Suppose that an object travels from one point in spa w9f++ewsxap :lsa /.ece to another. Make a comparison between the displacement and the distance tra.e+ea/ psww+:fls a x9veled.

  When is the average velocity of an object equal to the instantaneous velocbix .ymp2hkp5-cp6j*ity?

  A new car manufacturer advertises that their car can go "from zero to sixty in xmu5am h4 )fb08 s". This is a description)0fm m4hb 5xua of

  An object moving in the +x axis expe;xq ym:y.f8d kriences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car tr-nbk: 1*toxvj aveling to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its*:1vo knbj-xt acceleration.

  Suppose that a car traveling to td;x935tt e 1 m9wir:jzjg9 uythe West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning itsi:zt1 3 jw;e9grxt9j5mdty9u acceleration.

  Suppose that an object is moving with a constant velocity. Makeotgtmcx).y4m- if)h/w5t ,s9x s: vam a statement concerning its acceleration.- /:ymi 5x t 4tvtmmawh fx9s,co)g.)s

  If the velocity of an object is z: a 4af* *1wxgk(deajmero, does it mean that the acceleration is zero? Support your ansa(aea4*kg*dfxj1 w: m wer with an example.

  Can an object's velocity change direction when its acceleration is constant? Su(f0s:9)bndf2c6l 1jd q(y k f yqzuan.p d.ny yl:fz(91cqa20jbfn6s )kfd qu(port your answer with an example.

  Suppose that an object is mo vkk.; kgpcu-qq 5/p(uh:(o ynving with constant acceleration. Make a statement concerning its motion with resc (:p(nk/qkk.q;5hvou-p ygu pect to time.

  Can an object have increasing speed while its k62lnw i 7 ucjchp5b9hn- 2.lqacceleration is decreasing? Support your answer wj-bh2 wl .c7 ih6ncnk5qlu92 pith an example.

  Suppose a can, after an initial kick, moveja 1n70 bekfw/s up along a smooth hill of ice. Make a statement concerning its accelen0f 7j/aek1bwration.

  Under what condition is average velocity equal to the aul *(a5qa,o pv 1vyli );cxv0iverage of the object's initial and finalv5a,puql( x*via v )o;0il yc1 velocity?

  Objects A and B both start at rest. Theyedb jw. aw++k)1ikty7hz 8bq.e+ e 0nl both accelerate at the same rate. However, object A accelerates for twice the time as objjnk0+d87 elw1iq +ae hw.yb)bkz e.+ tect B. What is the final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both accelerate at the same r8* 8o(n:xbuvlqwuml6 ate. However, object A accelerates ou vnq u8*lbm8:x (lw6for 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 1h0,68 qzybl4yk)rt-stfv w i rest and falls in the absence of friction, which of the follsq04tr ky81f-6byzh t,lwi )vowing is true concerning its motion?

  When an object is released from rest and falls in the absence of fricti ys9juu8p7s:d1 6tcxxon, which of the following is true concerning its moti9u17udxxsyc86sj p:t on?

  Suppose a ball is thrown straight up. Make a statement about the velocity anyp6w 26q;uw yc)sv5qud the acceleration when the ball rea qq up26yuyww s)56cv;ches the highest point.

  Suppose a ball is thrown straight ihd90l6ous,rk3kt5 cup. What is its acceleration just before it reachs,c d6r 35k9uilth 0okes its highest point?

  Suppose a ball is thrown straight 3:igu2wd6d je/t aza-up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the bai:a3jdz2/-g ut w 6adell is going up.

  A ball is thrown straight up, reaches a maximum u* 4mn ,k5jw10zaxczf height, then falls to its initial height. Make a statement about the direction of the velocitu mzzf0wx1c5,j*an4 ky and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the ab.9jn i1:pxac l1.j qqk q-d2xusence of air resistance. Make a statement concerning its acceleration qj-qc9 idlxpk.q 11njax2:u..

  Suppose a skydiver jumps from a high-flying plane. What is her accelxhn-)at2 4vv 4fvuk9zeration when she she reaches term4z)-fvtuhv vxk na 942inal velocity?

  A ball is thrown vertically upward with a speed v. An identical secondxj x*md/s t,q59nn msi 2j32c9kwyyl + ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the secm*92xy3,ymnxs wqj ln+k2csj/t i 9d 5ond 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.(;(ibccul zykq pr6(z.+xmn later, ball B is dropped from the same bui. 6 cq(z;+.kn xri (pyb(lumzclding. As time progresses, the distance between them

  Ball A is dropped from the top of a buildinyzi- 8.nn 4oyt7 b8pbvg. One second later, ball B is dropped from the same building. As time progresses, the difference in p8ntv .z8-nbyb y47 iotheir speeds

  Two objects are thrown from the top of a tall b5u t ag2n,8zhmuilding. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the strnuz5tmh 2 8ga,eet?

