Suppose that an object travels from one point in space to another. Make a co5xsg o; u9oifmw vzohd y+/k+kuea 3-j*c+ (2ymparison between the +ok3;ofz(5 9 -v/syyh*xk dc2ajuw +gmeo +iudisplacement and the distance traveled.

  When is the average velocity of an object equal to the dm/w khqnm 635instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sc jy.*aks 9316gp )u uyug7iyeixty in 8 pu *7sau3k.gc)uge19 y6yiyj s". This is a description of

  An object moving in the vmm bv)4x-v58 o36vv z. ucp sl.xktg)+x axis experiences an acceleration 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 alv ayl5cxs 59e.shk6tr05kb;s it approaches a traffic light. Make a statement concerning its accelerattarlkl55 s bcx;e 5vk9.0ys6hion.

  Suppose that a car traveling to the West (-x direcvt /art ug+6b+4f m0bhtion) begins to slow down as it approaches a traffic light. Make a statement concerning its/tu+bm0a4g vb6ft rh+ acceleration.

  Suppose that an object is moving with a constant velocsee9 ulqb3j w+.k u6y5ity. Make a statement concerning its6u u3b.+ljkqse5 ey9w acceleration.

  If the velocity of an obkv-0gbe5n f( oject is zero, does it mean that the acceleration is zero? Suppork(f gne0-5v obt your answer with an example.

  Can an object's velocity change dire cajg0z5/ e yyzktma )x8/8j51wnk op3ction when its acceleration is constant? Support your5yw5 e 8kt /zymajcj1p8a/)0oxnk 3zg answer with an example.

  Suppose that an object is moving with constant acceleration. Maq5vfr0 + ewx9 xhi fx6wnet:j336t7x i2nqti7 ke a statement concerning its motion with respect v6xfrqin5itt76w03:xjx wh2e fit7eq 93+x nto time.

  Can an object have increasing speed while its acceleration is decre c-uq47tk h5ho7xtny0bz8wlj7h96s basing? Support y ohtu9t78cj nbyls70h z6 -h45wxqbk 7our answer with an example.

  Suppose a can, after an initial kick, moves up alonc s0 i-qs s)vx+ nx0:gng;lgh 1pa2-jog a smooth hill of ice. Make a statement cong;-poq+vg 1nc ss) : l-0xj0s2ngxihacerning its acceleration.

  Under what condition is average velocity equal to the px kwzrj( 8/c/average of the object's initial k zx8jp/(r cw/and final velocity?

  Objects A and B both start at rest. They both accelerateqiziu4w*3 vj* at the same rate. However, ob3ujiwvq * i4z*ject A accelerates 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 both start from rest. They both accelerate at the same rateono,h/ttx.y 8* 1jmsd. However, s8xnh/1to ,yd* jo.tm object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the absenc-jliqqvhq 4ne+ w0jqp l;;x*5e of friction, which of the following is true concern-q50ewj4;;jv p n*qlix hlq+q ing its motion?

  When an object is released from rest and falls in the c tz6p-z2k3 yqabsence of friction, which z yp6tqc 3z2-kof the following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a stan;*slab42jk,zr kz6t s 8d duyk*2;chdb+ bz,tement about the velocity and the acceleration when the ball reaczd, abrz;bhc2z2 t skjduy 4;*ldkk 8nb*6s,+hes the highest point.

  Suppose a ball is throwwk3 2yzkc4f -uqv.6jvn straight up. What is its acceleration just before it reaches its-yk.vf q wjvu2z6c3k4 highest point?

  Suppose a ball is thrown straight up, reaches a maximum heig09a3m)idp s0v+ vhc bqht, then falls to its initial height. Make a statememvdh39apq0)ib+0 vc snt about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, re fvov.2n5( sgxaches a maximum height, then falls to its initial height. Make a statement about the direction of the svx (fn25vo .gvelocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. ezk :my fivf-71qft:( 4or:gtMake a statement concernivet-g: tz41 yfrf: mf iqk:o(7ng its acceleration.

  Suppose a skydiver jumps from a high-fj6kwhv*1g*ubp:6qx clying plane. What is her acceleration when she she reaches terminal velocikv j6*qgc*b u6p:h 1wxty?

