Suppose that an object travels from one point in space to ano lob*e7 q2ewd,,*eh swther. Make a comparisdqb, 2wlo w*seee,7h *on between the displacement and the distance traveled.

  When is the average velocity of an object equal to the instantaneous velo uqk5ll ycub*i a-)z5vo7 x,o5city?

  A new car manufacturer advertises that their car can go "from zero to sixty i9by bff7 q8oa 4x4bdyp-wsor x.ij003n 8 s". Th8bxpboif0 oyasqr-4 wd73.x04ybf j 9is is a description of

  An object moving in the +x axis experiences an acceleratm4x2z;u yz0zwgwra8fz))1jpd 5 ;p/ bij*xklion of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling tofx+x-6+ si2wktv3igu the East (+x direction) begins to slow down as it approaches a traffic+xk i2s3x 6+fvig -twu light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow down as ieq*g2:w:oz (3b mxgcst im0q0t approaches a traffic light. Ma:gm:o0i bwte 3mc0xg(2*q z qske a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. M eckodw b/w/i5f32y5fake a statement concerning its accelerat/b5iwc 5e /fyk2fd w3oion.

  If the velocity of an object is zero, does it mean that the acceleratplg 3q05opp6qtij a fq)n0 h(+ion is zero? Support your answer witoq(lhn3 jpf5gq pi tap)0 q+60h an example.

  Can an object's velocity change 17t3mxeevf2 r direction when its acceleration is constant? Support your answer with an xt 31fe mev7r2example.

  Suppose that an object is moving with constant ac(p l muuv5qt 8/kd(ud1celeration. Make a statement concerning its motion with dt 1kvlu8 um5p(u/dq(respect to time.

  Can an object have increasing speed gz1:n k ka8z+m/ ngxx:while its acceleration is decreasing? Support your answer with an gkx: nk g:8z1az/ xnm+example.

  Suppose a can, after an initial kick, moves up along a smodkklo;u9e3g15 ld u uooqe.2 5oth hill of ice. Make a statement concerning i ok uq1l9d25eo ;uod5g. u3eklts acceleration.

  Under what condition is average velocity equal to the average of5jxc psiv,01bna- /4 shw a,kf the object's initial and final vasnp,hbwk,iv5 /1f-0xcj as4elocity?

  Objects A and B both start at rest. They both a y s*g 8ag)*4ryar/vqi-arsbj hog: 49ccelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed o 9ba )osihgvyr 4*raq*y/j84gs g-:a rf object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same rate. Hu (; z(8avcbncowever, object A accelerates for twice t8aun cb;(v(c zhe 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 absence of friction, whin t3kwu -8/+h5oitgxn ch of the following is true concerning its motionnx8 / -it3ku t5go+hwn?

  When an object is released from rest and falls in the 2h0z8vyfa58b cb .cm spzr5j,absence of friction, which of the following is true conceaz05b mh2 czvc .sp,8by5jr 8frning its motion?

  Suppose a ball is thrown straight up. Make a statement ayvl )a2rz/lf0 1dry3 obout the velocity and the acceleration when the ball re3r a1 vol 2/r0)fyzdylaches the highest point.

  Suppose a ball is thrown straighx13mf.ehj8d,cqm jx2 t: rb g6t up. What is its acceleration just before it reaches its hib86dmqghx e frjtj3:m1c2x. ,ghest point?

  Suppose a ball is thrown straight up, reaches a maximum height, w5zwu wr72vg4esi dev ..4ey, then falls to its initial height. Make a statement about the direction of the velocity and.7ewyse,4.e4w 2 rgwv v iu5zd acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to its init iib6 qur2:t3nial height. Make a statement abou: i3tqirn 2ub6t the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward ine *+/p4jn kaj(3apevjys:k(d the absence of air resistance. Make a statement concerning ita* s+ jy(jpp4n :k(3jvkeed/as acceleration.

  Suppose a skydiver jumps from a high-flying plax q vz qey3m-xqs+j 07xt7(bi9f 7 .g;ql:kgaane. What is her acceleration when z7ax(0-bglqjg 7qx9 qmtvaq i:7 .+;s3kyx efshe she reaches terminal velocity?

