Suppose that an object travels from one point il 4 rgm1+x2(izbtiyx 9n space to another. Make a comparison between the displacementb +21ymti(ri g4lzx9x and the distance traveled.

  When is the average velocity of an object equal to the /hz f+ 3ka+wujcy*rd9instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty inorokdqz4 /d+c:5e 9 ry 8 s". This is z+ro ocyq54k ddr: 9/ea description of

  An object moving in the +x axis experiences an accelerat4qg)-t- l vt))38sd/fl /oquzbuqdgnion of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) beginxxq+gyt*4347nnv ze; al2 kbv s to slow down as it approachlx* e+vqz;n43nb2x74 gvyk ates a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow dowux7 o*d:4j uuin as it approaches a traffic light. Mak*:4xd 7uoij uue a statement concerning its acceleration.

  Suppose that an object is moving with a constant veybvdg; 2 /uelj*dv8:elocity. Make a statement concb8 gv:yevl2 d;ej* /uderning its acceleration.

  If the velocity of an object is zero, dog-saf w(x,, lves it mean that the acceleration is zero? Sup ,vlg(aw f,-sxport your answer with an example.

  Can an object's velocity change direction when its acceleration is c;,x kjry 7fmm;tbc4wr6 (rwx3onstant? Support your answer wimmjk 6ryxtb wr;r,(w4f7 x 3c;th an example.

  Suppose that an object is moving with constant acceleration. Make a statement ymnt)3q zs;cjf+j* e-z(b*e f concerning its moti- + fnjc)qm;e f(etsz*yj*3zbon with respect to time.

  Can an object have increasing speedbb;i(; yeh0 eo.eos1mu:5b mx(g cnygl+,n9 t while its acceleration is decreasing? Support your answer wit. n (+eg1ybyi (: mctg e;m;onh5s,boux ebl90h an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of i2y vph30 8-uhr b.5b sqlvtjf6bg h94zce. Make a statement concerning its jh5fy2 z9bbv.rqguh 0st84 3p6hvl- bacceleration.

  Under what condition is average velocity equal to the average of the objewhpjhb6;8 mgq56 jz2 :bsgqs7 3 e8txrct's initial and final velo6tjjm88r6x;p qbh bgew3 qg5 s :2shz7city?

  Objects A and B both start at rest. They both accelerate at the same ratez c6*,p8ce4h8a l swtr. However, object A accelerates for twice the time as object B. What is the final speed of object A compar6sce8lzha, pt8* 4rwced to that of object B?

  Objects A and B both 1b08sz:ls p kystart from rest. They both accelerate at the same rate. However, oby:1szk l8ps0bject 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 absen;sd)a:linpswp fj4j ,+-qzm 1ce of friction, which of the following is true concerninqnws )p -zs j1m+djf;pia:l,4g its motion?

  When an object is released from rest and falls in the abseg ,-7zn klaj0qnce of friction, which o0an jql-7g,zkf the following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the9vm a2dhj5kzngwtrq t3n;06; velocity and the acceleration when the ball reaches 5;09 m23a;tnht 6 gdk rjwzvnqthe highest point.

  Suppose a ball is thrown straight up. fmnr/ t9r5e0 jlv;7 yj What is its acceleration just before it reachesf 9yn rtj/lrm05;e7 jv its highest point?

  Suppose a ball is thrown straight up, z*1e netdwk19 reaches a maximum height, then falls to its initial height. Make a statement about the direction of the veloc *w9k11ezd etnity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to itsw 7bc rwr f:karv32p9. initial height. Make a statement about thv:cf3 rw w2r7kp r.ba9e direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absenzt1l).: v krkulce+o,h60rabx; n-vnce of air resistance. Make a statement concernin vt0lan,:rl + zcb rx ;n)ovuk1h6-.keg its acceleration.

  Suppose a skydiver jumps from a high-flying petgbrx u(ux:/7 8 lpsqkf3/n8lane. What is her acceleration whe u3 (fk8gnx /e/l8bq7:urtpxsn she she reaches terminal velocity?