  A ball is thrown vertically upward with a speed v. An identical second ball w)ftutx: ry6) 14eazt is thrown upward wat)4wx ezf6: try ut)1ith 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 second later, ball B is ft78 , xzmeu0x3js,on dropped from the same building. As time progresses, the distance ujo0 8xxm3etsn,z,f7between them

  Ball A is dropped from the top of a builu 3-:hkpss1x .p8 cdtcding. One second later, ball B is dropped from the same building. As time prcpd-k1h:xc.3 tp s8 usogresses, the difference in their speeds

  Two objects are thrown from the top of a tall buildibrapv7pqf hpc: qx1+,6 8(nuwng. One is thrown up, and the other is thrown+np, wqfh1 76acrb8 pu v:pqx( down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a builr4n eifxqq0 yd2q:w0sru 6p++ ding. A second brick is thrown straight down from the same building. They are released at the same time. Neg+dreix4 0unq0w6qfry+p s2 :qlect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The positiown +j:i(mbx kyo5g n;,n versus time graph of this ob bown :(my5;+ngx,j kiject is

  An object is moving with constant non-zero acceleration in the +x axis. The pos;c7*ee. bc 5q mjqiz;dition versus time grz. edm q5*cjb7c;iq ;eaph of this object is

  An object is moving with constant non-zero v:;n7.t q rgazbelocity in the +x axis. The velocity versus tib:g .n7 rqz;tame graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. They4(0 .slldfus( hjhz1 velocity versu1h(s0.z(dhfsu ly4l js time graph of this object is

  The slope of a position ver9iql6-epb x+c sus time graph gives

  The slope of a velocity versus time graph gixfp2:jxi0( m l z/wqcg dn5y9)ves

  The area under a curvehjq zov1(qjl-g-r /aarm70 (ln. q l2f in an acceleration versus time graph gives

  The area under a curve in a velocity versus time graph give+d+afwcp, sh m2ohk53s

  If the position versus time graph of an objec5k(2mt ln/ jlit is a horizontal line, the object i/tk2 (ilm5jnls

  If the position versus time graph of an object is a vertical linerv /k7xi)nfmw51bhr c92(b i e4c0jxz , the object ish( 1xj2rkn 9/imb) zvic5rcx47w0bf e

  If the velocity versus time graph of an object is a,ut(,p9ei u gtxu9o.h horizontal line, the object i(txguiuth99e uo. ,p ,s

  If the velocity versus time graph of an object ij (0cbm9n08z)p gk ihss a straight line making an angle of 9kzb jpsci0(mg0) n8h30 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. ,8iuyu4.:moqh s(vr 5 zqodk8 Find both the distance traveled and the magnitude of the displacement veu qkmo(si8d8r4oz, y5.vuqh: ctor.

  A boat can move at 30 km/h in still water. How long will itp8 3vip10bxwvcs ru;9 take to move 12 km upstrppi8 c; x 3vr0bsuv91weam in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1614dci de- uv(n09 m)

  What must be your average speed in order to travel 350 km in kcgoiht55p39y: t f.r5.15 h?

  A runner ran the marathon (approximately 42. h r:nie2.jx;xtz/6xd,gw x d60 km) in 2 hours and 57 min. What is the average speed of the runneri/:6,e;gx ndr.6 jxz2hd xxtw in m/s?

  A car travels 90 km/h. How long does it take for it xm d5v/hu,rv; ly2ja9to travel 400 km?

  A ly (light year) is the distc/ xtpo49c yd.t8i px-ance that light travels in one year. The speed of light i-xx8c4o pti/9 tpy.d cs $3.00 \times 10^8 \; m/s$. 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 anc+r 9xpb ;8r 8eaz nrc9d79hmbd you look to the side for 4.0 s, how far do you travel during this inatt exn;7rhm9rz8db cb99pcr8a+ entive period?

  If you run a complete loop around an outdoor track (400 m), 15+,ov yo2is t6uosjm in 100 s, your average ot+6 msvi2y sj51o,uo velocity is

  A polar bear starts at the .wgrh322 sc ,x ewby3mNorth Pole. 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. This trip takes 45 min. What was the bear's average speeer.2m2 y bw3c,w3gs xhd?

  A polar bear starts at twwwld rd .+xbw /5g-5 ihi4)sghe North Pole. 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. This trip takes 45 min. What was the bear's average vehwx 5-5d4+.ibisgwl/ ww) dgrlocity?

  You are driving home on a weekend zx ia lx31 i*p2.vc.*xuj/j;veev6 klfrom school at 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 farcx3vexj. xki i16.pe v*aulj2* /v;zl is your hometown from school?

  A motorist travels 160 km at ahsae;:q kfv21o;x8x80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for tfo;aq h x1s:k vxe;a82his trip?

  A motorist travels for 3.0 h at 80 km/h an- ;l0r6zyq3zzx j7c*tdeiq vx(xx4z,d 2.0 h at 100 km/h. What is her average sp-jtqxrd z(zc;e36zxvi,47*qzyx 0x leed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h norh v fo4. zj,1v2wtyb xkmx16,rth for 750 miles. W, k,zth1x4wmb1v2jyr .f xvo 6hat is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100jw j u-vodbahp.-*xhg/gw4 ., 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, id/h -. v-pajxj*h gw.g4owub ,n order that the team A runner not lose the race?