  A ball is thrown vertically upward with aom)5v9vc :hiv, 4ofl s speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maosvim)lvvf,c459 o :hximum 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 buildz hrxx:0o)zb:h8o p 7a*8lni ning. One second later, ball B is dropped from t88 bzo0xa:zp :h l )inxh7n*orhe same building. As time progresses, the distance between them

  Ball A is dropped from the top ofc my9az e:94h)0fb f,dlw jjsv h021jk a building. One second later, ball B is dropped from the same building. As time pr4j,b k0j20dhajy9hwcfl9vzef) s 1m:ogresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. Oou:f 3. 8rwfyfne is thrown up, and the other is throwuyf.8fwf3:ro n down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top mc03r0amkk +y t:o c8- ny+ewm21rgvsof a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compareym+-+tansm kr2vc00 13w o :r8e gcmky the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x ax640lu j-69qgzya utei is. The position versu tlizu9g 0j66 u-aye4qs time graph of this object is

  An object is moving with constant non-zero acceleration in0*j:th 1 j*bh5dncmo40ms( e odn4ia o the +x axis. The position versu4jhm 1c(s:joodnnh 504 *0mtia*obeds time graph of this object is

  An object is moving with constant non-zero velocity in the +x axis. The vell:odx wz *;f0kocity versus time graph ;:z fo0dwl*kxof this object is

  An object is moving with constant non-zero accel)0 o6ghcq()ao90m juhut btx9eration in the +x axis. The velocity versus time graph of this tt96couoj ))hg 0qmuxbh0a9 (object is

  The slope of a position versus time ml;a dikq 42ovdgrr).v y0*.b graph gives

  The slope of a velocity versus time grav mxxu0h*k: 3jph gives

  The area under a curve in an acceleration versus time gr.b)zu9wez g ;3ctv5hxaph gives

  The area under a curve in a velocitqozgg-i. c+v 9ndn*zge+ x:;fy versus time graph gives

  If the position versus time graph of an object5g1v+lto 7q ;tdx *riy is a horizontal line, the object is7rdt*ogv;5l q t xi1+y

  If the position versus time grap l-kbs /jpedl 6qnpl 9s5)+b(dh of an object is a vertical line, the object is6( /ddjs9 qkpellnbslb)p-5+

  If the velocity versus time graph of an object is a horizontal line, thgpq+ 3zq)r) xnlhnbn//r6t 4b5u pv5le object plnn4/b/hnt65z)r5 bxu+p3v gq l)qris

  If the velocity versus time gra*am0 85dwbv ubph of an object is a straight line making an angle of 30 degrees with the b 80uvdbw5a*mtime axis, the object is

  An object moves 15.0 m north and then 11.0 m south. 3i7bi*ho ruke8l2g7f Find both the distance traveled and the magnitude of the displ2f e7ho7bligki8 *u3 racement vector.

  A boat can move at 30 km/h in still water. How lon g*hpu64p(urn g will it take to move 12 km upstream in a river flowing 6.0 ppr6h4 *gu(n ukm/h?

  55 mi/h is how many x8 4ap :cf6o wy r1lw),vllaj4m/s? (1 mi = 1609 m)

  What must be your average speed in n iu q-mz/nqh729w2a iorder to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 41nw;ntx:uo yhours and 57 min. What is ;uno4n:1w yxt the average speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to travel 400 kwjy7ll 497b/,2gx ayumhwv1dbit;x; m?

  A ly (light year) is the distance that light travels in one year. The speed gh te1hr 8)bv)of light i r b))hetv1gh8s $3.00 \times 10^8 \; m/s$. 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 lob40.lc b* xrtt2cyvfsxnx 885ok to the side for 4.0 s,2*0 x8y5 4sb8ltxcb cn.xtfrv how far do you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100n9 * y; ev hb-oqwgvu)-0knr)f s, your average velocity i g)y o)e*fvn-9nukrq0;v- w hbs

  A polar bear starts at the North P6px0pj803 caoinxa5w ole. 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. Th 00nxoa8c563wxppij a is trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the Nowlr*vm7z4. 9 l0d, lpy qzh)oxrth Pole. It travels 1.0 km south, then 1.0 km eastzm9zlvd0,4* qwr hx) l l7po.y, 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 velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 miles. It gfy8m4ozytv6ew)y:c 6) zq y 2then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How t zqywzofev86 ymyy)c2) 6g4: far is your hometown from school?

  A motorist travels 160 km at 80 km378+,jh*cagc8fs 5lnzmkc wh /h and 160 km at 100 km/h. What is the average speed of the motorist fojhsk5,z+chn a l 8w3 *gc87fmcr this trip?

  A motorist travels for 3.0 h at 80 km/h an veeub8 n(/dz9d 2.0 h at 100 km/h. What is her average speed fo(e/ub9dezn 8 vr the trip?