  A brick is dropped from the top of a building. A second briz9j21pctsxa8-*cq vv ck is thrown straight down from t-8pcv jvta21qsz x*c 9he same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The positionj )t8 5o:tttdb versus time grapt)o 8t5bdt j:th of this object is

  An object is moving with constant nt q/hndh2ubn-y m 59/t0cbf.qon-zero acceleration in the +x axis. The position versus time graph o0c /.dhnhbnm -t tq9y5q/fb2u f this object is

  An object is moving with constant non-zero velocuta ai2 as 9zghe.35g-1o 0hccity in the +x axis. The velocity versus time graph of this object et o0azc91ga 5-h3 isu2hc .gais

  An object is moving with constant non-zero acceleration in the +x axis. The velxf.ydz 96syi)ocity versus time graph of thisd9ys6yx.i fz ) object is

  The slope of a positijri35lxr f+np y0y:j/pj5di8on versus time graph gives

  The slope of a velocity versus timedz: tj : y e8m v-h8q2ynki-n89z;bpjfp3:qvm graph gives

  The area under a curve in an acceleration versus time graph go (q 2(;brizaeives

  The area under a curve in a velocity versus time graph g7 fz ef8o 70/tmasc8xzives

  If the position versus time graph ofqzt+k:lzl/lu1y) cl5ic: 8oo an object is a horizontal line, the object i5+8l /:tlq)zkol lczyoi :c1u s

  If the position versus time graph of an object is a vertical line, thek6*91wy npbuz object isnwy *u91zbk 6p

  If the velocity versus time graph of an object is a horizoa xo+olt)x4f(iv ji66 ntal line, the object isivx6j) +46ti x lfa(oo

  If the velocity versus time graph of an object is a straigh6q)yev 2pef-hzr-gdvab u.6 8t line making an angle of 3q-by.z avvg f8r deu2-ep)h660 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m sout410 r3ij5thwt kp(td 3j yud:kh. Find both the distance traveled and the magnitude of the displacemenhrtw d( tk31d pji:yt5juk3 40t vector.

  A boat can move at 30 km/h in still water. Hax (b; tr.nt-1x b4rno5 sycwm5hxi/.ow long will it take to move 12 km upstream in a rib n/ynmxit1 x ;wr5x(c5t rahs o-b4..ver flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1k412 e3x3 vf9zvf kt69,p hv,y0ocwktoj r/a n609 m)

  What must be your average speed in order to travel 350 km r1voqu1ij;.fg+ rk j3 in 5.15 h?

  A runner ran the marathon (approximately 42.(ohk2*dpt- 8ce yi4e,f9vk jk 0 km) in 2 hours and 57 min. What is the average28p - tv ck*9i(jfkk4eo y,edh speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it (+h3i(iji l axhyn/vkbp-n.)to travel 400 km?

  A ly (light year) is w9aw3kbt6d;y,f-0uu ng -jththe distance that light travels in one year. The speed of h-d ut-nk yt;6g3wj fuw ,a9b0light 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 straight road and you look to the side a ,4l o1wdxy+ky;q:cu,u/pcb . dwx-nfor 4.0 s, how far do you travel during/-q kc:w xd,dplwa1;cxu4y+ ,n o.yub this inattentive period?

  If you run a complete loop around an outdoor track (4 kzpjqugdq:kc8 2*u5s z7a2z *00 m), in 100 s, your average velocza k5gupqk2d jq28s:z**c7 zuity is

  A polar bear starts at the North Pole. It travevlu8 d2ui si-0ls 1.0 km south, then 1.0 km east, then 1.0 ki u8s2-vu lid0m 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 North Pole. Itqa.x- vuvm y,*7xyg c(dz ).ki 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 min. What (ym yk*)u.-.qixx7 vdgav, czwas the bear's average velocity?

  You are driving home on a weekend*.4al qav5 )t7a ucesz from school at 55 mi/h for 110 miles. It then starts to snow and you .z qva *u)seat 5cl47aslow 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 c+kz-3pwv rwr*0zn(n at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this trin+-z(0zrn r*kvwp3cwp?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h2q+b c mtnmi6-. What is her average speed bm6imtq2+cn - for the trip?