  A ball is thrown vertically upwazp* jx3b:x* nuv)gnq (aot4(nn6h7 rxrd with a speed v. An identical 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 m*tgvhux )ajnb7 o 3n4r6z p:(*nqx(nxany times higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One secon6oo9kl0wd xe+u,s f3 9(y9 u)peqbzgid later, ball B is dropped from the same building. As time progresses,x0os+)9 9( iuue gl9e6wfoqd y3k, pzb the distance between them

  Ball A is dropped from the top of a building. Op 9rr,qbks.2,+quuq a ne second later, ball B is dropped from the same building. As timqrp, bk sa .9q,+rquu2e progresses, the difference in their speeds

  Two objects are thrown from the top ,hdd rl *s(oj6nst.p7ipbm 31/scr j4 of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their spe7j. 4mohd3 6ts dbs 1/j(srp, l*irnpceds when they hit the street?

  A brick is dropped from the to;y88qvzfa :srqb :l5j p of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare theq a5zj8bsfr8q y:: ;vl accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The poxtx ux-4np5;br-u 8 nf +yukj,sition versus time graph of this objecu xp -r;5btxuu,j8n-n+y4 xf kt is

  An object is moving with constant non-zero acceleration in the +x axis. The posi7z/t(7 wnps8g fkjo,ymfj,a 1 tion versus tio71mn kgj,87a/, ( wyf zsjftpme graph of this object is

  An object is moving with constant non-zero velocit7bhol/n2 g 8zoyn 9rb7y in the +x axis. The velocity versus time graph of this object zn 2rh7l7 go8 9y/bnbois

  An object is moving with constant non-zero accelero;oq e*kpd50 vation in the +x axis. The velocity versus time graph of this object dk;e *o vqop50is

  The slope of a position ve/3p *eygxp 9aersus time graph gives

  The slope of a velocity versus time graph gives4)iv59 o krnpsa*h jm8

  The area under a curve in an acceleratic a v1)o9c*tplon versus time graph gives

  The area under a curve in a velocity vq4* dmf:jo-x, y a/24jklh9nevw -dnversus time graph gives

  If the position versus time graph of an objectxcwb:4sy t 5b+ is a horizontal line, the object it:4ycwb5b+s x s

  If the position versus tin ,hosk3p zwa1;s)x:so8 e+xbme graph of an object is a vertical line, the object ispw3s1:oo ,ab ksenhx; z8)+x s

  If the velocity versus time graph of an object is a horizontal line, thev vl*69q osyw p:b2bc1tmz6 7o object is97wb qtpo6cszlyo v21* vb6m:

  If the velocity versus time graph of an object is a straight vzio71g z5o)0a7c8jxxm rt k ,line making an angle of 30 degrecz5j, 7vxoxzr1om7k)g i8a0 tes with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m sp8 b :/xmj:ao8 -ljfjuouth. Find both the distance traveled and the magnitude of jbpx of 8jlua-/jm:8:the displacement vector.

  A boat can move at 30 km/h in still waze8 )yd7sg3t3iu j;wpter. How long will it take to move 12 km uiujzd 8t37;g3pe)ysw pstream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mx1qj2pnd+)gc* h -i dqi = 1609 m)

  What must be your average speed in order to;pxl2wav5rh*p y : 5lp travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 ho6+jj3xlhx:x v:l kfr1urs and 57 min. What is the aver hvl:kjfxr 1j6x+l:3xage speed of the runner in m/s?

  A car travels 90 km/h. How long does it tabd1j o0n q,pl1ke for it to travel 400 km?

  A ly (light year) is the distance that light travels ikk v-upm8 *v/hn one year. The speed of livh/-*k8 vm upkght 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 g /s *l8sue0nba straight road and you look to the side for 4.0 s, how far do you travel during this 0ngulsb8/e* s inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 st) f16zjhy wm,, your averatzw 6j1,fyh )mge velocity is

  A polar bear starts at the North Pole. It travels *)cidw)c9ky r1.0 km south, then 1.0 km east, then 1.0 km nort *ci )9ycwdkr)h, 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 Pole8oa9jsvr+;)uchar 4,-yy khapy j a/:dh qd2 8. 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 dhh syrh/ cv a:y2-, yj;uq8+94ako)pj8da artrip takes 45 min. What was the bear's average velocity?

  You are driving home on a wm1 ;5uwwqkf8 deekend from 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 far is your hometown from schoolqf5dmu 8; w1wk?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. W2qt1+ba mq o9km)x6 hzhat is the average spee9 mb2zqht6+ ka xom1q)d of the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her av5mw pxc9)k-c3n 4si x3n1qziferage speed fnp z5mis34qx cn9ixf-kw 3c)1or the trip?

  An airplane travels h5zl/e , mbk9oat 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the trip9eh zo 5,b/lkm?

