Suppose that an object travels from one point in spa3kbyqt))i l ytif9c *7b:pi-vce to another. Make a comparison between )7iyil cv y:kb 9 *pitb-tfq)3the displacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous velocity? yh,l ele*k,z pbh3w4/

  A new car manufacturer advertises that1c *w*4o g)q(h smns-gysvb4x their car can go "from zero to sixty in 8 s". hsmvo14(b*gn x-w qgc4y)s s*This is a description of

  An object moving in thjs + kn;7txiu)e +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 m)jbpoa y7tz ,q72hr( as it approaches a traffic light. Make a statement concerning its accez( a qbrh7 2ptj,y)mo7leration.

  Suppose that a car travelingw7,gdek uj)1cbv r 3h; to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement c ;gev3b)h1jdw7k, urconcerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statement cbe05/xjb +li qoncerning its acciljqe0b xb+/5 eleration.

  If the velocity of an object is zero, does it mean that the acceleration is zer)yw)f:/ j zktxs/r tj;(5qih wo? Suppw5w))t/th f / y:izxs;jrj( qkort your answer with an example.

  Can an object's velocity change direction when its acceleration is cofr;zwo2(wy (eke(/ ln hz f98bnstant? Support your answer with an example.kr2ez(hz/8e(wl9 n b w(f;ofy

  Suppose that an object is moving with constanthg bpz 7/pqs.2 acceleration. Make a statement concerning its motion with r2s .7/gh bzppqespect to time.

  Can an object have increasing speed while its accelexh/yib,b6izt9zf 2z0pne l:2ration is decreasing? Support yoei2/it :pzzy xhb9ln0 2z,6bfur answer with an example.

  Suppose a can, after an initial kick, moves up along a:1ew;t6z*cx h i;s ix0qxpds - smooth hill of ice. Make a statement concerning its acceleration i:xpws01i6zdc eq;-x;st hx*.

  Under what condition is average velocity equal to the average of the object's i8d)wz)85mocwoy yn2 dnwd8 mycyz)w) do5n2 o8itial and final velocity?

  Objects A and B both start at rest. They botnie r*p.ytph,3t 68ah h accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of o.p*r8ap 63tiy,e htnhbject B?

  Objects A and B both start from rest. They both a1l( t6f:b .hhu)qa tfnccelerate at the same rate. However, object A accelerates for twice the time as) nqft h :(6fabhu1t.l object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest ar+gmpx r,e2 o/0i*qp9 i yb5abnd falls in the absence of friction, which of the fo5p +/a90 g2*y,iqbirmb prexollowing is true concerning its motion?

  When an object is released from rest and falls pw ,rv(*ognroro-2z9r w84uj in the absence of friction, which of the following is true cor2vrog49-8o on rw(rz*j p,wuncerning its motion?

  Suppose a ball is thrown straight up. Make a sgoqv0qq:)nzews 17+ yvpus hw .2,. zwtatement about the velocity and th .:+hsqpyuz7e 21.vw wvsqnog 0w)z,q e acceleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration juswfm8jw b)m*, ft before it reaches its highw*fj8 )f mmbw,est point?

  Suppose a ball is thrown straight up, reaches a k(w1v1;t uhg+lbi t4w9ms- xr maximum height, then falls to its initial height. Make a statement about the direction oi+ -tt4mgu9skwbh1(lxw v r;1f the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to pm n c(1hd40.2oq pjpwits initial height. Make a statement about the direction of the velocity and acceleration as the ba nhpp4(o2q mjwd10.cp ll is coming down.

  Suppose a ball is thrown downw/ jxlc;5 kywcj7zpau ,;fi,h) ard in the absence of air resistance. Make a statement concerning its accelezhx;)ylcck/i; w7a,u5, jpfj ration.

  Suppose a skydiver jumps from a high-flying plane. What is her accelerationnp,0k*x mq v1ylu z(9)yvw9wa when 1 ( l a)9xkv*vqm0wup9nzyyw,she she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical se6hw, -uj gjp+ncond ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of j-wpn6guj ,+h 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 * 6/ zyslttx/gof a building. One second later, ball B is dropped from the same building.ygt*lt/ sz/6x As time progresses, the distance between them

  Ball A is dropped from the top of a buirt bvt 1n/,pg4gq:iw+6mwdp:lding. One second later, ball B is dropped from the same bui, g6:q gwwrb t1vndmt/i+p :p4lding. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall buil2ek ecjwuu/ egoow/f*vm y 0u87p+6r2ding. One is thrown up, and the other is thrown down, both with the sa8wm ej2+uy * e/f ec27 uuprv0o6gwo/kme initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brickdmt2 b2+2ve lh is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerathtm lbde2+2 v2ions of the two bricks.

