Suppose that an object travels from one poi hs)/+ue0ayi7ai xlk6nt in space to another. Make a comparison between the displacement and the distance tr 7ya a)i /k0i+ue6hlxsaveled.

  When is the average velocity ofh0.h ic,rnh 5ac,p8xl an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "f57iy9x a47dlz 2/uyh puqg-merom zero to sixty in 8 s". This is l49d5zq 7/-i7ya2u upg e hmyxa description of

  An object moving in the +x axis experiences an acc.o m0of)q ed9neleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow w7nj -lxl:*lhm*z7q.um xh5 idown as it approaches a traffic light. Make a statement concerning its accelu . 7i llw 5:zq*hnmm7hxj-*lxeration.

  Suppose that a car traveling to the r/iy:tljum bui*1c+ +//c1tp u 9aog bWest (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleratiotbi t/ +:1/ b*uic1jag9oyp/u lcmr+un.

  Suppose that an object is moving with a constant velw o iw7m319;jhrd.m+s c3gw bnocity. Make a statement concerning its h;1 sbd9 r7g mjc wno3iwm.3+wacceleration.

  If the velocity of an object is zero, doe:.-lmw nb;ljg n5y+1l(lm bues it mean that the acceleration is zero? Support your answemem-w l:+5l;1l(.jynbbg ulnr with an example.

  Can an object's velocity change direction when its acceleration is c 8ria6c;qx 5koh6mlx/onstant? Support k6xi6 h8;/m lqcrx5a oyour answer with an example.

  Suppose that an object is moving with constant accelera4/ rormk y+ stae,;/; baui.gction. Make a statement concerning its motionr st+ ;mak,b4o/ui/. e yrca;g with respect to time.

  Can an object have increasing spe;44 9pdxvxgloel.pr l 2hcg 2-ed while its acceleration is decreasing? Support your ansphg ;2p4d9crxv.oe2g- l4xl l wer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. (dby80v ; :kq*smakqmf3s5r m Make ; 0skmba5v3mqy8(r q d*mfsk:a statement concerning its acceleration.

  Under what condition is average velocity equal to the ave8ql).ow/cse j uaf61g:kmkc) k sz3 n6rage of the object's initial and ffs 3c8 agklu1z)jw /kqn)6o 6:cme.ks inal velocity?

  Objects A and B both start at rest.w9h )n2knd1 dw They both accelerate at the same rate. However, object A accelerates f)w9kn2d nd1whor 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 vbx) peg*loc95g i57qg x72hd start from rest. They both accelerate at the same rate. Howevei h7e)pbgxv9dcx2q5o 5lg*7gr, 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 restzseqt,6a:mn sik8(cd(1 w, mk and falls in the absence of friction, which of theas81m ,: s,(enkw6dmi cqt zk( following is true concerning its motion?

  When an object is released from rest and falls in the abn bd 0ukw275l*mat fo+sence of friction, which of the following is true concerning its + b *m lfwatn75k0dou2motion?

  Suppose a ball is thrown straight up. Make a statvo4k4 ulym +exuumzs-.x)*kljlyo7+ / h : i9cement about the velocity and the acceleration when the ball reachjylox i)9 llv+kmcxk+/4sy4o: 7*z-.muh u uees the highest point.

  Suppose a ball is thrown straight9vtuns5rlqf8ik b j14:tql0q , in3zm l0j 5p0 up. What is its acceleration just before it runr zi 0 q9v0l: ps5mjk tnf38b q410lt5q,ijleaches its highest point?

  Suppose a ball is throod4/qtmgg l ,+wn straight up, reaches a maximum height, then falls to its initial heighmg,l4 t q/o+gdt. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falgderz- iv-pnav8l.ah. fk+(; ls to its initial height. Make a statement about the direction of the velocity and accelerati- ap;ir8lg(e+n.fv.kvhdz a -on as the ball is coming down.

  Suppose a ball is thrownt n6ne dnfab) 3q1m;p- downward in the absence of air resistance. Make a statement concerning its6;1nd)pfat m3nneqb- acceleration.

