Suppose that an object travels from one point in space t* tqufg7jdy;1x)a07g;(8hx v myispbo another. Make a comparison between the displpgmxqia xg t;77(fys ju8b)*v1hdy;0 acement and the distance traveled.

  When is the average velocity of an objectm5 jr0y(t0 nn rk/lu8i equal to the instantaneous velocity?

  A new car manufacturer advertises that their w ,rmy g-rj88-w0j(gfxwvn )gjaq:39 3zy bq tcar can go "from zero to sixty in 8 s". This is a descr3 rgz9n8mr wyj8 ) j :g0q wjtyw-q,g3(x-vabfiption of

  An object moving in the +x axis experiences an wtei; e; 5+7 xugbkb:vacceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East stv,s sa) 3e+ruy d()u(+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleratirs)ad3v) (uyts s +e,uon.

  Suppose that a car traveling to the West (-x direction0jr: k ap2y5a36 jo6s9zskiyj) begins to slow down as itja6k3 sa6j5y9 izsrok yj :2p0 approaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statemen5,ku shq3aq0r t concerning its accelerqq,a3 skuh5 0ration.

  If the velocity of an object is zerwf )itx7h -+zlo, does it mean that the acceleration is zero? Support your answer with an ex)t7whi xfzl +-ample.

  Can an object's velocity change direction when its a9syk, b4aokv*tva/+ z1yx* xt cceleration is constant? Support your answer with an examp4 byxto +9**k/azks1 avxvy t,le.

  Suppose that an object is movinm8tr5uz)bm0b 9e+w:moru qv2g with constant acceleration. Make a statement concerning its motion with respect 0mewtq9 rmu85:obm z2 b+v)ur to time.

  Can an object have increasing speed while its accelslbck.cn.t gzq8 )50g eration is decreasing? Support your answer with an example.s . n)tgzb8k.c5gcql 0

  Suppose a can, after an initial kick, moves up alw-rn 64*ocis cong a smooth hill of ice. Make a statement concerning its acs6 *i nc4cwo-rceleration.

  Under what condition is average velocity2wp gk,o5b7 o. cn:hfo equal to the average of the object's initial and final velocib.hw,7kpno: 5go f2o cty?

  Objects A and B both start at rest. They both accelerate at the same rate. Howf zefacyh; c()d m/0y+ever, object A accelerates for (ac c;0/zhe)y+d fyfm 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 v 6y8i el) s5rsr-bm4jstart from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as o8vb seyjrmrs-54l6i ) bject B. What is the distance traveled by object A compared to that of object B?

  When an object is rewsrohg-e 8v*wz)kn38 v3/eqd leased from rest and falls in the absence of friction, which of theh )wwne/qv8g-r3dos 3*vz8 ke following is true concerning its motion?

  When an object is released from rest and falls in the absence of friction, whin(b/ xl-l1ht (9fszr nch of the ft rnfnbhlsx-1((l9z /ollowing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the veloci v us0 i3s7/bc)7zjcyoty and the acceleration when the ball reaches the highes7)oc0uybi/jzv 3 cs7st point.

  Suppose a ball is thrown 2acff5a *ly m nb;dm25straight up. What is its acceleration just before it rd2nflaa5 fmmy b2* 5;ceaches its highest point?

  Suppose a ball is thrown straight up, reaches a maximumpf0 z/( t2-vosbl8y yg height, then falls to its initial height. Make a statement about t0oblvt(py8-z/ yfgs 2he direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximu6(k-tr;rc6v)mv,g dgb ff,i hm height, then falls to its initial height. Makf ,cv mbd;r)(rit6h-v6kg,g fe a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence o7bbl 6k+ 5ilp 4z2 +.ip rijum4gvu.nff air resistance. Make a statemen5 k +u4b l prl7i+z .fpj.u62ngivmb4it concerning its acceleration.

  Suppose a skydiver jumps fsbzw3 *nfd : o9oyf.+wrom a high-flying plane. What is her acceleration when she she *wzs. fd3n +:ow9byforeaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical second ba.oaury v44 /au5hcyr/ ll is uu/. 4ryv5c/o 4ryaahthrown 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 ball?)

  Ball A is dropped from the top of a building. One second later, ball B is s )6vqi *k.hhidropped from the same building. As time progresses, the distance bet) viqk sihh.*6ween them

  Ball A is dropped from the top of a building.)(9rxonskt8f 7emzlf/p vv1+ (x kn0x One second later, ball B is dropped from the same building. As +x8 nprof9k(0v f/lxv7xz e1 tmnsk)(time progresses, the difference in their speeds

  Two objects are thrown from the top of a*v 4 l6khivcm8 tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What k h8 lm*i4vc6vare their speeds when they hit the street?