  An object is moving with constant non-zero velocity in the +phw 8 hbm,ep e (-k8vc,ri-wz(x axis. The position verpz, wv re-w8h( -,cibhm(kp8e sus time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. The t9gdfld ll2s(:cvx51 position versus time graph of thld(2 ts15dvclf :g9lxis object is

  An object is moving with constant non-zero velmy9* 6ep0vt2w;q jdo docity in the +x axis. The velocity versus time graph of this obje ;*jw6 dpetdq9moyv 20ct is

  An object is moving with constant non-zero v:j8 npnd qcf7-79hubacceleration in the +x axis. The velocity versus time grapjucbpv9d78-7 nnf qh: h of this object is

  The slope of a position versus *uwl8-/mvs y ltzj kv 7rht8hu8 /9/mltime graph gives

  The slope of a velocity verst4u2em ) cqi1yus time graph gives

  The area under a curve r xhllrcq:x56 8vua .2in an acceleration versus time graph gives

  The area under a curve in a velocity versus time g acfuk7x,9bl r8 5p- ;ekxru-lraph gives

  If the position versus time graph of p.ys8 f sxi5yyj+b. d1r*fnp9an object is a horizontal line, the object ix y9ny5*pp8js.fds ryfi. +1bs

  If the position versus time graph of an object is a cbumv0lq8o i:((s0pvvertical line, the object isb(os08q cl(v0 v:pu mi

  If the velocity versus time graph of an object is a horizontal line, the o*6boy.j t(j(p7 ylca2/mny/ ccv jqz7bject isb* 7v. zjj/y6aypq ylo c2/m((j n7tcc

  If the velocity versus time graph of;co*0hat ;5v wfgkcc. an object is a straight line making an angle of 30 degrees.cct kafwv*c;0gh5 o ; with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the dilbl p8 h pqv.-6 jvnl)-v1*jbnstance trav )l b1*hlpnlj-vb. qn v86pvj-eled and the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How lon:o-jc);ksy cbm1-r hn g will it take to move 12 km upstream in a river flowing 6.0 km/yr1) oscmjc- nk:b -;hh?

  55 mi/h is how many m/s? (1 mi = 1n5 m vc93;.7b rtlekcy609 m)

  What must be your average speed in order to travel 350 km in 5s-rc ;4xuz xj4xlrq8ohf9 +.v.15 h?

  A runner ran the marathon (approximately 4m y -t-ytcgnx.wol1t*zx8q7+ 2.0 km) in 2 hours and 57 min. What is the average speed wqmtz txcx*+n1yo-y g.t 78l-of the runner in m/s?

  A car travels 90 km/h.n of gix8wq6 h4 2ttah2-gsv8*pwgc7/ How long does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. The sp;s6nyivw9 w48o* zc sveed of light z i cos8v;ywvs9n*6w4 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 7 7;/xt3ww0gqf fxd f3jt cfg(l ek)5v+2 km/h along a straight road and you look to the side for 4.0 s, how far do you travelfgf3+;xtdqgek vw( fw 75x3cj /)0ft l during this inattentive period?

  If you run a complete loop around an outdoor track (40pucy2wm9v(y) v7d- f c0 m), in 100 s, your average velocity isf vdw vcuy2-c)(9m p7y

  A polar bear starts at the North Pole. wlm 9ntz80o99kuwx6yIt travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to it9 x0kylomw9uzn 968wts starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It travels 1.0 km souwq1i /*mdf6nm th, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takqmf* in/w 61mdes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. It th0;r shm:6(eeuql4vk2 sqz f 4ven starts to snow and you svuk4f(6es q ;hm 4e zvql20rs:low to 35 mi/h. You 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 100 km/h. What is t6ekeru6 ,qq2vhe average speed of the motorist 6uk,evqqe r62for this trip?

  A motorist travels for 3.0 hlqh xa.0kg-l 1w-rlmp5 d(pf2 at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the tap--. fd1kq0(m52hl pgxwrllrip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h nortc42sgcybg g6u5r( mpfu*-q *oh for 750 mil*smy6fc gqu2o45ur gc(-p g*bes. What is the average speed for the trip?