  An airplane travels at 300 mi/h south for 2.00 hr d:kh9n uds(p/k 65pc and then at 250 mi/h north for 750 mile hk sp/pdnkur:c(6 95ds. What is the average speed for the trip?

  In a 400-m relay race the anchormanbq 8g ymph+m a.fu1(+u (the person 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 teahfg+ up8 u.a1q+bmm(y m 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 14 s. The car's averiiya*5rw)*x4yrn,4b dyn 0d j age velocity during deceleration was 62 km/h. What was the car's decelen*) *y, xy445bwdnyrjii 0dra ration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average rate ofwhensk6krr0ffyq5 6l v02 o43 r w0 f qehlk26k45n 6yfs0vr3o$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate o dpy1wx8nz) li6,ull6o2ok 5sf $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest my v,lkp0-:ii-k922bbqeukl and 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 a constant accelerpce9tr.q0c/oul /jei x v 5kev ::c,n6ation /v/ x:,cink pcue .o6v5jqr e9t:0lec 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 7.2 m/s experiences a constant amhv9kwgu(l m7 7n;2hfcceleration of7mku9mh7l w f hn(;2gv $3.8 \; m/s^2$. What is the cart's displacement during the first 7.3 s of its motion?

  A bullet moving horizontally to the right (+x direction htlgdvb3+*z r3t9q.v) with a speed of 271 m/s strikes a sandbag and penetrates vz*3qrtd+v b9tl.3 gh a distance of 31.05 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launche. jf(go2wrvvltf6ohrf 5 65 r;d 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 accelrjort.whg6fo 5(; ff65l2vv reration is constant, what is the length of the catapult?

  A car starting from rest moves with 3njx y3c cs/cf:4r*, ynxlv d-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. What is its 3ds y98 knmwuso3 87uyaverage accele9suwyoy mus8n 8d7k33 ration?

  An object starts from rest and undergoes uni1g;(ni4 0nb t h2ygcyxj*mn1bform acceleration. During the first second it travels 4.8 m. How4(1 m 1ng;xcnbbi2*ntgyhj y0 far will it travel during the third second?

  An object is moving in a straight line with constant acs9)i0;zvrzp ncdi4p/ celeration. Initially it is traveling at 16 m/s. Thszc v9pn/dp ir0;z)i4ree seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and ac(e;nz-4hx pe.;a zb kncelerates 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 yn6x( ; bd fta;bu;sm 4jkly)/f7l bd-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 car that has been waiting f1cmat),3offx p 61w.9 g zcjyat the intersection starts a)op63 .mjzxcw,9fyff11 ctaghead 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 speedrp 8fcq/9 axew.,,qyvpa(hz7 of 12 m/s on the surface of planet X where the acceleration due to ghezpp8c ,r afx7w.q /(,9yvaqravity 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 lml mo7b,t+x)vef7,z m/s on the surface of planet X where the accf)+lze,7otl mmxb, v7eleration 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 2b--c/ l ygsy l7rcu7yon the surface of planet X where the acceleration due ty-cc ul yb/7 -lrgy72so 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 o)fj t7*sb ova2f planet X where the acceleration due to grf) o*ajt sv72bavity 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 holds / f7 u,/wzijwwa ruler between your fingers and releases it without warning, how far can you expect the ruler ti wwzwf/7u/ j,o fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocitu3 *m dalz*opuy: 2k+sy after 3.0a:s32 d+m yk upo*zlu*0 s?

  A bullet shot straight up returns to its stac -n1rr7*y bde5sn+jd rting point in 14 s. What is the initial speed of thecr-s5b y *ndej1dr7 +n bullet?

  A ball is thrown straight upt.q*nyiaq ,siq ; )f2y2vo ;ea with a speed of 36.0 m/s. How long does it take to return to its s, ;oa2y t in;sve*fqyq iq2).atarting point?

  A ball is thrown downward from the top of a bulm-;k/ cei hy5x8jg* uilding with an initial speed of 5 m/s. It strikes the ground after 3.2 s. How high is the build* m 8/xhgy lu;c5iej-king?

  A ball is thrown straight up with a speed of 30 m/s. (9e kn 6x9c1ca9z3qqts only fill in numerical value ec1k9 nt qcqa96z s3x9in 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 sp ( c-b2hi.jg5ot9 woqueed of 23.6 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 3 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 velocity at t = 1.zk)d ou2q -g xfg*nn180 s?

  In Fig. below, what is the ve5 tk xg g 6vse:(faxyk+)0uwd8locity at t = 2.5 s?

