Suppose that an object travels from one point in -*bwr:voc/lrh 6jv35zsi2 g fspace to another. Make a comparison between the disb/-z:o3rw2l*6 vi vch5gr j fsplacement and the distance traveled.

  When is the average velociiaqj0 4z; b0n1o:ntvoty of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can4z2ilev e* ce4 go "from zero to sixty in 8 s". This is a d e4cv 2ele4i*zescription of

  An object moving in thec o06 j b+.: yiuvkognz-3p/ep +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 as i 1 k1pjnrx,,oit approaches a traffic light. Make a statement concerning itsx jkio,nr11p, acceleration.

  Suppose that a car traveling to the West (-x directionppc5ans1s(g wywu )oj h365x 8) begins to slow down as it approaches a traffic light. Make a statement concerning its accg h18ayupnc6wx)5( o swjp5s3eleration.

  Suppose that an object is moving with a constant vpciwbo x3b)yk.72 ub5 elocity. Make a statement concernin. b) pi5xk3u2yb7c wobg its acceleration.

  If the velocity of a t9g8xkl9e6 ntn object is zero, does it mean that the acceleration is zero? Support your answer with an exakt9xl8 g nt69emple.

  Can an object's velocity change dir+r*;kz/b-w . 1ghei2 lbpcvrcection when its acceleration is constant? Support yourr c1g2 e-bk/p.cvlhz* +wi; rb answer with an example.

  Suppose that an object is moving with constant acceleration. Msws33 krc (px ;1ve3dp,xr8nu ake a statement concerning its motir;e ck3 xunp3w3s,p1(d 8rvxson with respect to time.

  Can an object have increasinge o hurxw/;c k,4 cee-m07avk4 speed while its acceleration is decreasing? Support your answercw- kvxu meacke;7o, 04re/ 4h with an example.

  Suppose a can, after an initial kick, moves up along a sm b0cf *ps*s oe64jhb3 v;:ikbdooth hill of ice. Make a statement c:c3f* h06 osjbid4 bev b*ksp;oncerning its acceleration.

  Under what condition is average veloc3)1upbind)zq,, qe igity equal to the average of the object's initial and fneigd b,1u p)z3q qi,)inal velocity?

  Objects A and B both start atnsw cwpf9p*(0io 5gv9 rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the fig9f0cwp* wvp i9(5 nosnal speed of object A compared to that of object B?

  Objects A and B both start from resnv cx nl/) 2zlqc/6*t*zcf3 hft. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of c qn*c//f)z6xz3 tlclf *2hnvobject B?

  When an object is released from rest and falls in the absence of fricagtqt 2zxrdgb0 1/p4 9tion, which op/t40xzb gr2dqgat 9 1f the following is true concerning its motion?

  When an object is released from r6l f6xr9ofhwruu77 u9est and falls in the absence of friction, which of the following is true concerning its motionhr79 fx uw66uoul r97f?

  Suppose a ball is thrown straight up. Make a statement about the 3i;avw0wjy,c velocity and the acceleration when the ball reaches tyw;0w ,j3icavhe highest point.

  Suppose a ball is thrown straight up. What is its acceleration juszw1npt d f2)3hz veun8w8 (vjaj1e(g **qt3gkt before it reaches its highest poitvg3 udn(*w*j8pwv 18 (qe2)3zg k1z tjnfehant?

  Suppose a ball is thrown straight up, reaches a maximum height, tdg.w r+dq*6) r.jo hfqhen falls to its initialdg)od .+ rjqrf6q. w*h height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, rl a+0usq ) qnkr/gvw7d0)8xebeaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the bal w)sq7 +a0qbkdv8 elxu)0r/g nl is coming down.

  Suppose a ball is thrown down pnn zaep60z4 ebh/s/7ward in the absence of air resistance. Make a statement concerning its acceleratinn4pez0/6hap7 e /zbson.

  Suppose a skydiver jumpsk501l0klj ) f9/bbhulb 1when from a high-flying plane. What is her acceleration when she she reaches nfljk9bhwlb)1ek/0hu01 l5 b terminal velocity?

  A ball is thrown vertically upward with a speed v. An .a :dcris 4 i6b,8bxk3:xdviaidentical 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 the first bac ib8sax 4 x.b:,vdi:6rkdi3 all?)

