However, object A accelerates for twice the tidr-q o 4d x6 z:hpj*)ymzbvh1(me 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 acceleno:g wh6)fqe0rate at the same rate. However, object A accelerates for twice the time as object B. o)ng6 0eh qfw: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, whicha ;6pa /l/rfa,,gb is/ale -wp ofplrgf ;a,w/b- aae,a6psi / /l the following is true concerning its motion?

  When an object is released from rest and falls in theibrf:gl kr;nh )7+q 6i absence of friction, which of the folkbiin ;hl q+r7)gf6:rlowing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement asb:zbeatw j.-c0;sf )yuik i 8+0v :ukbout the velocity and the accelera0:y. icbw k+8ssveiuka;bj 0 )-tfz:ution when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleratioj vl3x dmsuk:v3ps5o.ai 05h6n just before it reacx 5m0o:vksv hsji.l33u6da 5phes its highest point?

  Suppose a ball is thrown straight up, reaches a maximum heige12r jcj/ 9h9e hb;rrbht, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball hrbhj1 e/ rc9j reb2;9is going up.

  A ball is thrown straight up, reaches a maximum heighj 6b/r i b0nxx-l/0vw)xv: (ja madiu(t, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming dovin :adb imx6rvxu/(jl(0 xw/-bj0a) wn.

  Suppose a ball is thrown downward in+q9ij/x3 h)fqnxrsi ;mf 5/ id the absence of air resistance. Make a statement concerning its /r fqix+m9);qd ii 3hnf5jx/sacceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleratio c5r3c9aufc* p(r0vutn when she sauv5 9u*fcr rtp 0cc(3he reaches terminal velocity?

  A ball is thrown vertically upward wit zidcr) +.nx2sh a speed v. An identical second ball is thrown upward with a speed 2vcn.)zixr d+s2 (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. On2803 fwed plote second later, ball B is dropped from the same building. As time progresses, the distance between the23po8dwf0 elt m

  Ball A is dropped from the top of a building. One second lateq8f jym ,v;r+ti7dds7r, ball B is dropped from the same building. As time progresses, the difference in their speeddm,tfiy8rd 7sq j+7;v s

  Two objects are thrown from the top of a tall building. One is thrown up,m2x/hbo f 5p v8ouhjh1)o86xf8g8 vfy and the other is thrown down, both with the same initial speed. What are their speeds whenv1y vx/6gx)p85of8huo8o jb2h8fh m f they hit the street?

  A brick is dropped from the top of a bula;i vnu3u /,uilding. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerauln u;3v,i/ uations of the two bricks.

  An object is moving with constant non-zero velowjo; 5 we ok9b4igj4m3city in the +x axis. The position versus time graph of this o;bwo i kg49j35 wmoe4jbject is

  An object is moving with constant non-zero acceleration in the +xqu/, mlf*8tyx axis. The position versus time graph oylquf*8 x ,/mtf this object is

  An object is moving with constant non-zero velocity in the +x axis. The veloci,qxw*i)h o +mxe1m +f+ t:o7anv rey6vty versus time graph of +r 6i xywfq*e+ne)v ahtv1mm ,oox 7+:this object is

  An object is moving with constant non-zero acceleration in the +x axis4)xp +c tqz j-b1zjus ywt+)u6. The velocity versus titz)bq+6ty x+ ujzsj)pc 1u4- wme graph of this object is

  The slope of a position versh3 501g mvxtsr kfur/gx:) 3jzus time graph gives

  The slope of a velocityr*s jjf1s*,dke :rm l+i 9 xsh-glef-. versus time graph gives

  The area under a curve in an acceleration versus time graph ul(w9/, hzvsp gives

  The area under a curve in a veloc2.c-agl; mnbxm (s j:city versus time graph gives

  If the position versus time graph of an object is a horizontal line, the obu4ivn65;kz ;,ya8 vhb8ud qhtject 5 8bhq y,;8;uhn4 tvz6 kdaiuvis

  If the position versus time graph of an object is a vertical line, the objec 4wyye,x8m a6at isw846 yyaamx e,

