Suppose that an object travels from onejf+c1- pmsb / et*ahm( point in space to another. Make a comparison between the displacement and the distance m*e1f(jp-mhtb c/+s a traveled.

  When is the average ve7(b-m yb5ea+bw if1gilocity of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sim 2fj,a*1j rfixty in 8 s". This is a 1a mi, rf*f2jjdescription of

  An object moving in the +x axis experiences :(kx kwve1b 3man acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to sloaq0)6e +cb7 dicpjgu+5um,ss37d zf rw down as it approaches a traffic light. M 0u+,dr3c+ isg)aumd7ezcq b67j psf5ake a statement concerning its acceleration.

  Suppose that a car traveling to the West (-q:j2s6rgyy zo :m cx*45 ;klrhtgb.. fx direction) begins to slow down as it approaches a traffic light. Make a statement concerning its accelejqt o:* rzs5 r6:.kf 4yxygg;.hb lm2cration.

  Suppose that an object is moving with a constant velocity. Maz0y)lldwpn *8j cz44k4tq2 og ke a statement concerningk42lp4cqj)yol0* z84znwtg d its acceleration.

  If the velocity of an object is zejfp-js x2 6pcm7s1i /nro, does it mean that the acceleration is zero? 7s-cpx1js/ fm 2p6ijn Support your answer with an example.

  Can an object's velocity change direction ip88krxpp8.m ;bf n-u when its acceleration is constant? Support your answer with an example.rb8xi uppk8m. f-n;p8

  Suppose that an object is moving with constant acceleration. Mak1i2ac ; *feease a statement concerning its motion with respe a*fs21aci ee;ct to time.

  Can an object have increasing speed while its acceleratioscmk:3 (uk7fjjlx g 3;n is decreasing? Support your answer with ;:3 ljc3xkfm7ku s( gjan example.

  Suppose a can, after an initial kick, moves up flr/.d4csneg 6-*l dkalong a smooth hill of ice. Make a statement concerning its accne6 flc 4 dlk/*sd-g.releration.

  Under what condition is average velocity equal .oxcl(8go.bh- g+ wdgu6aja, to the average of the object's initia8u xc abawd,(+-g6oo. .hl gjgl and final velocity?

  Objects A and B both start aj,js-a qdh6s 49odbn;t rest. They both accelerate at the same rate. However, object A accelerates for twice the tid;abj noh 64jd9s-q,s 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 accelerate at tqm lu-gl4a5:4a b x(fshe same rate. However, object A accelerates for twice the time as ob l44al mq-x5 fsgbu(:aject 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 f(gaji,ut0( 6 aqip:zabsence of friction, which of the following is tgf:p (0j6iz a ua,(iqtrue concerning its motion?

  When an object is released from rest and falls in the absence of fr1*bb i;l9u ) uyl) 08xpjibhiyiction, which of the fx b)p ;ubl)ju h 0iil81i*yy9bollowing is true concerning its motion?

  Suppose a ball is thrown straight up. /qxdpj:y7( d jajk-.i0e0ieo Make a statement about the velocity and the acceleration w0/0jaiojq (ek7 -y:d.edi x pjhen the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just bzrq/+ 4ubhl83l d k,rd5)tvogpq3 0sc efore it reaches its highest por5d0 lv, qg8+/ts prlbu)dq4z33 chkoint?

  Suppose a ball is thrown u j1+ ery2+od7w6ia59 bvk cteconf56q-5snh straight up, reaches a maximum height, then falls to its initi7ru2hj5 +e6q d +fobio5ec1nkv s-ntaw5c6y9al height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, rea7qmb* e gpw(ei+p4.s;62:*sygq6wkz z bokkn ches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity an pz+k zo6ek*p6q msy s(:.b;7wgigneqw4bk*2d acceleration as the ball is coming down.

  Suppose a ball is thrown downwg dhi a811mj)rard in the absence of air resistance. Make a statem 8gimj1d rh)1aent concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. What .z 0 lx4*jv3: fo zd,fvdbgt8j)6lckxis her acceleration when she she reaches terminal velocity?) dbf 46otdgj3v 8,z0vx j*.czlk:l fx

  A ball is thrown vertically upward with a speed v. An identical second b/mn :vfcvaz* (nnpw/ (all is thrown upward withv (wnvm/pac:nn /z (f* 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 the first ball?)