  Suppose a skydiver jumps f 3s,vztvcjsc6i; aqt,emmx 6+ b)0 hw6rom a high-flying plane. What is her acceleration when06bva ;j,+tcszhe v6wq3)t 6c sxmmi, she she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An idenotknrd3 7w96 au75ck)dix l- ,voi(rztical 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 hi3aooxd5 cdtilnz( 6r k), rki-77uw9vgher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One secondpvykqk/ n wru; 2npf2;en) 6nf:(zyj8 later, ball B is dropped from the 8fn;uk yr) ;/j2( 2 e6vfnzy n:qkwppnsame building. As time progresses, the distance between them

  Ball A is dropped from the 7uuoor 9pw asp55:j :wk68u +9ldju watop of a building. One second later, ball B is dropped from the same building. As time progr55 oa 6w9w7uwr+j p9ljudu8s:oa kp: uesses, the difference in their speeds

  Two objects are thrown from theq va8xnwx61oxh+vv q7 q039r4qeo)b o top of a tall building. One is thrown up, and th 0x x3 qhov+)qqv1onowq79 x6b4 rv8aee other is thrown 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 building. A second brick is thrown stra+, fh/4qhswso ight down from the same bui,+ /sqshfhw4olding. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zerqta l5 gt)x y0dgs;c.g v:b*;lo velocity in the +x axis. The position versus time graph of this obje.td0t;gggy c;abvsxl:5l q)*ct is

  An object is moving with coxtk m8q:lc ctw ,,x flq9uks-hsn,;: .nstant non-zero acceleration in the +x axis. The position versus time grap8 sk;tx c ,fkqq9schu.,: ,l:tx -nmlwh of this object is

  An object is moving with constan e)43yrseu pr/t non-zero velocity in the +x axis. The velocity versus time grau3/r)pryee 4 sph of this object is

  An object is moving with constant non-zero acceleration in the +x axisq2zlw 1y 3/nr zw1eb3c. The velocity versus time graphy /2 bezq w1rnwc331zl of this object is

  The slope of a position versus time gvfj702 iq c ;rlb+rv4yraph gives

  The slope of a velocity versus time graph givesi iqk+0 csj9a:

  The area under a curve in an acceleration versuszv /mygog vyb p xa.,u/4u-3-l time graph gives

  The area under a curve in a velocity versus time graph * yy+w+w m-(l.ma wlwsgives

  If the position versus time graph of a81yudsi h+fh**pgo .e n object is a horizontal line, the object i1h*do8h pf.uy sgi+e* s

  If the position versus time graph of an object is a vertical line, : h3e7ngnhii*r 0ogb3 the object is hghbo *0ninge33: 7ri

  If the velocity versus timei hnhf g7tnx,f e* /)xxfg+70u graph of an object is a horizontal line, the object 7gx/ne,u+g fxntxf7)fh h* i0 is

  If the velocity versus time graph of an object is a straight lin6fyd1yi02a cjct -np 8 n+ev(ke making an angle of 30 d0 d+1jyp t6ay2nvfc(ck8 nie-egrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m souc,vf gc1so+:p th. Find both the distance traveled and the magnitude of the pf:+ 1csc,ogvdisplacement vector.

  A boat can move at 30 km/h in still watez z+z:-t dn gr*/rzkp;r. How long will it take to move 12 km upstream in a river flowing 6.0 km/h? k/zdrzz tzn+;:pg r-*

  55 mi/h is how many m/s? (1 mi = 1609 mdzm.0ft3 ri+m)

  What must be your average speed in order tom+l j2za- ,e4drr sfoh7s*,il travel 350 km in 5.15 h?

  A runner ran the marathon (appx)ka aabse5q w o6:98mroximately 42.0 km) in 2 hours and 57 min. What is the averagem aos:kx5e a9bq)w6a 8 speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 400 km0 n utm6m+hin-fp 88;/z wzkrv?

  A ly (light year) is t udzo1-u+mg2ml5f k8w he distance that light travels in one year. The speed of light im8 +lwfkdo2-mu5 zu1gs $3.00 \times 10^8 \; m/s$. 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 t5j1d;nrsww-g t:p 5g9zx rsy;he side for 4.0 s, how far do you travel during thpsw5t-yrwn;xj ; :d9r gzsg51is inattentive period?

  If you run a complete loop around an outdoor track (400 m+(c +*ofg dubs), in 100 s, your average veloc(ofdg+b*s cu +ity is

  A polar bear starts at the North Pole. It travels 1.0 km south, fo:, -ms8rtmpe valb(q cll4 ;p0zu51 then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This a1lp :m b4;ql vc-p8 s(fe, luz0mto5rtrip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travelsfmk7l) * c35:ivurklp 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 f7c )k:3lp m*lurk5i v45 min. What was the bear's average velocity?