  In a 400-m relay race the anc wsv e sig;qmuw+3c/ (u3h /xlz-,qa0whorman (the person who runs the last 100 m) for team A can run 100 m in 9.8 ww l(ume;vc - as/+sgh qquxz3w03/i, 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 to a stop after 11 s. t0lgdzky ek)hn7p9,; 8qr2 n eThe car's average velocity dure97y,p z08kt2h) n; rne klgqding deceleration was 73 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 average raxjfrtj.j 4**x te of *x*t f.xr4jjj $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accel0ojwxob*)c 8fuh(m z *erates 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 andmp(qe ljwr.ga *(39.:csxkon 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 speeds up with ad. **x) v pqd9ulx3kaifqo2 s5 constant accelerationp9 * x xl*dv2 .u5as3ofdq)ikq 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 1.2 m/s experiences a constant accelerationn so xw+to7 -o(wa*kv4k.pm(f of4mv t.kwnpo a-7s(kw+o* ox(f $3.2 \; m/s^2$. What is the cart's displacement during the first 7.0 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speyhf/je4,dlxt+ u1z7gv . cyu:ed of 202 m/s strikes +t.uh7l, c jyydvug:4efz x1/a sandbag and penetrates a distance of 86.91 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a cu(sa09g0xaj v-2 cxq*ozc: z fatapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requiv2 ozxgc 9-x q:fsz0*uaac 0(jres 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from restv*ps( w-pbz:mf yp 74t moves 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 200 m. w4g(pxlz xk2q*d. gm + What is its average accelqx4+d2kgg mp (w*lx .zeration?

  An object starts from rest and undergoes uniform acceleration. During the firkf/f2wfy 2u4hpl -ic 2st second it travels 8.3 m. How far will it travel during the thir-k/y ffl2ch uif2w2 4pd second?

  An object is moving in a straight line with cx,. b2f5mayrgonstant acceleration. Initially it is travelinbf rya5m2,.g xg at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest 0a. qvqwhxy0l57p2lccjvqpfk a- ,30 and accelerates 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 deceleratehg;,vyrzl 81 b 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, a*3ykfrpw(ap-r ;j)ad ,*lu jq;8qdcz car that has been waiting at the intersection starts ahead with a cons rdpr-)*jpa z c(djq;8 a,u*kw;f 3qlytant 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;cv7n:x 9nixg fl* ti:xhof1 9 speed of 12 m/s on the surface of planet X where the acceleration due to gravity i1x*itf7h 9fxn9vg:ol;n xci: s $1.5 \; m/s^2$. 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 planeva6,uxozrqcz9/ m mz u *(**wnshp (3qt X where the ms,9*uv3/c *pq 6oz zrmza*qhuw( (nxacceleration 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 surface of planet X whexba x8jj135eo/gxl8 8;l- 2naf y zpfare the acceleration due to g;3y8zxb-8 lpog 1ff/aaxja n5 xl2e8j ravity 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 planet X w :/ohrs 9dxtx6+jusy/here the acceleration due xs x6 hy+rd:t/j9so/uto 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 your friend.v)iaoem5n c, holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it?.5oc i)v enam,

  A ball is thrown upward at a velocity of 19. .s19t lghkt p4.0 6nsp3vkcnz6 m/s. What is its velocity after 3.00z1c tv.pnn lgs6904 3shk tk.p s?

  A bullet shot straight up returns to its starting point in 16 sm5 -.wt,fp edu. What is the int,- dwufmp5e.itial speed of the bullet?

  A ball is thrown straight up with a speed of 36x ;pv,*gbrd7n1 nun/ a.0 m/s. How long does it take to return to its starting poi/ux*p ,1;v7bdnn ragnnt?

  A ball is thrown downward fromm l4jd2r r a+-bk/uje8he1s2 h the top of a building with an initial speed of 17 m/s. It strikes the ground after 7.4 s. How high is the bui1r2rbl /mh 42 j e+-hesda8juklding?

  A ball is thrown straight bv2xo+au99o).mc n7 n+ (r (bnjvdipk up with a speed of 30 m/s. (only fill in numerical value in then nd9nv++)2xvi.7cbapmuk ob9rj( (o 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- /d ;sn2sktke air with a speed of 37.0 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 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 ku 2p wn;h*i/wxq,(ha the velocity at t = 1.0 s?