  A brick is dropped from the top of a building. A seco9ycex rdh-d4vbpn ;wq+5mf;;w- nm 8ind brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance.vi-+w;dh5enn; d8- mxw4bqpf;9cy mr Compare the accelerations of the two bricks.

  An object is moving with con xz;.t(vot- tzstant non-zero velocity in the +x axis. The position versus time grap; tx.to-vtz(zh of this object is

  An object is moving with constant non-zero accelez90-q-o uu 74kgb wsmk ye7dbtg0/vp)ration in the +x axis. The position versus time graph of this objeuy - oekg0u4 pwq/ v)szbbt7m70dk -9gct is

  An object is moving with constant non-zero velocity in the +x axis. The ve3 htc7uz*7me klocity versus time graph of this object i7 uz 3kme*tch7s

  An object is moving with constant non-zera 6fa7edw:-gro acceleration in the +x axis. The velocity versus time graph of this objwgrf 7a:ade-6 ect is

  The slope of a position versus tralniac *qo 9nse2s ktm 4*:*,ime graph gives

  The slope of a velocity vfe/ *tea12 tlzersus time graph gives

  The area under a curve ino ggrl0dp7r4q n bm8 z,id;3l*j)8agy an acceleration versus time graph gives

  The area under a curve in a velocity versus time gyaivx cl q5eg6(:hj/h2+(zug t adi ,5raph gives

  If the position versus p;:epft.evcgh+ 9 6.it k-djp time graph of an object is a horizontal line, the object i pct g.j e;e9:6dvi+pp k.-tfhs

  If the position versus time graph of an object is a v) -yxlkn :(rlwertical line, the object is x)-nlyr(wl: k

  If the velocity versus time graph of an object is a horizontav b ss+qei; ,phnm0(j)l line, the object s+;p0j ib) meqhns ,(vis

  If the velocity versus time graph of an object is a straight line makin7ok:l+ dg 0v td 0u6yoltk0k.rg an angle of 30 degrees with the00ol 0.ou76kk rt:+ltydgd vk time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance trt- q9 jo:xkf :s0 lopuolepi 56;11vsvaveled and the magnitude of t1vq-06j9ptv:oslk; 1xs : lpiefo ou5he displacement vector.

  A boat can move at 30 km/h in still water. How long will it tacy tj4 nl5h nb.b0:)hcke to move 12 km upstream in a river flowing 6l0jb5hncny :bc4).ht .0 km/h?

  55 mi/h is how many m/s? (1 mi =9wnq9t upsmkw 5/- 2jb 1609 m)

  What must be your average m, .x fg)clws,n;xuc(speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours anrzn tko0e+k7v4*aiw: uwzdk4qq;)-n d 57 min. What i d44kk;w0)u: *newrt 7z zko-vqq+ ains 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 kmr4hj dzn 6e3+ (p-qvse?

  A ly (light year) is the distcw99nf5(uzia s)m u i*ance that light travels in one year. The speed of ligh z*(c)f99iaunuw5mis t 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 a strain q3kjh w6vgszo7+r0+ ght road and you look to the side for 4.0 s, how far dj hoz+q7nvk+ 6swr 30go you travel during this inattentive period?

  If you run a complete loop around an outd 5*: enkpr4nd2a( blfgoor track (400 m), in 100 s, your average velorp2k b*5l:4 f(ne ndagcity is

  A polar bear starts at the North Pole. It travels 1.0 km south,02rw +mf0)k*0jz g qg(fq0c/jh bw7kbxq.ff e then 1.0 km east, the rw0(j) /hgm2kqj0 7q+q*b x fef 0kg0wfzcbf.n 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 speed?

  A polar bear starts at the.wq(sp:u2 fa.3 3 seh3ejj joe9i x-*uoc,xka North Pole. 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 trip takes 45 mi-u 933waeo(3u,a . xfi j.sek*2ejqso xh:jpcn. What was the bear's average velocity?

  You are driving home on a 0g q-kih,dzn; weekend 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 fag-0 ;nihdqz, kr is your hometown from school?