  Ball A is dropped from the top of a building. One 4 *zrdm );3*cpgcxxg tsecond later, ball B is dropped from the same building. As time progresses, thg*3cz*c) drxg4p xt ;me distance between them

  Ball A is dropped from the top of a building. One secow*,23ou gcak pnd later, ball B is dropped from the same building. As tgwpakoc2 , 3*uime progresses, the difference in their speeds

  Two objects are thrown from the tg;rj)- lf0sfds/ 6xdfw4i m9rop of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. Wha;fs9-)64fg /m0rdi j xwsfl rdt are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thrown stratw.g ;qsei) w/3 1ue53xqxhxqke ux36ight down from the same building. They are released at the s3wxh x)e6uq kw 3.q5tx1ei g x/3qsue;ame time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constanl l;q9d43(k,pl aau faesg. .oy*sh:mt non-zero velocity in the +x axis. The position .4ual9 khe:ylsfa ;qpom.*3 dgls ,a( versus time graph of this object is

  An object is moving with constant non-zero accelerant 4i)k:d dvu19g6sgbtion in the +x axis. The positiondggd v:)9st1 bikn4 6u versus time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The velocitqk m: ,bvgdslx, b.k)-siz7 9iy versus time graph of this object i, -mil9s) 7zqvbs:k,b kgxd .is

  An object is moving with constant ab98q8 e4z giqnon-zero acceleration in the +x axis. The velocity versus time bgiz 9488qqae graph of this object is

  The slope of a position versus time graph gi p4vks 80y1wfr/8nvwyves

  The slope of a velocity versus time graph gilir81tn ;c +m anx1 cxsw+y.dn32p0xoves

  The area under a curve in an acceleration vsfs j 9i/o g+uomx7.4aersus time graph gives

  The area under a curve in a veloc.q7icv47.v iz :6t vvts halx*9rur,mity versus time graph gives

  If the position versus time graph of an object is a horizontal lin8ljd1+1cq-e e bhek;l e, the object i+-j ec1kb;1q e8l hedls

  If the position versus tim er ,pce;man-* 5p-tgne graph of an object is a vertical line, the object ispp te5;-a*,cmr-gnen

  If the velocity versusbo .7h x*vvr3b time graph of an object is a horizontal line, the object isbhv*3x 7 vor.b

  If the velocity versus time graph of n ky-:5v0,1cui t wd,gutbt7 aan object is a straight line making an angle of 30 degrees with the time axis, the obbi0 d1ua5- 7ugcty ttv,: ,knwject is

  An object moves 15.0 m north and then 11.0 m 9 2fax0d g+imeb(uz ;osouth. Find both the distance traveled and the magnitude o b2iu 0;f9gd+aez( mxof the displacement vector.

  A boat can move at 30 km/h in still water. How long will it takeemvnl(p262m r to move 12 km upstream in a river flowinn(vpe6r l22 mmg 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 mw 6)z2rph g iplmj,31,wobxw 4)

  What must be your average speed in order to travaub)z( m-l)c hm8w4o zel 350 km in 5.15 h?

  A runner ran the marathow370-wjp: dfb cur)v *-dfmnin (approximately 42.0 km) in 2 hours and 57 min. What is the average spe3dnf d biuwv)c-wf:70r -*j pmed of the runner in m/s?

  A car travels 90 km/h. How lonelx89i*nj3 o7l u)zw agee 2t5g does it take for it to travel 400 km?

  A ly (light year) is the distance thyou+8s ac l.)4wc1, b gv6,etletm o*kat light travels in one year. The speed of light is m wub*4elav) k ,osly86ge ,+c1. otct$3.00 \times 10^8 \; m/s$. 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 a4)0zwtyb3z x e,vzpmx;x7s, b straight road and you look to the side for 4.0 s, how far do you travel during v,30z m pezz bbwx,x4x;s7y) tthis inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, yoh i+.w 1d-o;i-nxnk9vm9 m aplur average veo.9-win-m9mali 1+vn;pdxk h locity is

  A polar bear starts at the North Pole. It travels 1.0 km south, a9p4uegqft 7 a:r 86htthen 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was t g4uer6a7 :8tf9tah pqhe bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.y/7 ,tr 6csdli0 km east, then 1.0 km north, then 1.0 km west to return to its s6i,7 ltc rsyd/tarting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school ate+nehw v30ub pm1vn fhj;h5c (xh+q 5. 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown fro;3mcjh1h+p efb(+vn 55 nhvwue x.q0h m school?

  A motorist travels 160dqh; l*k67xpz km at 80 km/h and 160 km at 100 km/h. What is the average speed ;*l dpkz6h7xq of the motorist for this trip?