  An airplane travels at 300 mi/h a6 7pbd avk- ; zpiovt8/c7g9usouth for 2.00 h and then at 250 mi/h north for 750 miles. Wp9ag ;7b/- otd 6uik7av8zv cphat is the average speed for the trip?

  In a 400-m relay race the anchorman (the person ;2le9xyr0lp zz w2wu* who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, czw2 p;9xwleu r*zyl0 2an 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 com6q .md4nqnvm;p) k+h ves to a stop after 13 s. The car's average velocity during mqqmkn+vh)p.n d v64 ;deceleration was 67 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s y7p o2tfu 1f dx*/fjw:to 160 m/s, at the average rate of j*y1:f27fowp d f/tux$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accele c; .3xsrtkc z3l3ks+b*xhd3mrates 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 accelerates 5rwjpx 5pa+* rat $4.0 \; m/s^2$ 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 constantm6vcz fo/ f 20/(.;d d4fuaqhk 8keput acceleration ozmp v .hfc4kefo;6tf /82ud(/0k da uqf $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initia g-lkmex 8c31vl velocity of 6.7 m/s experiences a constant acceleration of cm8gx1-k l3ve$1.3 \; m/s^2$. What is the cart's displacement during the first 4.7 s of its motion?

  A bullet moving horizontallyi, gio mw5;w,eccrwsaa)1+;q to the right (+x direction) with a speed of 220 m/s strikes a sandbag;co,w qsm;wici)+e 5g,a 1arw and penetrates a distance of 67.49 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult onh -:c3h:+vqnjfwqml1 -x p.yv an aircraft carrier. It reaches a speed of 42 m/s at the jyn1 fqxhpv.lm::3c+h -q -vwend 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 movcxaoem2j7 3* j l10zssz.s1 thes 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. What is its avpik75w12 ut0m ,ono x5pluzv 759bmj perage acxpjwl 7omp9znitu1bu 5 omk07,25 p5v celeration?

  An object starts from rest and undergoes uniform acceleration. Duringiae(u7jo fi(o;)c *h u the first second it travels 9.8 m. How far will it travefj;oo u(i7ei*(h) a cul during the third second?

  An object is moving in a straight line with constant acceleration k7*i9pidl,4ba;bsux)jy1 xh 69eyq v. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move durinv *hb x9 1d9l4eyupskb i),a6 yxiq;7jg this time?

  A car starts from rest and accelerates uke6g6 +1clczt niformly 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 decj-ki- jt job(;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 that has been waiting at qw17fgs-ec x6 a zx*h-gt nd8*the intersection n qx 7*gf-81eg xsdc6 ahwzt*-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 12 (kgk,g,jaq7 bm/s on the surface of planet X where bg(a,,7k gjkqthe acceleration 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 o-2yc-n uryz;(ncegb ;f 12 m/s on the surface of planet X where the acceleration due to gravity is( yz-;-c ;eynrcu2gbn $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

  An object is thrown upward with a speed coem8.v n3h0agwz03g+aw ,e w of 15 m/s on the surface of planet X where g+necoeg, 0w v.3a803 hzawwm the acceleration due 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 speed of 14 m/s on vyqyaor4,vova8 i9pda ;4 +)rthe surface of planet X where the accelera+) av49vo a8i4;r avd ryoqpy,tion due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is uan n2h6. 5xirela1c8 sc3-dmo sually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you excd-n2sc8 r1.an eo5x a6 3lhmipect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What i mh kmy3+ gwz0*e:stt5s its velocity after 3.00 s?0+m my he:5t* ztgs3wk

  A bullet shot straight up returns to its starting point in 5 s. What isak0/c c00owo : potx-:yi7cux the initial speed owok 7:c -ptx0 :ixacu0c0ooy/f the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. .os36b w v,g(qd.r erj;e3m2 soqf*rzHow long does it take to return to its starti z jo63ds gsew3fv(* mqr .oeq2,;r.rbng point?

  A ball is thrown downwarn vpbe3(i 6:o2m.f gpad from the top of a building with an initial speed of 12 m/s. It strikes the ground after 5.4 s. How higm2v:( 63fg. beaop pnih is the building?

  A ball is thrown straight up with a speed o*sh.vuef3 .d y1e4w,zm btts0f 30 m/s. (only fill in numerical value in the bl.*eu0hdt3z, b1. vs wfmet4 syanks)
(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 uqcq, n/vr,zc* p into the air with a speed of 28.3 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 1 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 6 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 6.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1 r5fm h1oapw+si p*/jqw6 ..k)akyhg3.0 s?