  A motorist travels 1f cg2 gj.u6xh. j0cjs4qj,1nf60 km at 80 km/h and 160 km at 100 km/h. What is the average spee 41h uq jjf6g xc.sfjj,c2n.0gd 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. 8dlbs :. qk7kvbv*pg/What is her averbkpbv vg.l:7d8ks* /qage speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 nb6i),83nmxg a so yn*h and then at 250 mi/h north for 750 miles. What is the * g x68,a)bnm3soyninaverage speed for the trip?

  In a 400-m relay race the anchorml*wqwgs/4/3 u vir:kz an (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 team A runner starts the final leg 4 3w/r*/ :kwzvgqusi lof the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and ioivyjzn *(+ f5gl6k9 comes to a stop after 8 s. The car's average velocity during decelerationkgo 5z69i j(v*li+n yf was 76 km/h. What was the car's deceleration while slowing down?

  An airplane increases 4 muxk.)xox,y its speed from 100 m/s to 160 m/s, at the average rate of yo4 x). xkux,m$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at thzb*, rzg zhis4ly -p//e 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 a s*4j43xxa m- jfcqd*tccelerates 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/s3m29 oh,j xdvqb 0x9vu for 10 s. It then speeds up with a constant acceleration 0vjm,o 29 x qv3u9xhdbof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 4.1 m/s experiences a constant acceleraa, :y pew j /cy9o+zo;d+pwnp.tion of +.zp y,pwey;nj/wo a:9+cpdo $3.4 \; m/s^2$. What is the cart's displacement during the first 8.2 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 363 m/g(, 5 3n 3howqozcl1ho rja* ykp9/e8ds strikes a sandbag and penetrates a distance of 82.13 cm. What ihp(/a3d*okqz1l8wey5 oc hn, grjo9 3s the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on anvmz,vv /w /sf+ aircraft carrier. It reaches a speed of 42 m/s at the+vz /, /mwsvvf 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 constant a*b s9at 11bfgncceleration 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 j:v4i1*+gys j slulk5:)wpbcm/s in a distance of 200 m. What is its average accelera1yij* l+ ks4 w5bl:)vpuc :gjstion?

  An object starts from reacr j3:osv4m* j6g0ul st and undergoes uniform acceleration. During the first second it travels 2.1 m. How far will it tg us4ra:c3m0j j*6olvravel during the third second?

  An object is moving in a straight line with constant acceji;2ak z,-/ xx,pywifjk p4:0gmz1xi leration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move d;xj:,-zyk0 p/pjg z4xxf 2,mk 1iwiaiuring this time?

  A car starts from rest and accelerates slaez+0 fsy14 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 dece j*wza80abp cj :g,t;elerate 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 car tuw/8q3 n1 binxlyjd 95 ucb1;hhat has been waiting at the intersectl1c;d / n bb5913h n8yxuijuqwion starts 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 1sw gn(9ipvy. *1e2bt a2 m/s on the surface of planet X where the acceleratn1s(*e 2b.pw 9tyviga ion 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 th:+ beihg(;vnqy*-gz jyiem *3e surface of planet X where the acceleration due t-q gghe* +yiivemy *;:n(3b zjo 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 n4j. 4,wyb- yetk( socwith a speed of 15 m/s on the surface of planet X where the acceleration due wk ojt4(syy nb.4ce ,-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 wit2e*nynrk 49tib 1- nquh a speed of 14 m/s on the surface of planet X where the acceleration 4nrqyn* tne-9u 2ib1kdue 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. t5a)5 uvqprx z p1g vsq6u0w..If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the rua w5r.)g5.qu1p qpu x0ztvsv6ler to fall before you catch it?

  A ball is thrown upward at a ve hgph0ddvh9 5-/ kpom-locity of 19.6 m/s. What is its velocity after 3.0-vk9h- phghd m/50dop0 s?

  A bullet shot straig- /ha4 vmm(tgpht up returns to its starting point in 16 s. What is the initial-/mvmp( gh 4ta speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How por 28o, y7 onhaogts7* :dz;k,ln d(tlong does it take to re ty(a ponr ogn:87z2k;*o,7 o, dldhstturn to its starting point?

  A ball is thrown downward from the ton(z ov,)0l*)aj 1 db dscwp1ymp of a building with an initial speed of 19 m/s. *,advjbzdop)(c w)y s1lmn0 1 It strikes the ground after 5.2 s. How high is the building?

  A ball is thrown straight up with a sp5t.szi 4 e.5ciyigcx ;eed of 30 m/s. (only fill in numerical value in .zi5igscy4e5c.i; tx 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 31.p6 )auq1:dy efyn5 jy(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 8 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 8.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is tvqm:j fep8z+8cp) me/ he velocity at t = 1.0 s?