  You are driving home on a weekend from schoolp l ih)su0t*r6 at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. Youhi*l us )r0t6p arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 1ft*w8khrz c- lu/88vt00 km/h. What is the average speed of the motorist for th8 lz/hrcu8t k8-fwv*tis trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is h.d l f7af53yjzer average speef57.dfyzlja 3d for the trip?

  An airplane travels 6gtrd qn cu g/16*ctd4at 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed fg/g u tcndqc416 *rdt6or the trip?

  In a 400-m relay race the anchorman (the persoqyeb5 z2u6r+tcm c(/yq ,5srun 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. 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 lyy u (qquz /5r be,rc+sct625mose the race?

  A car decelerates unifo3c+(x )oev9fel3 sch,sd0b ydic2 ar7rmly and comes to a stop after 10 s. The car's average velocity during decelerathc,d3+(9 sv 0b7o2ar3y) cees li xdcfion was 30 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the a k599 t-.k j:dfphyavtverage rate of tp:. 5j-f v t99khkayd$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceler 9 4q.qwy*nb82qsn* 8 anzgtzkates 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 acceleratan cvml6:.;yyes 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 constiq 5xtqye :u;m+e-r4 vant acceleration ofxq45 :y;qmuv+i rete- $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 4.5 m/s experiences a 9cw:uj 31z8w dnikv2rconstant acceleration oj39uni wzk:d1vc8 wr2 f $3.8 \; m/s^2$. What is the cart's displacement during the first 7.5 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a spekx/0j e-fb;w led of 596 m/s strikes a sandbag and penetrates a distance of 66.24 cm. What is the avee/ 0x k-jbwf;lrage acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launch)bd fwjbq(23 ced 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 the acceleration is constant, what is the length of the catapbc)jq dbf (3w2ult?

  A car starting from rest moves with evg( no2 mc9vgm 458fwconstant 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 xd*kl 3pbx2:w8 huz*m distance of 200 m. What is its average acceleration:pbk u*lw8 hxd x3m2*z?

  An object starts from rest and undergoes uniform acceleration. Durf4n/bqq c +;82mtaua2fttt* ying the first second it travels 1.8a/8 +tmbq22q;4uy catt*t nf f m. How far will it travel during the third second?

  An object is moving in a straight line with constan r3 hu nuhvov,/oc:z7wymj*. l (z,2tzt acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How faon r3zzz.c/2h*o,lmt:,ywu(u7v j hv r does it move during this time?

  A car starts from rest and a/xnm: pw k06zg+in 3ldccelerates 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 can decelerate at c(bbspny.4cpf x7 riu2jb306 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 li ;5f7k.vuixmight turns green, a car that has been waiting at the intersection starts ii.;k m5fv7xuahead 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 planetpaq;:2 6btsxhsr*o -d X where the accelerati 2o;:ad6p -tx*hqrsbson 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 plan f;iw-:3 ovkzmet X where the acceleration vifo;3km w-z :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 the sur )h4 qhvz3s4qxface of planet X where the acceleration due to gravity h h)s 43xq4qzvis $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

  An object is thrown upward with 8 :n(+fecmznpna 6 bl6a speed of 14 m/s on the surface of planet X where the acceler8pmnl zne:6bfc a(6+nation 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. If,yiz+9ayt7kuk: s6x dp( t .xk your friend holds a ruler between your fingers and releases it without warning, how far can you expect the r i9yk k, zak7tx6(s+xud:t.pyuler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity afj)lx8;sl (r wwter 3.008) ww;sjl(xrl s?

  A bullet shot straight up returns to its starting point 3z 4ujde 1a2vein 8 s. What is the initial speed3z4d1jvau2e e of the bullet?

  A ball is thrown straight up with a speed of 36.(ob-2yu gru 5m.,lwbxkwp69 q0 m/s. How long does it take to rbq 5gux 2y o-9r6.pmlbwku(,weturn to its starting point?

  A ball is thrown downward from the top of azm+w 6f-o+ z9zx,xr xu building with an initial speed of 22 m/s. It strikes the ground after 2.4 s. How high is the bui,9 zwf-+rmx 6o+zzuxxlding?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numericalx kz5u-j,;fnh3nd 8) ae f7oek value in the7 uek5 za;jo-ek)d8,3xn nh ff 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 speed of 31.0 m/k1r7s ofnyy.) 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 1 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 10 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 10.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velockh +lkyk*1k/is -*miabgw5 2q ity at t = 1.0 s?

  In Fig. below, what is the velocity at tp v z;bra3v5dof5pr; um2.dz. = 2.5 s?

  In Fig. below, what is the velocte q3v,;e sp8wc 4hxd0ity at t = 4.0 s?