  In Fig. below, what io.dooc 1dnx0lr.fv8x:c uu,,k;x)wr s the velocity at t = 2.5 s?

  In Fig. below, what is th (2yeir(g)8 ii 7hjqzje velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t d:t k5d*+ khm:3xdb kl= 5.5 s?

  In Fig. below, what is the average velocityar7q3 ks5.d;8pjm-fvbeg9 b f from 0 to 4.0 s?

  In Fig. below, what is the average velocityx+d pu)b;w z.bqa7g( i9w8jtog/e0xd from 0 to 6.0 s?

  In Fig. below, what is the acceleration7ya l1ge.; djb at 1.0 s?

  In Fig. below, what is the acceleration to4kpgw ojjb12 errh927f9v+ at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5. bf/tivv*fw0.0 s?

  In Fig. below, what is the average acceleration froe52g 0k( ivz0eadrj.n m 0 to 8.0 s?

  In Fig. below, what is the displacemf)k h zbfi3s/mi)q,+yent from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velomh;a7jw c .0egcity}

  An object can have a varying speed if its velocitggbo/ . xwz(l ilz3ltcyj+1/+y is constant.

  The velocity of an object can be negative when its acceleration is positx (-nyoqc1ff6 yks; i,ive.

  If one object has a greater speed than a second object, the first mustrj3 :h5*cffmu have a greatr5f3h*u: jmc fer acceleration.

  Two cars emerge side by side from a tunnel. Car A is travelinh.q1a, vqf.e kg 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 4befg* dlex71 as its acceleration decreases.

  A baseball player hits a fo47h4fueqgdhy fqq+ ,1 ul ball straight up into the air. It leaves the bat with a d7f+eqqfg4h 1,h4y uqspeed 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 g, l1ut zz(l9macceleration, how does it change if air friction tz gz 9lm1(u,lis ignored?

  As a freely falling object speep0 s1set1)*4xhujaz b ds up, what is happening to its acceleration, how does it 10heb)zs *a4xjt s 1puchange if air friction CAN NOT be ignored?

  An object that is throgxnz5evo9 -k68e.tfk.vb)ane2n a y/ wn vertically upward will return to its original position with the same speed as it had initially if air resistancea- 28vn6)y. e5nk e f/t9gabkeonz .xv is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleq*a;o 7w8w(d slci4zz ration at the same time.

  An object can have nonzero velocity and zero acceleration at the same +e 9,,vnp tkzotime.

  An elevator moving from the second flo*u5t33edn54 9wvzxywp u s,cu1 hg6ee or to the fifth floor making no stops along the way has, z95 h5dsg6 eexwpne1 wu 4tuv*y33cu zero acceleration all the time.

  A rolling ball moves from k+r.cdggnf1 3 $x_1=2.5 \mathrm{~cm}$ to $x_2=-8.1 \mathrm{~cm}$ during the time from $t_1=2.2 \mathrm{~s}$ 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 $t_1=-2.1 \mathrm{~s}$ is at $x_1=3.1 \mathrm{~cm}$ and at $t_2=4.4 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete w,zdqv/w 2hh evg1;wa9q g:3b laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 12.3 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 100 m az0naz tt -0j ikjbr,.9way in 12.6 s. It then turns abruptly and gallops halfway back i 9z0tjn.-arzjkt0 ,b in 4.5 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 frpwo 1m rf5q pg5qnrkog,0rl. +qy244u om $10 \; m/s$ to $22 \; m/s$ in 5.7 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 7 (atbvf6db0d$18 \; m/s$ to rest in a distance of 83 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must rqb9o h5arx6w l oro3(buf;tm4cx .3l) each a speed of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.2 \; m/s^2$ ?  (数值)  $m$

  A world-class sprint./ly66fugk nder can burst out of the blocks to essentially top speed about kdulg f66y .n/$11.3 \; m/s$ in the first 10.7 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 speedbwzo3m4( q26 gxx( esa of $17 \; m/s$ to rest in 5.56 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a cgrmlas p6. :zjr2;8vsar leaves skid marks 92 m long on the highway. Assuming a decelera v r28:lgm;zr ssa6p.jtion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tru3p /4 q(;ez3qjqe 0h mrve;dbgck 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 complet / hrxw 2iby)/(5lque0h/ usxqe the 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then accele u b/2qqe/yuxhhs) i lwrx05(/rate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$