  If the velocity versus time graph of an object is a horizontal lin ,(d k98m e8vptb5upsae, the object ( b88v5tuak ps9p,emd is

  If the velocity versus time graph of an object is a straight line making an angljn/.9 eb4(mo qnrs:ve e of 30 degrees with the timn e.mn(be4 rqso/v: 9je axis, the object is

  An object moves 15.0 m 03ienmo4xsf(1y9ea unorth and then 11.0 m south. Find both the distance traveled and the magnitude of 1(ye fnx4s 3ue0m ioa9the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to kd2hd4ok (pfy- 6,yv2ot-kbq move 12 km upstream in a o2b h yfk 4,2 (dpvktd-o6-kqyriver flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi g5z az8:g9)zi gf6dqf = 1609 m)

  What must be your average speed in order to31a8zmp1- jrrj8w:ddkzj c tnp/af.4 travel 350 km in 5.15 h?

  A runner ran the marathon (approxip22zmvxv so 5;d +i7vnmately 42.0 km) in 2 hours and 57 min. What is the average speed ofx onvm2dz;+p7iv v 25s the runner in m/s?

  A car travels 90 km/h. How long does it take for it tt*:u nxcirn4. fx2nzp0b 6p3b o travel 400 km?

  A ly (light year) is the distance that light travels in o0nj:8zl,g)s:c(yggjr ln6vz c jv 7 6sne year. The speed of lightns:glg zsn7)cvg(zj jcv:80l,6 y6r j 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 for 5l*+x2t(jrkt t+ lbd0on0v np 4.0 s, how far do you travel during this inattentivb x p0+l+ ( jvttltokrn2*5d0ne period?

  If you run a complete loop around an outdoor track)7/ oos.ex,s9o3v :,bjvph+ zp 7gr)ygh ofka (400 m), in 100 s, your average x7a g,v y 9sojhpborf+ozpk3).h7e )v:ogs,/ velocity is

  A polar bear starts at the North Pole. y:yygd x: jb ;r1;uk1rIt travels 1.0 km south, then 1.0 km east, then 1.0 ; 1g:uyy:jdry1 xrb;kkm 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 Po 5 g:v prqvtoas,e:6i/le. 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. vg: i6/t q:e,vsa5rop 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 mile545gqool sxk 4s. It then starts to snow and you slow to 35 mi/h. You 4l x5k4o5so gqarrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at jy4;g kz41mg 7f:xsyr80 km/h and 160 km at 100 km/h. What is the average;1 gyg7m kfyr4sxj:z4 speed of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h z-rachz3pk(xa ,p ,4( isny9u e5oz)g at 100 km/h. What is her average speed for th()zgu 9oa3xz e si,5,pz-rpnyakh 4c(e trip?

  An airplane travels at 300 mi/h south ftzkvs- gm;p- )72gw6m/viny por 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the trip?it- m)ygsnwg2pv6zpmk/ -7 v;

  In a 400-m relay race the anchorman (the p go 5ba(2nd*1y/ctt yierson who 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. Wogicy*ytt nad 2/ (51bhat 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 14 s. zarl0qg- -n zj4q4n;r The car's average velocity during deceleration was 60 km/h. What -q4zgn;qj- azr ln0r4 was the car's deceleration while slowing down?

  An airplane increases itc9 sqho7m ac1 3tk.q -8ucct) mloqi2;s speed from 100 m/s to 160 m/s, at the average rate of uq1ocqco;t l 7k8 3 9.-2at)cscmiqmh$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h3 m(vxatodva6e /nw4 9;ww,hu 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 rest )rp- vmo f1*9rnjaot8 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.v,;pp)ot 1gq+ kq.*ld bscc1n It then speeds up with a constant acceleration bnp,1+qkg csoc; 1. pv) dlt*qof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 2.5 mfeozjam3+ )+kkwp g/ +/s experiences a constant acceleration of k3a+o+k ez+mw )/fjpg $1.1 \; m/s^2$. What is the cart's displacement during the first 10.0 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 530 mmucv)vbj e 8k 2:nc *r5mjjxw4jlzv 5/i +w3,r/s strikes a sandbag and penetrates a distance of 36.28 cm. What is the average acceleration, /jknjr, br2wmvu 55e)cv l43mx+:j8zvj *iw cin $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapultwsg q,kyp74cg 6t9sp - 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 acceleration is congtq6 ps y pwcsg9-,4k7stant, what is the length of the catapult?