  In Fig. below, what -2e co 8t,dqezxo /2ehis the velocity at t = 2.5 s?

  In Fig. below, what is thehrj(i fk*da)5 velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = mqlpe8vll *3,5.5 s?

  In Fig. below, what is the average velocity from 0 to 4.0 pg0+c 9pu s)vbym8nl1ayok7- s?

  In Fig. below, what is tsaal55bx 9f)ts8xa 0 whe average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 s?u82mtl+6egq71nqijk gw h;i*

  In Fig. below, what is the accelerxo (.nd*mg) dtation at 3.0 s?

  In Fig. below, what is the average acceleration from 0 to 5.0 b;s kpu) x2 ltn*s1 tn;ago 72w3h(deus?

  In Fig. below, what is the average accelig1wojvjd k-oko.k44h6 c)9eeration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8. snirv8*ax r970 s?

Does a car speedometer measure spv3x cn*kz;w q ))dsa.peed, velocity? {speed|velocity}

  An object can have a varying speed il+n*z ckpwywp78hz ,umm8,5 mf its velocity is constant.

  The velocity of an object t+pi dpx*2ir0bm1 b6a can be negative when its acceleration is positive.

  If one object has a greater speed than9.2sic1xxpiit* ioh ( n 7nv1s a second object, the first must have a greater accel2ss p7. i*cix9( xi1ntvno1hi eration.

  Two cars emerge side by side from a tunnel. Car A is traveling wv vo10+lw/p qoyz e(+aith 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 increxct/p ;l1yuqmf ga:z8b 2*8veasing in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the b)c:no n5v ut*air. It leaves the bat with a speed on c:ubnv t*o5)f $120 \; km/h$. 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 accelera pl9vj1b,q2se rf q7u,1uxa*etion, how does it change if air friction isbf9q lvprx*,1 ,qea se1u uj27 ignored?

  As a freely falling object speeds up, wha;)(v nffy4i7piu.v wat is happening to its acceleration, how does it change if air v7.fi ) inwv ;(aypfu4friction CAN NOT be ignored?

  An object that is thrown vertically upward will /kf3o(b /8qdc4 tucga return to its original position with the same speed3dbuka/toqg/c4 c8f( as 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 accelemf7 6 31k67o ;e5orxs7md xgjre2xaqvration at the same time.

  An object can have nonzero velocity and :ov2ze;)-4salw izl ozero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor making no stopsv2byw2 xt71 v4n *r snllnz11bvz-) lg along the way has zero accele21 vx)*l z1zt v7nw 2vyr bs4-nlgl1nbration all the time.

  A rolling ball moves ex)in 5 sj5uojuz j29+9y)qvw from $x_1=2.3 \mathrm{~cm}$ to $x_2=-4.7 \mathrm{~cm}$ during the time from $t_1=2.7 \mathrm{~s}$ 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 $t_1=-3.0 \mathrm{~s}$ is at $x_1=2.2 \mathrm{~cm}$ and at $t_2=3.2 \mathrm{~s}$ is at $x_2=8.1 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarteqfki.7kf (4ieq svqm7s/2:0 n aao8her-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.6 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 106 m away in nz(yz* sn ra/.10.7 s. It then turns abruptly and gallops halfwas.n az* (zy/nry back 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 from crjqo 39rg ;m0$13 \; m/s$ to $24 \; m/s$ in 5.0 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 wz.. ta 1kul.( e3txn-byaz k9$21 \; m/s$ to rest in a distance of 74 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a s) h vzsnf/ ha:y/g 0 ,/xx(qbba-lhj+opeed of $33 \; m/s$ 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 jyqu o8qx.+ ngdz+*e h bi3x3, g84tyscan burst out of the blocks to essentially top speed about 8xqx++8 3ggni y h e.y 4z3d*tousj,qb$10.8 \; m/s$ in the first 12.7 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 fr tgt1:h /0z e;te-od8tjtqt6 som a speed of $19 \; m/s$ to rest in 5.61 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves sk ;4cvth tsae pd) 22dmth)62tfid marks 92 m long on the highway. Assuming a deceleratt s 2;tc)tma)2pvfh d4deh6 2tion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tru,(i2pa/:iljlyy 1tsh ck 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 the18n/s /s 1(6nize opxinjpc: h 10,000-m run in less than 30.0 min. After exactly 27.0 ms jen hi8/spo6(zn nc p1x:1/iin, there 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?    $s$