  A car decelerates unifo:s9l6qyh h5w osoxvt2z4g o/9rmly and comes to a stop after 10 s. The car's average velocity during deceleration was 65 km/h. What was the car's deceleration while4oyxovh: t/wh 9zs2sol9gq65 slowing down?

  An airplane increases it+x*.nzbcl z1(+siryns speed from 100 m/s to 160 m/s, at the average rate of zxs . yl+c (b1ri*n+nz$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceleratesl-wi,ixg; j 2.ito*ps 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 and ac aut, qdd4q3f.celerates 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 f7: 1)ylwliqbfor 10 s. It then speeds up with a constant acceleration lf:lq)bw 7y1iof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity n glbal2-a8g 3(vg;qv (dz+ol of 7.8 m/s experiences a constant acceleration ol(voadqg;l (8g3la g2bv -+nzf $4.0 \; m/s^2$. What is the cart's displacement during the first 8.1 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 273 m /cb yoifo7k),43ha: 6k1ch rh dohn:m/s strikes a sandbag and penetrates a distance of 85.22 cm. What is the average o/ 1rnbo4 hf3)co i:c, :kkhahh6dy7m acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an a8b ,1h 7dbe m4tmnr.abircraft carrier. It reaches a speed of 42 m/s at the end of the catapultbnm1a8tdre4. bbh, 7 m, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest mo ndby7l m 9;hlh:.w-maves with 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 200c4b2arva x4 :n5 sf(ox m. What is its average accele(: 5f2carsba on4v4xx ration?

  An object starts from rest and undergoes uniform acceleration. During ma lqq,b0 32swthe first second 2msql 0a3wb q,it travels 6.4 m. How far will it travel during the third second?

  An object is moving in a straight line with constant a m-2(-kh av-ndxotl)icceleration. Initially it is traveling at 16 m/s. Threelod) 2ax(v-hkn- mit- seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates unifordim x131 0c-flw/k lhkmly 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 can decelerate at aboutdoa r7h+60yp/7jc w d)t(mfft $5.0 \; m/s^2$ 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 kqqr:,g8-ez c at the intere grzq-cq,8 k:section starts ahead with a constant acceleration of $2.00 \; m/s^2$. At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.
(a.) Calculate the time necessary for the car to reach the truck.    $s$ (only fill in numerical values)
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.    $m$ (only fill in numerical values)
(c.) Determine the speed of the car when it passes the truck.    $m/s$ (only fill in numerical values)

  An object is thrown upward with a speed of 12 m/s on the surface of planet X w7xc :d,0bt*,i4j f ontyr2a ku dqm8g7here the acceleratcot7db8dx :aquymg* f4 t,,j i270rk nion 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,yd; oc m83obv)(nru: brf3orl:wo/;q fw ag . planet X where the acceleration due to gravity i 3yrfd: fbw3c8: /vgo u;qmn,rl aooobw;(r.)s $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upward with a speed of 15 m/s on the surface of planet X73 w me+f.;ks eclle(t where the acceleration due to g(cl.lke t +w7s 3me;efravity 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 th-h.8qs dp.bvb e surface of planet X where the acceleration due to gravity iss-b hp..db v8q $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is(wyz- wa;nd0c usually greater than 0.10 s. If your friend holds a ruler betweeywnw; - (dz0can your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward af:l kx;mwemkj(2 b 9(dt a velocity of 19.6 m/s. What is its velocity after 3.00 mf2be dj(;wlk9(kx:m s?

  A bullet shot straight up returns to its starting 1 / zqjwqpcou p,6mv+2point in 11 s. What is the initial +p2qv61o,mu /wc qj zpspeed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. 0pktar0 dl1 8b How long does it take to ld080 1 aktrbpreturn to its starting point?

  A ball is thrown downward from the top of a building with an initial speed of k:tpg euoclo4+ s 2e(614 m/s. It strikes the ground after 6.0 s. 4o2peouc l :kse(+6gt How high is the building?

  A ball is thrown straight up with a speed of 32 r*(au zup68o im;gd -abph.r7 8bzwx0 m/s. (only fill in numerical value i-8apu.; wb oz(rh7 26ubmx8drap zig* n the blanks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

  A foul ball is hit straight up into the air with a speedgj svz0u)8jdw, q;:f0n3rxgey w 6a9r of 46.2 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 15 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 15.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the vel lh h4(d7d6roh;piq 7focity at t = 1.0 s?