  In a 400-m relay race the anchorman (the person who runs the last 100 m) for tearm(e6kpp ri dw:q7i10m A can run 100 m in 9.8 s. His rival, the anchorman fok76 wi01 p:prei(mrdqr 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 to a + oxk ftfr 5o4g*ox6p0stop after 11 s. The car's average vel4r6 *+xo of5 pogf0xtkocity during deceleration was 42 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 avesx+s d5b3h xp .q1(w+gz0b deyrage rate of b+3ex d 51wz.xq sd+(g pys0bh$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates atn3 kw,(i5qat b/( *rab 3drsga 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 accelerates a5r dv.s+-2hmv w z bu--zvuqg7t $4.0 \; m/s^2$ 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 const rji5)bc+(qqs i1 am2ag7qu) aant acceleratioiba5 uqcr+ajsqg a ()i2q 1)m7n of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 5.m; guo 7pav27c3 m/s experiences a constant acceleration ofv7m27ouc a p;g $1.8 \; m/s^2$. What is the cart's displacement during the first 8.2 s of its motion?

  A bullet moving horizontally to the right (+x direction) witq:qr, ec*i :vqy)al)hh a speed of 565 m/s strikes a sandbag and penetrates a distance of 23.57 cm.v q:q:*))ecqir,l yah What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapuls rxc31rg 4u/w8aec,h5 v*8 gxyq g;prt on an aircraft carrier. It reaches a speed of 42 r8c qg* r xv/cr53p;a14suwhxg g8 ,eym/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with const0v8h/arh9:mvl8 s:t- pav3o h1zgyh-y w8jlgant 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)s(j l;j7yzb d 200 m. What is its average acc;lj(d7jyb sz) eleration?

  An object starts from rest and undergoes uniform acceleration. During the -a hd(xfdo7/u first second it travels 9.3 m. How far will it trave/xfa7od- u(hd l during the third second?

  An object is moving in a straight line with constant acceleration. Initial sksj.x5j p2d45lhl*qly it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this4 52jhl j sl5psd*.qkx time?

  A car starts from rest and accelerates ;2qf o(o1m;k(fwe g zuuniformly 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 aboutdh/z+-rkg vzf+ii(l1 $5.0 \; m/s^2$ 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 waitij1i+x737l xe b,mdflcwg(:thd 0w:tw *xj7 ztng at the intersection starts ahead wigwm:e bl +d x ciwjd0tl7 ,73jxhz 7t*f:(1wxtth 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 mhi/ tr38u6c a95vehvm/s on the surface of planet X where the accel/ vvuhcr5a he6398tmieration 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 wh5etn-b- d.m38peidk );ph jspeed of 12 m/s on the surface of planet X where the acceleration mte-8d pb)j ph; ihwk-3d5ne.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 ik4,obtmb ,1u speed of 15 m/s on the surface of planet X where the acceleration due i1t mbu,,k4bo 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 spe/ 0l* lbun( 4fcf w4+ip .n;eq;iyurcied of 14 m/s on the surface of planet X where the acceleration due to gravity if4ln.fr;ip* u(nq l4+ by i ccu0w/ei;s $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater than 0.10 s. If+n-1uucx0 b wv your friend holds a ruler between your fingers and releases it without warning, how far can you expect the rule1uuwx +vnc b-0r to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its vea:0mu:z(rmafp xy 6of( r i;o;locity after 3ammrpfioy6 (uoa::f ;0 ;(rzx.00 s?

  A bullet shot straight up returns to its starting point in 9 s. What is)cq 23oom:/ce*fauz g the initial speed of thz3f*guq oc2ca:o )/m ee bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it tao mv,txcwv4se7r9*)ex +o v* f-*roxw2 wda v0ke to retuxc vot9 4ar,vv f*o+*sm xx o*7ewdvwr0ew )-2rn to its starting point?

  A ball is thrown downward from thb7+vir bqx,+,use6re e top of a building with an initial speed of 18 m/s. It strb,,7 i+xv sbqeu+ 6rerikes the ground after 1.1 s. How high is the building?

  A ball is thrown straight up with a speed of2p p+rrqw ;uz- 30 m/s. (only fill in numerical valz+2- rqp wpur;ue in 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 speed of 0d:6i) k (l pxz*leiok46.3 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 7 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 7.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocv:3*g; ehpp lyity at t = 1.0 s?

  In Fig. below, what is theeh 0qo)l0,ty s velocity at t = 2.5 s?