  In Fig. below, what is the velocity atorfau27 c55ami.m; hn/z ts ,t t = 4.0 s?

  In Fig. below, what is the velocity--i)zyy fh5qqjm-))gw oc-v l at t = 5.5 s?

  In Fig. below, what is t83j x4cwi 6qsghe average velocity from 0 to 4.0 s?

  In Fig. below, what is the rn-l93zlpqs,x ;7uvnr oz vb0,z8s-x average velocity from 0 to 6.0 s?

  In Fig. below, what 0 mdag1d+j2iqis the acceleration at 1.0 s?

  In Fig. below, what is the acceleration at 3.0(dlw hwvy+6b6 1jlm, p s?

  In Fig. below, what isu5c-2 )nqtye r the average acceleration from 0 to 5.0 s?

  In Fig. below, what is tb3ucb(m8r gtbdi:; t .he average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement -pqnssq -q7 9vfrom 0 to 8.0 s?

Does a car speedometer measure speed, vexcm( rygqs5-, g ki0g-6xg0;oeqrxg 0locity? {speed|velocity}

  An object can have a varying speed ifkqe yc 3/c5/cq its velocity is constant.

  The velocity of an object can be negative when its acceleration is po7t956e acwa adsitive.

  If one object has a greater speed than a second object, the first must have 98j rp/ lesd zr.4tz 0s9(slnga greater accele8zl/ l4j. stgp9( e9szrdrsn0ration.

  Two cars emerge side by side from a tunnel. Car A is traveling gf :,t-hyqfj,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 increasinc5e n,7 mcgv0qg in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves thj 8jj.frx t)w9+q4feovl2 q2ce bat witwq22rfj 4e jv.ox)lfj89 tc+ qh 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 object speeds up, what is h9-wq+z*gihzb appening to its acceleration, how does z-i*hg9 w z+bqit change if air friction is ignored?

  As a freely falling object spee)f8f-ypx + cfg. oczt8ds up, what is happening to its acceleration, how does it change if air friction CAN NOT be ignoredfy8ctop -+f8 cx).gfz?

  An object that is thrown vertically upward will return to7q v+3m ze7ji4l1kpm(a wwhnp s924ue g9tma1 its original position with the same speed as it had initially if air resistance is negligible. If aiu 1 727mzsn9k(vwe ihmmawj9pq4pgl4ea3 t1 +r resistance is appreciable, how will this result be altered?

  An object can have zero velocity and unygwwj *jj3+. 2k)r enonzero acceleration at the same time.

  An object can have nonzetr0j,t5pv -nsb y8lc5 ro velocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making nmfnn b9kj.2 7ufk7*yl o stops along the way has zero acceleration al2k9*nl7umk y f. j7fbnl the time.

  A rolling ball moves from klxm 01l 8wpz5$x_1=2.5 \mathrm{~cm}$ to $x_2=-5.8 \mathrm{~cm}$ during the time from $t_1=2.4 \mathrm{~s}$ to $t_2=5.4 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.3 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=8.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-milpa.j8xc e-m cxji9o87m*uis 9e ($1 \; mile = 1609 \; m$) track in a total time of 7.7 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainep-)0byfh8el/dqq-by 3f j gzb/gjf, 5r in a straight line, moving 106 m away in 13.2 s. It then turns abruptly and gallops halfway b-b-bj) 8blg hgq3 /pd50 qzf,efy jf/yack in 4.7 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 frodx ezwn10*5q vsl4;5;x okkddm $10 \; m/s$ to $22 \; m/s$ 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 hge pnln4k zg8qk 5g )zi:(i5:$18 \; m/s$ to rest in a distance of 60 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speefu1 ,b2ij txo*dz0qf( d of $26 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $3.0 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially top s/so7at1+d8 qw0ak sy qoau9f ,peed about o0qqoat7+ d1 8kyswu9asf,/a$11.2 \; m/s$ in the first 12.8 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 a s 4dhwaro 9,:tnow-03du) fp7fz n1urd gw-e2jpeed of $16 \; m/s$ to rest in 5.62 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a-6 4+t tbz .j1gaekygk car leaves skid marks 92 m long on the highway. Assuming a k +-.agb1y46jtt gzek deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck8(ca 74h tah ,* jvihn3)zn3j,q piggz 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 run innig+(1s-i3;sa j ey /pq7qc;/ vuutnd less than 30.0 min. After exactly 27.0 min, there are stil71/u n+vssnq(yit;c aud pq; / e-g3jil 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?    $s$