  In Fig. below, what is the velocity admqn o7oi 5p gawz:a38kk0b48 t t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.nt 35ao o 1 1r2 l8zgc:l6hfk+a5ufxoq0 s?

  In Fig. below, what is the average velocity from 0 to 6.0 bvm 8+xe +f8pfs?

  In Fig. below, what u ga-q-e,ua i:7dmn.(jecx i85mv nit7km( ) ais the acceleration at 1.0 s?

  In Fig. below, what is the acceleration altnv wm5d 4rojd,j117 t 3.0 s?

  In Fig. below, what is the average acceleration fromuso+iyla* 42i 0 to 5.0 s?

  In Fig. below, what is the average acceleratiwk 6 *eo+/u s4jpng-kjon from 0 to 8.0 s?

  In Fig. below, what is the displachxdb xswo5:* / z+lz(vement from 0 to 8.0 s?

Does a car speedometer measure speedu, (c5mgxr8z p, velocity? {speed|velocity}

  An object can have a varying speed if pgcbp9hpcyf0a (/ +000flfh iits velocity is constant.

  The velocity of an object can be negative when,p m8 gxi q;kukt ;-+tud;c:tb its acceleration is positive.

  If one object has a gre 8;j ssgc:6ypadri a3irm6u0:pk,z*oater speed than a second object, the first must have a greater acceleratizir ppa863ad j miuy,0rogk;*s cs ::6on.

  Two cars emerge side by side from a tunnel. Car A is trave 4/vz9hmfbf.c ka ld:0ling 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 itswlull0.pw5- lu56 p vw acceleration decreases.

  A baseball player hits a foul ba u0ccrcbthgt.+ +o6-t ll straight up into the air. It leaves the bat with a hgct c.u0trcob6t+-+ 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, what is happening to its accelerffwib1lzdd*i . ,a)w ;ation, how does it change if air friction is ia. *i1ilww ) ,zbfd;dfgnored?

  As a freely falling object sp+aeyo-r504p mrw1 qyceeds up, what is happening to its acceleration, how does it chan-05 1 rwyqyr eoa4cm+pge if air friction CAN NOT be ignored?

  An object that is th5e48. rhqzi 8pcwkk.b rown vertically upward will return to its original position with the same speed as it had initially if aircrb588 h .i zkpewk.q4 resistance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zei m7jm 4o2gzvwly mgu4*8-*vxro velocity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero w(17oeya l- 4os (fpxe6bpg-o acceleration at the same time.

  An elevator moving from the second flo(qtx1 ebnmc(y*.n sk* or to the fifth floor making no stops along the way has zero accelerationnmnse(x*tqbc .( y1*k all the time.

  A rolling ball moves fr:: n0i( trec.4 njfnqs*f 2xuvom $x_1=2.6 \mathrm{~cm}$ to $x_2=-4.2 \mathrm{~cm}$ during the time from $t_1=2.1 \mathrm{~s}$ to $t_2=6.1 \mathrm{~s}$. 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 $x_1=3.2 \mathrm{~cm}$ and at $t_2=4.2 \mathrm{~s}$ is at $x_2=7.7 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete3fakdt1g;7 ixtmm 0 *f laps 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 4b bs)jq8 0 :tjb3hkcia straight line, moving 116 m away in 9.8 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate (a) its avb8 kj 0i)3bs4:thqc jberage 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 ku -m+wov35)ltr sqn3$12 \; m/s$ to $23 \; m/s$ in 4.3 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 fromax2ydt2;ia h. $20 \; m/s$ to rest in a distance of 58 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach )v yg,zaf*ct8a speed of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.2 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to es*8d.ojkkx( y n y+v*qshj:pxmz:7 d m7sentially top speed abou:*m7d kv7kdmqj:.yo xy8z p( s*xh +njt $11.2 \; m/s$ in the first 12.0 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 spegg qi r;)zg4:jce9aj/n;/ mrj wkr:x9ed of $16 \; m/s$ to rest in 5.87 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid mal4j1x yp//,s0sy hqprrks 92 m long on the highway. Assuming a deceler1 r/y/0pjq, sxpysh 4lation of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck g vn //qdx:l:1 fst5gsxoing $25 \; m/s$ 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 less than 30.0 min. After exactl)i brnu ,8ju57mwnly2wg qfw1ku 9t81y 27.0 min, there are still 1100 m to go. The runner must then accelerate )j f 12qgyl 58nn,w7uk18bwit u9wrumat $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$