  Ball A is dropped from the top of a bh19lrg +,/j wng (mozcuilding. One second later, ball B is dropped from the same building. As time +wlmogn(r / z h,j9g1cprogresses, the distance between them

  Ball A is dropped from the top of a building. One second later, bdh8 05vyl awv+all B is dropped from the same building. As time progresses, the differd 05v8w+hay lvence in their speeds

  Two objects are thrown from the top of a 7zo wcp8 w*r76lfq8 qstall building. One is thrown up, and the other is thrown down, both with thw 6wqf87z7o *clp8rsqe same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a ,5vph)430hi./ bvsy uu y;e kzu2lmsvbuilding. A second brick is thrown straight down from the same b;.yum yl0vsv h/5b)k z3i4h,vu e2psuuilding. 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 the +x axis. The p mk:nds-vm: h-osition versus time graph ofv::--m khsmn d this object is

  An object is moving with constant non-zero acceleration in the +xt)op;)-ngko n axis. The position versus ;npn)ok -g)totime graph of this object is

  An object is moving with constant + xceh )btxsi obe*+98non-zero velocity in the +x axis. The velocity versus time be+ stb8hecox)i9*+x graph of this object is

  An object is moving with constant non-zero acceleration in the +x axwo8:oxv1 mi63e6 rx ljis. The velocity versus time graph of this object io3emj iv6w8r1l xxo 6:s

  The slope of a position/nsc( 0h t(vvn;qhd7b versus time graph gives

  The slope of a velocity versus time graph gives2khw qvr06j3 lz(w we9

  The area under a curve w dc hnznxtq/h. 2v:,xfa.i,5in an acceleration versus time graph gives

  The area under a curve in a velocl+ppnt u +o*c/ity versus time graph gives

  If the position versus time grai wohi:fi8. r6d2 w j pbscq+ezt.30m/ph of an object is a horizontal line, the object istp 8:zce b w+rfjd0m.6wo3 /ih2 iiq.s

  If the position versus time graph of an object is a vertical line, the objea/jg v .;mm4-vrr 9roact isa4mov/j -rar;v9r.g m

  If the velocity versus time grapr77f6po/01ie; mbszxrdhg7m h of an object is a horizontal line, the object i rxp /;d6s1 ihmrzgf0be77om7s

  If the velocity versus time graph of an object s4le dkg:lf95 is a straight line making an angle of 30 degrees withlkd4feg5 sl9: the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance tra p.q8.ov0ftp-m-vs4egv7 vlw veled and the magnitude of the displacement 8lvmg -sf0v4wp7tv-op v.q .evector.

  A boat can move at 30 km/h in still water. How long will it take /jmix w;.q,luto move 12 km upstream in a riv,l;ij. m x/wuqer flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 m)dg;qfx sqaaf/ 2ez (;:

  What must be your average speed in order to travel 350 km inwq7ywuj 3(w4 n 5.15 h?

  A runner ran the marathon (approximately 42.0 kmo. dc7cr5y2 erb3b (cm) in 2 hours and 57 min. What is the average speed of the runner incy3d52eb rrcmc o .(7b m/s?

  A car travels 90 km/h. How long does it take for it to travel 400 km?lretx* 55 if1t

  A ly (light year) is the distancv w+z bx 4y-ec7k1gtk2o-z-) xv+c dyte that light travels in one year. The speed of l4 xe1dtyg++ckx )t7o- w-v2z-vczkyb ight 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 gd/1nj:yad1p along a straight road and you look to the side for 4.0 s, how far do you travel during tdd1 1g/: ypanjhis inattentive period?

  If you run a complete loop around an o ee,cjrc0azi2h88d z.i/ cz+t utdoor track (400 m), in 100 s, your average velr jzc8e0d/i+2,h ccte izza.8 ocity is

  A polar bear starts at the North Pole. It travels 1.0 km souton4 ojg;-u5pmhxlumg2w a:e2c/ 6f 8fh, then 1.0 km east, then 1.0 km north, thenec mu g/lhg;:w4p-uo6 a 8f2mfo25jxn 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 trd)djeh* z c/bqti9n,zijq28 -avels 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 i e /qzjn-c2 z8hb*d9,dtqij). This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school al f(p8-emghw4 oe (vu0t 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 o (mfw(8 lu-g4vee hp0far is your hometown from school?

  A motorist travels 160 km at dmnd+(j:ygbzlbv8g4km3z e5ec 078sq(u -u w80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this trip?( 7m4bzey5 :wg38d u0j zdskbqg-nlv (c+u8em

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. i tkk7 w:h5svc:.kqj 3 What is her average speed f:.7v:hikk cwk5 3tj qsor the trip?

  An airplane travels at 300 mi/h souths wuurl+ r3b5,s5bld ( for 2.00 h and then at 250 mi/h north for 750 misls (l,u r3u5+d5rwbbles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs thqtbv; i4c+4 khaa 4ga;8;uyrpvq6h3 je 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 runner noai+ar;cavyhhb q8 4 gu vpk;;jt4 6q34t lose the race?