  In Fig. below, what is the velocity at txakwb i ,-;xi4t b/y*e) t/vs(4tkjdo = 2.5 s?

  In Fig. below, what is the velocity at b s ts at:htxiw/8(on4412d wdt = 4.0 s?

  In Fig. below, what is the velocitym/9e-i03abmhynzfoz 5j 7*9 1 mpfajg at t = 5.5 s?

  In Fig. below, what is the rafj 4(fvz.:i average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velq6w vvui s5a79i7y c)locity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at t9 xll/y5dk kwv/;,fi1.0 s?

  In Fig. below, what is the acceleration at 3.0 s?5zsxwg o *p);y

  In Fig. below, what is the average acceleration from 0 to(a qlf f qdc28 )l2z93ygjkk;p 5.0 s?

  In Fig. below, what is the average accem( ucy4hvmfv7pa :p62leration from 0 to 8.0 s?

  In Fig. below, what is the displacelgt(f 6j4 g31psw3 ohement from 0 to 8.0 s?

Does a car speedometer measure speed, veloci7 spz+e wb5i)-ite 0buty? {speed|velocity}

  An object can have a varying speed if its velocity is crc, 8e-2e*zjc,kjvd aureaki;z .0 )ionstant.

  The velocity of an object cann,6ovcks3ck-iee /ozdpdnjx2r 68 /1 be negative when its acceleration is positive.

  If one object has a greater speed than a second object, the first must have a g7; q wnn.3cov3 0mdlkfrevn;.fowckm3nd3 q l07ater acceleration.

  Two cars emerge side by side from a tunnel. Car A isagw;e7;k ef.u 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 increasing in speed as its acceleratinrnumsxa 1xk8lou)b 8f39 h;6on decreases.

  A baseball player hits a f l9w z:rn3kt r 856wg;pu7g.wnaunr)ioul ball straight up into the air. It leaves the bat with a speedg).l 9 ugrki;zn 5tr36unra 7n ww:8wp 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, what is *.x)vgn kjl(rrt ji5z hi)9k,happening to its acceleration, how does it change if air i*)xjz,jl(kgn95rvkt i)r h. friction is ignored?

  As a freely falling object speeds up, wh2 f ,tll4tz-gdat is happening to its acceleration, how does it change if air friction Czlft l- g4td2,AN NOT be ignored?

  An object that is throh vfbb-hd v5 6pcmx3c5((kiezb+q6 u3wn vertically upward will return to its original position with the same speed as it had initially if air resistance is negligible. If air resih 6mciv3kvf z5x b(qhebb( c-+ pd63u5stance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the same tiq*twe xl )rc9v38citz+)mzaoobosgr-2j 6 +4me.

  An object can have nonzero velocity and zero accet1rk s9)qq)rvqkw d,1 h4gcp)pv:tc+ leration at the same time.

  An elevator moving from the seconhws +n)y 5d 8w,o 13zwzk0infmd floor to the fifth floor making no stops along the way has zero acceleration all thei)fs, 8ymh nod1n+z5z0 3 kwww time.

  A rolling ball moves fromw8poau :3k9zg $x_1=3.2 \mathrm{~cm}$ to $x_2=-8.7 \mathrm{~cm}$ during the time from $t_1=1.0 \mathrm{~s}$ to $t_2=5.8 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.9 \mathrm{~s}$ is at $x_1=2.1 \mathrm{~cm}$ and at $t_2=3.2 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete l:v1 xvza k,3q yza;lh:aps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.8 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 hqn/lc8 *mj ezkkrw345 qc1s*,*htfl111 m away in 13.9 s. *q3*mz*tjwlkek1 ch nrfh8 ls45c, q/ It then turns abruptly and gallops halfway back in 4.6 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 ru3 :m7ewe pokv2 0f+ov9 i5ob$12 \; m/s$ to $24 \; m/s$ 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 from ffgd*6y-g8vtu luc0 rbp- o 35$19 \; m/s$ to rest in a distance of 83 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed oi;d7( 4bu ux 8xb12cqn1ahr nof $27 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to eq; 79cwym* iqxa7h4j3xg b6xo2iwn, bssentially top speed about g 7 3,qjiy*2a4ixnoqxx7c 6b;9b wm wh$10.2 \; m/s$ in the first 10.3 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 u1w/)muei+u kdh 0u s7speed of $18 \; m/s$ to rest in 4.01 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. Assumypcn) k1f ro0v3n s+kp7,s3d; o ky(pming a decelp7(+so n p;rdk3,mokns1 f0)yyvkcp 3eration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a trujprx3vex 4z/v9g+kz 85brxv -ck 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).    $m$