  A motorist travels for 3.0 h at 80 kmiu5wg8 11fuq qzsq07k,zq mx1/h and 2.0 h at 100 km/h. What is her average speed for the tr7 u wq1ixuqf ,z15zsq 81q0gkmip?

  An airplane travels at 300 mi/h south for 2.00 h and th fh*m. s,iqqqsasi7+z;4g(x pi x 3+ejen at 250 mi/h north for 750 milsx;h+m +qi* .x 3i(jg zqq,s7fai ps4ees. What is the average speed for the trip?

  In a 400-m relay race the anchorman ( 6)kfzj :3qyberxs1+fg2+xcf the person who runs the last 100 m) for team A can run 100 m y e q g+s: fk1r6+xfc3fzxb2)jin 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 runner not lose the race?

  A car decelerates uniformly and comes )2ze uai z1-qx1i*eqcto a stop after 10 s. The car's average velocity during deceleration1i*ez zq2-aq)xiu 1ce was 76 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from ivm9iu1po x9mh;m*f+100 m/s to 160 m/s, at the average rate of vx99f*i1mh+ ipumo;m$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerlh+ ,xn1 rjul:ates 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 ankyf:)rvizb- ( d 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 speedm .g( 9 psdaq)p4b5 ju1mqgx:ls up with a constant acceleration ogp:(qud .jl) ga 5bmx sp9mq41f $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 1.6 m/s experiences a constan1re8vhy* (dcep,1upxj4z oqg /z( et0t acceleration of z 1j q*go/c(rve xpe1uz04,8hytdep($1.8 \; m/s^2$. What is the cart's displacement during the first 6.8 s of its motion?

  A bullet moving horizontally to thevr54ws-c-vtspzc ( b - right (+x direction) with a speed of 425 m/s strikes a sandbag and penetrates a distance of 68.29 cm. Whaczr-ssp5w v-vbt-( c 4t is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier./zv b2fjy3c /u It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration ij 32fy/v/ zubcs constant, what is the length of the catapult?

  A car starting from rest moves with constant accelerationi -i3ski a8/ms 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 a1 4dn7n vosgc*verage acceleratiovn *4ng 1sodc7n?

  An object starts from rest and undergoes uniform acceleration. During 9f6fen4:ktu- opn9-y d8zdwp the first second it travels 2.4 m. How far9- nf8uk:o9-wted d y4z6nfpp will it travel during the third second?

  An object is moving in a straight line witr)sw(29 )0xc pm,gkvpmaan 0l h constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far d2l0 gws)r va( pxp9m,an mk0)coes it move during this time?

  A car starts from rest and accelents3bqi.u w znqi-(8 *rates 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 o.v+d9; 7 ts,m q8qbazr0fqnmln 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 )0 v8v-b1 warp.jlskv turns green, a car that has been waiting at the intersection starts ahead w8ks .a rv1jplw)bv-v 0ith 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 a speefe18lv ty- x;ed of 12 m/s on the surface of planet X where thev1; l-exytf8 e 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 speed of 12 m/s on the surface of plane.v*pz0quo /hon0rw (ct X whe.h/pnz*( qwou 0ov cr0re the 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 ax3fh3z -t3o 8ke s(myupn04g w speed of 15 m/s on the surface of planet X where t x0n4g3 ew3(mftu 3 -o8pkhyszhe acceleration 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 planetxe svky;-h ,h:9jcfete)xj85 2v1kl h X where the acceleration due-y jf he),;5xhkhtejcx1l92 vs:k ve8 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 n5w4+9 n apivgj6ew;g than 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 fallig9nv;gw5p4 nj+ e 6aw before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity aftsb4 p )/aqb1)jf 0klkser 3.000lsj/fkp ak1 )bqsb) 4 s?

  A bullet shot straigl yx 573vlsxr+ht up returns to its starting point in 12 s. What is the initial speed of the bul7vx3s +r5 llxylet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long5w6e0otp fwij8 6 dw:rgotx.q k)x 2a5 does it take to return to its startingxj 8gq5ttw5 .dw6fr e06k paxiw :2oo) point?

  A ball is thrown downward from the top of a building with an initial speez qrw11k9h:cdp+1 w ihd of 10 m/s. It 1k1: 9w1zh cpw rhiqd+strikes the ground after 4.1 s. How high is the building?

  A ball is thrown straight up with a sf7m v 2ik ,h;q,uj4ujv;mx+k mpeed of 30 m/s. (only fill in numerical value in the bl, jj;+mmk;4x7hvm2vi ,ku uf qanks)
(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 38- pt ul34d vlkzh2-*yc.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 3 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 6 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 6.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t =erur 6tr7ht+ (r:ekl 2d7f7nv 1.0 s?