  A car decelerates uniformly and comes to a stopzlg: hj2l,oudv/38pq evg83w after 10 s. The car's average velocity during deceleration was 68 km/h. What was the car's deceleration d,gjw8puo ve 2l/zq8:l3h gv3while slowing down?

  An airplane increases its speed fromvm60uz(wa *:fo kkt):w w xzy+ 100 m/s to 160 m/s, at the average rate of y k):o6xfwvz z*u(mw0+k :taw$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the 616p8u7 +ghldtgyvbbwfi06 y +x y4a urate 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 acw2 ns 5h9 e.,5pmhzgsnd 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 dj s ;o( )vugwde93g4kthen speeds up with a constant acceleration9)dv4osw( ggd;kj 3u e of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocr n) av2e;k:sd.qc2 rq vxj:h4ity of 7.6 m/s experiences a constant acceleration oav.4r kj :r v );xsn2ed2hcqq:f $4.7 \; m/s^2$. What is the cart's displacement during the first 4.4 s of its motion?

  A bullet moving horiz3jh8l6ufdr l2 ontally to the right (+x direction) with a speed of 242 m/s strikes a sandbjdflhrl62 38u ag and penetrates a distance of 19.74 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched fb2f*b ;9z+grb pi:fqnc)sp qep 7u,/ srom 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 the acceleration is consqbu c*29fep s:is+ ,p b z7qbpf)/rgn;tant, what is the length of the catapult?

  A car starting from rest moves with consta,nt6l:-fp nfdt7ju. gnt 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 t 5yxwnp;::m aew vtn-7o 80 m/s in a distance of 200 m. What is its average accelerap;5w7va:- ynmt ew:nxtion?

  An object starts from rest and undergoes uniform aclfy b: 0g9s+w:y t3r zxnm6igypw:98z celeration. During the first second it travels 5.3 m. How far will it traven 9:8ygsybi zzrtwlx0 y3: 6m:9w+pgfl during the third second?

  An object is moving in a straight line with constac :izrpffu)kf4u*6 v;nt acceleration. Initially it is traveling at 16 m/s. Three secondsf6 )zrfukucpi*v 4: ;f later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accele:trzo m+y:)miq 6)vvbrates 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 road c0cgvv4 l3yn e y;((/kslp +8 p,elocfjan 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, 4meec3)al gzywj 2.p1a car that has been waiting at the intersection 4.zl1ae2)3pwjg cye mstarts 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 vy;o; xt4o n;pa73kv 7hyn8pewhere the acceleration due to gravity iypnk;7 x; 8t3vanhovo;47ep ys $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of vqd2 f 8y1byr13nmf. sqq;f8e12 m/s on the surface of planet X where the acceleration due to gravity is vy ;3s81qfr m2bqqyd8 e. f1nf$1.5 \; m/s^2$. 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 tygar+p c n wnu,m+- k66dtt*zz9b2u,ihe surface of planet X where the acce 2nd6k6ar +z*,ti +tymz9c- u,u gbwnpleration 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 plafkuja;1 8vt; pnet X where the accelerat 1vkf8apj u;;tion 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 ti3mv i3gh z47)nsdorr2,b )jc han 0.10 s. If your friend holds a ruler between your fingers and relrihm d n,s2g74jor)zic 33)bv eases 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 vel7db+bcgvoiyj *i : /w1ocity after 3.001bg7 :wj b/yvii o*+cd s?

  A bullet shot straight up returns to its starting point in 14 s. What is thx6nbn7lzwj/)) v ,nez e initial sp 7nz/ejw)zvnbx)l6 ,n eed of the bullet?

  A ball is thrown straight ud/dkqk,dlbdd 3 nhbq o9,s 4)-p with a speed of 36.0 m/s. How long does it take to red kdd4/ l-o3n,dbd bqs)kh q,9turn to its starting point?

  A ball is thrown downward from the top of a buildi bt02cwhy1/qpp1 m*n bng with an initial speed of 18 m/s. It strikes pqp 0nth m12w1*byc /bthe ground after 1.6 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in uc8-eia m-u6enumerical value in the blueei-6mca -u8anks)
(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 46.3 m/s. (85oe0 soj zc.ku:c yzbr/v 1dz13a/yuuse $g=10 \; m/s^2$, 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 12 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 12.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velociqln/qr f48d ve,guzos-ai17 ,ty at t = 1.0 s?