  In Fig. below, what is the 3z /iu9g)sfktz+ u5 7 zanva)cvelocity at t = 4.0 s?

  In Fig. below, what is the velocity at t nu4o)dujoe3:,l.j rf i o 6zx)= 5.5 s?

  In Fig. below, what is th zqm14)/b,jx ktzbb k+yeyz (/e average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity fjj q+v:a(0 bxuzidmo2c 9if9:6ep gi)rom 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 goez +.ht sa1*s?

  In Fig. below, what is the acceleratihb eeut8spylmfbpw b/). )o/6 )q. 4)eu1ezlwon at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0 s?9qn k-9:emfwt

  In Fig. below, what is the averag9xyp o/h s)k 8zkivt.8e acceleration from 0 to 8.0 s?

  In Fig. below, what is )54a0 p3hx mh hy aitg+9xhov,the displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velocity)6z8u k njw::n ff(zjw}

  An object can have a varying speed if its velocity is ( b.5 d9peo*8i3c redgjfta ,bconstant.

  The velocity of an object can be,9e* h-l ybvrd negative when its acceleration is positive.

  If one object has a great;:xq sr9aqzy, er speed than a second object, the first must have a greater acceleratioqa9: ,;xzsrqyn.

  Two cars emerge side by side from a tunnel. Car A is trax z8zp9l1eose9dvpoz. * b q;7veling 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 speedjwq .1lruf0qby/c* q9 as its acceleration decreases.

  A baseball player hits a foul ball stra q +7m(fe*w ft+bx9ukqn2z.g right up into the air. It leaves the bat with grq +e.km+wf n2 b*x7f(zu9tq a 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 obje ;ecyui(ro3zhwa (cs 0f48:y ect speeds up, what is happening to its acceleration, how doy8yeu(3 ae 4 oic(:;sfhwzc0r es it change if air friction is ignored?

  As a freely falling object speeds up, what is happening to its acceleration, hoia5 b -iln6vy nu5mhvj o(5*x6 65rjnzw does it change i5aibu 6i jh(vl-o *mnxj5 5 znn6r6v5yf air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to i.u 8lmk2yot w/aya 0f1ts original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, hyt /kal a 2.uy8owm0f1ow will this result be altered?

  An object can have zero velocityce hwz(+5zs th2r;5be and nonzero acceleration at the same time.

  An object can have nonzero veloc zj3klk:*ny a(/+-i5yx dufhd :vbyr2ity and zero acceleration at the same time.

  An elevator moving from the sec(hrxlks wr/; )a.5j ogond floor to the fifth floor making no stops along the way has zero a 5ja row(l)h.;r/gxskcceleration all the time.

  A rolling ball moves (;zlzxi d e24b4 kwkfk1 x3q9ly9u xf5q8qy:ofrom $x_1=2.1 \mathrm{~cm}$ to $x_2=-8.3 \mathrm{~cm}$ during the time from $t_1=1.0 \mathrm{~s}$ to $t_2=6.0 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.1 \mathrm{~s}$ is at $x_1=3.3 \mathrm{~cm}$ and at $t_2=3.3 \mathrm{~s}$ is at $x_2=8.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-mile (27 f6eii y,hg i4lz 1phzr-se2$1 \; mile = 1609 \; m$) track in a total time of 10.8 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 straigh o+bccia fa;4zx h)))t/ k2gmgt line, moving 108 m away in 8.9 s. It then turns abruptly)/amz) iac) 4c+x;g gtbh2of k 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 fro3 tmp1tis8i3e+2dm(;ml paxm9 oz 1ysm $12 \; m/s$ to $25 \; m/s$ in 4.5 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 fro54() ko7xn+vq iolmre m $19 \; m/s$ to rest in a distance of 68 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of k a d0)mym ae82tyvk4 fk 79mg6:ej*fn$25 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.4 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially lbjo-e 3*q:dotop speed about*j-od 3obq:el $10.0 \; m/s$ in the first 11.0 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 frf y0r:po rl b:)os.6lqom a speed of $20 \; m/s$ to rest in 5.91 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m longnk:c*7sp3nq(6 srorbi) n b8e on the highway. Assuming a dec epbo3k qr 7nrn68*(b:nicss)eleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truc b-9 lkwj2kv aoi)b1c-2i, ejdk 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-m r szp)tjb8z yq76*0nj: dmb h2nun in less than 30.0 min. After exactly 27.0 min, there asjnb bhmy tq6*0zjp2n z:7)8dre 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?    $s$