  In Fig. below, what is the velocity at t = 2.5 kb*p)8 r/3kdvrns ul+s?

  In Fig. below, what is the velocity wa6ovo)j ; t)bat t = 4.0 s?

  In Fig. below, what is tezherdqc +zh0 nh8-:k1jg 32nhe velocity at t = 5.5 s?

  In Fig. below, what is the average velocity from 0 to 4u dbk8( z+) xzwuh(1hc.0 s?

  In Fig. below, what is the average veloca1wrqpts 5u*o3c4 vq (ity from 0 to 6.0 s?

  In Fig. below, what is t:2i 1i vopa/dt+(ejamhe acceleration at 1.0 s?

  In Fig. below, what is the acceleration at 3.0 s h) kv+4 i(:lyt,jle7a/avaqs?

  In Fig. below, what is the average ac:pzd. 1xufys 9jlky+7celeration from 0 to 5.0 s?

  In Fig. below, what is the averav 8a(c) s.izb ,6vkjivge acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement fromk hq9y7 5fcg2l 0 to 8.0 s?

Does a car speedometer measy.)km-.f,axd.fg 3hh(efrhx ure speed, velocity? {speed|velocity}

  An object can have a varying speed if its velocity is c4 plg/ f n5f/07dsh sl0zn-dytonstant.

  The velocity of an object can be negative when its 7bb:,1u6usv byuc9 nu acceleration is positive.

  If one object has a greater speed than a second object, the first must have a nj x(-e/fm0f .pxzo5x greater accele(x0peofj.- fm 5/x znxration.

  Two cars emerge side by sidz4x -x1e) tx)qtn e-rne from a tunnel. Car A is traveling 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 its acceleration decreas:koz)6:q,zsgq)r4y2vn6 h zcyoby4 ves.

  A baseball player hits a foul ball straigh a8d(buc w4i9ie7 4nry ,klp6at up into the air. It leaves the bat with a s y(kui4ln9,d apr4bi we8a 67cpeed 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 h+ 3k8bf+wq1*frieofbi zk8: c appening to its acceleration, how does it c*+ wik +f 1f3ekbizqrbc88:fohange if air friction is ignored?

  As a freely falling obj5zpo8hwwce63qj y+/gmx , hx,bk ya45ect speeds up, what is happening to its acceleration, how does it change if air friction CAN NOT +x/ w4gphm5yj83o, z6ek5ab cwh,xqy be ignored?

  An object that is thrown verticall8:5;abuy w.t-vn deiv+(i msoy upward will return to its original position with the same speed as it had initially if air resistance is neg-i(s5n v m: veo;b8iwu .tayd+ligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonze 4mvhp,ish5swtn82.d ro acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the sa; k*+- c3i bd1bbj3fzdobap3ome time.

  An elevator moving from the second floor to the fifth fl c: alobg0)w s;ij:cz4oor making no stops alon lw;b4zgao)::j0cis cg the way has zero acceleration all the time.

  A rolling ball moves f( ihno flhb,,(rom $x_1=2.4 \mathrm{~cm}$ to $x_2=-5.8 \mathrm{~cm}$ 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 $t_1=-4.7 \mathrm{~s}$ is at $x_1=3.2 \mathrm{~cm}$ and at $t_2=3.5 \mathrm{~s}$ is at $x_2=8.1 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aroc +khvq4xjd ( e9z4cka50 *fxnund a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.5 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 105 m away in 88m1q+):ylar xl3zyc t.1 s. It then turns abruptly and gallops3zry8 +1xlc ayqtl)m : halfway back 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 fr hcuondit0:ug614/mrv8n;v wom $10 \; m/s$ to $23 \; m/s$ in 5.5 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 fromo m7i5t6krr)r3noma 9 $17 \; m/s$ to rest in a distance of 56 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed o:z9.+ txrdk8q2a:ulff,wfm 2h r j +yif $25 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essentially td 4 axon+:ncz/3f 4prpop speed aboutxo+: n rpp /zan4c3fd4 $10.8 \; m/s$ in the first 13.0 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 uniformdbs ( itva7)pg1t9;woly from a speed of $17 \; m/s$ to rest in 5.15 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leavq)jzv, :yod8x )zno 5les skid marks 92 m long on the highway. Assuming a decelerlo:yn)qozz)8 djv,5 xation of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truc,22nqxan :o6b wt.cbm k 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).    $m$