  A car starting from rest moves wk f-36 k8(pdxfv(jivtith constant acceleration of $2.0 \; m/s^2$ for 10 s, then travels with constant speed for another 10 s, and then finally slows to a stop with constant acceleration of
-$2.0 \; m/s^2$. How far does it travel?

  A car goes from 40 m/s to 80 m/s in a distance of 200 m. Whatr6 nm qtaw8+)ku4v7mt is its average acceleration?wvm8un6k q7t4+)a mtr

  An object starts frou z0lx0+tys i5m rest and undergoes uniform acceleration. During the first second it travels 7.3 m. Howu0 sxt0il 5yz+ far will it travel during the third second?

  An object is moving in a straight line with constant acceleratw/9u my31/ -y2xpky bp6brbnvion. Initially it is traveling at 16 m/s. Three spb- n yymk/b9wuy62 pbr /13vxeconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates8v p 4:*gcxq46snlyfz 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 o7 /*nhco 2qubzn a dry road can decelerate at about $5.0 \; m/s^2$ when braking. Suppose a car is initially traveling at 55 mi/h.
(a.) How much time does it take the car to stop?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ ((only input numerical values)

  At the instant a traffic light turv*x+xp f0 3jtl8cca5n vhl ,)lns green, a car that has been waiting at the intersection starts ahead with a constant a,c fv x5a8xt*j+0)plll h3nv ccceleration 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 upwakx nync)a)mfh5(;za2 rd with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity is ak25f)yh nz);c mn (ax$1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of 12 m/s z3;/tnx 1 nt :nfpa,umon the surface of planet X where the acceleration due to gravity is n;t nazn1xp u,/fm3:t$1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upward with a speed of 15 m d3q v 9cv6h.2za+)r falnby9f/s on the surface of planet X where the acceleration due tory 6 .f)vl cfbq9ah3 vdn9az2+ 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 l2.( e/kt8 dmfcbm5rezm m*8f with a speed of 14 m/s on the surface of planet X where the acceleration fz/keblm (r8 t m.e5fdcm28m* 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. v2 gpqwhl6z- h8:xj*n If your friend holds a ruler between your fingers and releases it without warning, how far xz:gjlnvh8h2* -q w6pcan you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/w)n+c)aw 0ua ts. What is its velocity after 3.00a wct)+n0aw )u s?

  A bullet shot straight up returns to its starting point in 12 s. What is the yiu uk88;fhsqvd p8w-621c pp initial speeduppyc s82hkuwq6i88v- p1;fd of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. Hok*qm 5zd g624iclycwr a;mk.*w long does it take to return to ik2qm zm*rcy4ad*5 ic;gwk. l6ts starting point?

  A ball is thrown downward from the top of a building with an initial spee .ia.y6y3y kdwm sfph .duj)(8j5 w4ew zjwr9.d of 9 m/s. It strikes the ground after 1.4 s. How high is the buildins 9kjzruywj)wm6i w8y(y 3afe..jpd .5hd4.wg?

  A ball is thrown straight up with a speed of 30 m/s. (onlq/zcblv(f b :,*6 rldqy fill in numerical value in the blank,llbqfr z: d(6q/cvb*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 sti ) j:ynde16mb,nbxe 8vs5s q2raight up into the air with a speed of 43.9 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 5 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 5.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocit8z dp 9r z)qo,khy:ja7vwal,).kvz vh ,m82ujy at t = 1.0 s?

  In Fig. below, what is the velocity at t w03 8(n efnwpi= 2.5 s?

  In Fig. below, what isbsery wlu+8)crr+ g. 8 the velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5.x e-dny5e24w,q / goc 9tlly(y5 s?

  In Fig. below, what is the average veloy)tv)z-c6o,yc.w(r- a uw(pc8 t m hukcity from 0 to 4.0 s?

  In Fig. below, what isj;s(mn d/)a ak the average velocity from 0 to 6.0 s?