  In Fig. below, what is the velocithb(bt p;p) ;) )ax)hkwh etz3py at t = 2.5 s?

  In Fig. below, what is the vel q +40jih) hut7bh9 l3;uopycmocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = /3o/gh8sbbkx:b)k( t 96zx/)skx rvw bbdc y45.5 s?

  In Fig. below, what is the average velocity from 0 to 4( (m0 dxvoh*izgt76yq .0 s?

  In Fig. below, what is t i0rh0pa;b2ls aj ad4.he average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 syg xh*z*r u7u8?

  In Fig. below, what is the accele+( i1ry+6yh fy2jff pyration at 3.0 s?

  In Fig. below, what is thj5jh2h;xv /eo e average acceleration from 0 to 5.0 s?

  In Fig. below, what is thol3f+xoh)gn/ td )ro 8.9hfzypp1a*ye average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 tcs di :6d(0ox1ji3zh mdo4zf +o 8.0 s?

Does a car speedometer measure s5z-pvpfnczq)- h- o+kml 83sipeed, velocity? {speed|velocity}

  An object can have a varying speed if its vej*c ot,ke:zd*locity is constant.

  The velocity of an object can be negatiusi96l jj; ,vrve when its acceleration is positive.

  If one object has a greater skic u /2m:i 63j28 ;zn heqzag:mqnq/bpeed than a second object, the first must have a greater qze mi:cnnajz8gi :h2quk 3/b6/m q;2acceleration.

  Two cars emerge side by side from a tunnel. Car A sqv5 ij qjrtqu67e: 7o05mg;pis traveling 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 increasinkp cljo(gx olf +o:5zhcxy34 4:onl)1g in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves t20422 okdvb7t0nmsw pw 3xl yjhe bat with a speedy kv032t4jm7w l0bp2n2 sodwx 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 arm1/u t.;eib2hbbpr . j pw/gg p9.7mobject speeds up, what is happening to its acceleration, how does it change if air friction is ignored?rga p bmb/p9g2bp .je;i 7rt.w1h/um.

  As a freely falling object speeds up, what is happening to its accelerat:tak- v9uud 0zbc+:l be wfhi0c r3:x;ion, how does it change if airx w hldiatzcu::3+b9bkucr - ;0f0v:e friction CAN NOT be ignored?

  An object that is thrown vertically upward will g*)b q16cemhn return to its original position with the same speed as it had initially if air resist bgmehq )n61c*ance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzepiqo d tvy 3q/anj075zhj+,h(ro acceleration at the same time.

  An object can have nonzero velocity and zero accele 5y c1xpv*llm0ration at the same time.

  An elevator moving from the second floor to the fifth floor making no stopqhkk(rlr4v3e )hj )s axc:div k*u81(s along the way has zero acceler i( ( *k8dlj3ch:41h qk rvukre)asvx)ation all the time.

  A rolling ball moves from td+9j w1 e5g6 .u0pvtucz8gnd$x_1=2.8 \mathrm{~cm}$ to $x_2=-8.7 \mathrm{~cm}$ during the time from $t_1=2.6 \mathrm{~s}$ to $t_2=5.7 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.6 \mathrm{~s}$ is at $x_1=3.3 \mathrm{~cm}$ and at $t_2=3.7 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight com 1h.qv79z caa)i i tp:ql1h0ablse 9h*plete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 12.0 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 esk2d z:-f(ay 94 m away in 12.9 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) its averks2d-a:zf ( eyage 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 ewi2/1i(cc2y xbew8vd jb8p t+m.g3 a$13 \; m/s$ to $24 \; m/s$ in 4.1 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 p u64hfoa52 b1m lp8gvcf)wj+ $17 \; m/s$ to rest in a distance of 82 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speegiyci3cx)vgi;r 2ds 1 34.k zvd 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 out of the bloctn qar: qz oa1gt3/c(:ks to essentially top speed abou(3n:orqctaqtz a /:g 1t $11.0 \; m/s$ in the first 10.5 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 spo neifze2k /+;w5462 hd kpshjeed of $19 \; m/s$ 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 skibgj78 s uc7bdxj) x,z/d marks 92 m long on the highway. Assuming a / 8cz7jd,ux7j xbsg b)deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goiw .wlmk6b9-lf4:u f;uo1rdx e ng $25 \; m/s$ 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-m30ej rnvqjr+ zv5eg .rnguor04 5q s*+ run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then accelerategjr0+n4os0jv qr +e veng553uqz *. rr at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$