  In Fig. below, what is the velocity at t fcg /7; bt(hkl= 2.5 s?

  In Fig. below, what is the velocity at t = 4.0 0t h5a4oi1zy 3jiq-l 2y6hz ;qdhhb1us?

  In Fig. below, what is thnzq,uf/ h*/iwe velocity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0b0hzr5ex n8 p1 s?

  In Fig. below, what is the average velocity from 0 t y1jjncsn 8zxm .*;p5do 6.0 s?

  In Fig. below, what is theg9a (nhvo ud:c0/wsu, acceleration at 1.0 s?

  In Fig. below, what is the acceleration tu1 (gxx* rs7v,n7yhxat 3.0 s?

  In Fig. below, what is the avera f6, )u;gfl *7gtoff aoku20poge acceleration from 0 to 5.0 s?

  In Fig. below, what is th.1u6vfu n w.bye average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacem;kb x2nseu.gh9 0 :hdffshq0/ ent from 0 to 8.0 s?

Does a car speedometer measure speed, velocity1 3* 1bbwi:bswry ol/f? {speed|velocity}

  An object can have a varying speed if its velocity is co1 :m+1 afm81 wuwhwpju3rn t3q+yc .honstant.

  The velocity of an object can be negative when it)wzx8:;5oklrfk3z y ab74 (yn:umvybs acceleration is positive.

  If one object has a greater speed than a second object, the lzjqxf/ )b2 r 9l2hh)zy)8m lefirst must have a greater accelerat9ml/) jz)xe h)l2h2 rq fbyzl8ion.

  Two cars emerge side by side from a tunnel. Car A is traveqgo9a 50 ni t0yu9:xj3 tu5pagm,mw +mling 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 : 8o:4pfv0es7ixstb ras its acceleration decreases.

  A baseball player hits a foul ball straight up i:c(rfo0 8 n6g +isqrhtnto the air. It leaves the bat with a s+ir shfc68oq(:ngrt0 peed 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 speeda9 fmb*ih9m3wv+, cvorw* 5 ncs up, what is happening to its acceleration, how does it,9hw v+*b9 3rafm omncv* ciw5 change if air friction is ignored?

  As a freely falling object s1d x3h.qq zl0jpeeds up, what is happening to its acceleration, how does it change if air friction CAN NOT bj.1 lz3xqh0d qe ignored?

  An object that is thrown vertically upward will return to its original position xcg6 (m +dvcs 07gti ivkq0d)f.; vwg8with the same speed avic78 d;0mf)wsq6tkigvd(. vg0gx+cs 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 the same wa/52nbpzpfqy/ h1*xtime.

  An object can have nonzero velocity and zero acceleration at the same time o3lyf1p8fp z..

  An elevator moving from t:)7mrdy;ri 6 meqf l.on:hio*he second floor to the fifth floor making no stops along the way has zero acceleration all the mi7if:ynm.or)hdeo :rql ;6* time.

  A rolling ball movesu8e*a* pp)i++ pxhl xl from $x_1=3.0 \mathrm{~cm}$ to $x_2=-7.1 \mathrm{~cm}$ during the time from $t_1=1.4 \mathrm{~s}$ to $t_2=5.3 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.4 \mathrm{~s}$ is at $x_1=2.6 \mathrm{~cm}$ and at $t_2=3.2 \mathrm{~s}$ is at $x_2=7.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete lappf-6f (kez j/po :xxwp g2.w9:/eaowa s around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.1 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 lineef;x12t19,mucydlz8c lq * df , moving 95 m away in 10.1 s. It thuf; fmxd9e8cyl*c2q1 d z1l,ten 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 .u(g eqtwwu(n90c5 im $11 \; m/s$ to $25 \; m/s$ in 5.6 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 khl/1i) 6+d/vu :mei6fweqsq$16 \; m/s$ to rest in a distance of 72 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of+9(+nshjb0 8aej rob p $31 \; m/s$ 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 of the blocks to essenticen /epwn(*ey+4z v-d x-3hywally top speed abou y p*wxyn-c- zh3e/v+e4wen(dt $11.3 \; m/s$ in the first 14.8 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 uniformly from xcssljm5 kcu3-7fd . 2;uk o/oa speed of $15 \; m/s$ to rest in 4.38 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. Assumin v mqn4 *sya9l/dj)ud1g qad *l d)vum9s/ yjn41a deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tr2)x,x+nv : kachdkvw0 uck 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-mle3w:ytjedl5xed)2 6r ql* 8c run in less than 30.0 min. After exactly 27.0 min, jd3 2cee*)l:x8lwqe yl6rd5tthere are still 1100 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$