  In Fig. below, what is)lc8)3ac)p l ,kzcdvgnk 07d m the acceleration at 1.0 s?

  In Fig. below, what is th *y*1sjr)oy,ko yzrdqze0x6f 5*kp5 7xn4ujde acceleration at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to ai)r e4ha( ,gd5.0 s?

  In Fig. below, what is the average acceleration j+y+h zdq n5.9lvvu,(x:zcxfg:p7gs from 0 to 8.0 s?

  In Fig. below, what is th ;ifajthcpm6 1a80yc jr+ 88yye displacement from 0 to 8.0 s?

Does a car speedometer measure speed, v gq/)ca8,d: ug5b hpmoelocity? {speed|velocity}

  An object can have a varying speed if its velocity is constant.:: m 5o2*mp jv-kfdnuc4sq i4q

  The velocity of an object can be negative when its acceler(rpu1 govkd *9ation is positive.

  If one object has a greater speed than a second object, the first ;o55 *;xy qzftv1kudb must have a greater;ktbz* uox1y5 5;dfqv acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a spe.2dsk q44eti ged 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 slcf oo*oc2ca ml(da)0 r0 ty1c;yv8b.peed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the k1u3ef 0 g 7jrjxl+3edair. It leaves the bat with a 0j 1ufeljr3ex7dgk3+ 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 objec(ehmwki; w7v5 t speeds up, what is happening to its acceleration, how does it change if air friction is v;7h im(wk5we ignored?

  As a freely falling object speeds up, what is happening gd / 7bqrs t5t,k7f4gwp;(omy to its acceleration, how g(dt w7 7, smyr5gfqtk4b/; opdoes it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original positio )fagg ajo:( +0k.ue0+jpzsvnn with tag 0j g)e+z.+fja:0svn op(ukhe same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at thecqz:(oqs in;n)au0 6fxu f8(hj9ndq;xq9 ej 7 same time.

  An object can have nonzero ve4l ba.k-fs 3vclocity and zero acceleration at the same time.

  An elevator moving from th) i x5k0t); xsnz(zdgke second floor to the fifth floor making no stops along the way has zero acceleratiokgnizx5z ) sdt)(0x k;n all the time.

  A rolling ball movesl 2cxnr+ 1gmtg812bphmz v. (z from $x_1=2.4 \mathrm{~cm}$ to $x_2=-7.9 \mathrm{~cm}$ during the time from $t_1=1.1 \mathrm{~s}$ to $t_2=5.9 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.4 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=4.3 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarte,f;hdzt235tm,oe1g9 kiy: e /hz i kskr-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.3 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters awayws(/tkvgw)4 ,*murc e from its trainer in a straight line, moving 114 m away in 10.9 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate (a) cwrtg(v )eu ,s w*4mk/its average speed  (数值)  $m/s$ and (b) its average velocity  (数值)  $m/s$ for the entire trip, using “away from the trainer” as the positive direction.

  A car accelerates fr) lbm+:mrzr 0lom $12 \; m/s$ to $23 \; m/s$ in 5.8 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 frod. 6n6 k8zeydx7vc bz8mim62cm $15 \; m/s$ to rest in a distance of 65 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speedb,fe)a +*ly9lpuegz3 : tjlcc- 7 la1s lyb23m of $32 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.3 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst c5v dqkqgv4vzi.37qz8t 8/ b rout of the blocks to essentially top speed aboutbkzg 88d47vqi.rq v53z q/ tvc $10.2 \; m/s$ in the first 12.8 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 unifor jugx23s7bpuxp. w;en6lcf:o y-o /1imly from a speed of $15 \; m/s$ to rest in 4.78 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves sk)3 pastjhr.:kkg(nm2 s0u57: zedrrw id marks 92 m long on the highway. Assuming a decelera : drh0nk )3twrg7:s5m.se( k 2prajuztion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck gqnc (h30ay4 uboing $25 \; m/s$ 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 comp w2ir-mi1 aob8r*uk:ukv8 22 uazhz:ylete the 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. Tv81rk 2uy*wa2kr:uz z 2i aomb8hi-u:he runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$