Suppose that an object travels from one point in space to anot:ng4 6dx7cmf vher. Make a comparison between the displacement and the distance traveled.fmxgcd:n64 7v

  When is the average dop/fw e8 i 3(5nghn 8xiisgt(6o **qkvelocity of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty)x4 - :zbfbjozx2b t,a in 8 s". This is a descriptiox,:xo tzbbz-j)b4f a 2n of

  An object moving in the +x axis experiences an acup8;xk ox 8w;eceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins t (s3;gl. iom hjs9kd0xtpc u/9o slow down as it approaches9(h/jgdxk0op.lsu; tc9mi s 3 a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow down tynlvma*b+,, as it appnm *vt l,,+aybroaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is movini6idn gpcd7/,xp6o1( ayw;w ml8ah ;u g with a constant velocity. Make a statement concerningddlah1 6/;w(mi ;cnw7x6ipa,y8gop u its acceleration.

  If the velocity of an object is zero, does it mean that the acceleration is zqe v1w/1vb(dcero? Support your answer with an example.1cq/be w(1 dvv

  Can an object's velocity change direction when its acceleration is constant? gk7ceim tdr, 4tf*(rge- u5 z1Support your art -t( m7egd4 5eg 1iruf*zck,nswer with an example.

  Suppose that an object is moving with constant acceleration. ; nl+k1dt3b zz Make a statement concerning its motion with reszl;31 dbztn+ kpect to time.

  Can an object have incre *6+mel rdbowe9/ z7ryasing speed while its acceleration is decreasing? Support your answer with ayrl9d* +mb z7e/eorw 6n example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice.o; e wemn-+x*b6as.xw Make a statement concerwwx*6;see n. axm+-ob ning its acceleration.

  Under what condition is averageno) klj78c-bi velocity equal to the average of the object's inicjkb78-o) nlitial and final velocity?

  Objects A and B both start at rest. They b2y s7coo+o;9-ga3jk oc 3 sjwfoth accelerate at the same rate. However, object A aca9;c2-fos3 7soc y jgwo3kjo+celerates for 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 start frx 9f7fgw*; 2gd0grirwab8 ey 7om rest. They both accelerate at the same rate. However, object A accelerates foi a707e9grbg *wy gdfr28xw;fr twice the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is releybh*ixl6l v2ud ,q+*iav 30 icased from rest and falls in the absence of friction, which oldu qv *l*0,i a62i cxi+3hybvf the following is true concerning its motion?

  When an object is released from rest and falls in the absence if;*b3k cqtb3 7winba(j)ka) of friction, which of the follow k3* a)(ncjqib;t3) fk7b biwaing is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the 0, ptupzgt,;lvelocity and the acczg t,0pt lup,;eleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its accelera im:eev3rmv/6 q6ln .ution just before it reaches its highest p .rmmvn/i6:u3leq v6e oint?

  Suppose a ball is thrown strra m0 c6mh1ytxviy h(/20d(zy aight up, reaches a maximum height, then falls to its initial height. Make a statemen/vx c(0h1ay iyh0ym62t(dzm rt about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls to2yhp9o :7 ojztpj7 zq, its initial height. Make ap7oy jphz,z7ojtq92: statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in 7a;c6k c ).wbq1cedctthe absence of air resistance. Make a statement concerningdbw1;cce)ckqt 76 a.c its acceleration.

  Suppose a skydiver jumps fq-vx3oph1 ei(y9 : r. ikc2yjcrom a high-flying plane. What is her acceleration when s ykcyr2 i1(cj.o93p-iq e:vxhhe she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical secon:v mz5tuxg2rsj9 3 f/by9d v.s8v 4clgd 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 many times higher does the second ball go than the first bv4vl 2v5rj/9sz y.gb 8dcxtufgms 93: all?)

  Ball A is dropped from the top of a building. One second later, bal-xa:z stxo 3ns95gcx0 l B is dropped from the same building. As :-x ns asxc5093toxzg time progresses, the distance between them

  Ball A is dropped fro/f9zsezink2kq nol q4.n(5z8 m the top of a building. One second later, ball B is dropped from the same building. As q/8qnz z9is4 5nenflokk2z.(time progresses, the difference in their speeds

  Two objects are thrown from the 2tffcg6 3 )-khfgkn 7itop of a tall building. One is thrown up, and the other is thrown down, both with the same initial s2- g7gi6 nfcf kfkht3)peed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second b5capw3ktn z1iim. 5jx6he 22 yrick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerahj.i 5 6ixem3a2 wnt2z1 kpyc5tions of the two bricks.

  An object is moving with constant non-zero velo41i fj qwz;9zxcity in the +x axis. The position versus twq4;x z1zijf9ime graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. af9 9r2byv2 rr4uv4 vq7d jsh5The position versus bd4j2fa7rv yh2 qrvrus9v459 time graph of this object is

  An object is moving with constant non-zero ve-n w qr8y7+bslqu7* xclocity in the +x axis. The velocity versus time gq*uyx-rnqsc 7 8+wlb7 raph of this object is

  An object is moving with constanh ji8o cg8x/)lt non-zero acceleration in the +x axis. The velocity versus time graph of this object i cj)o/hlx 88igs

  The slope of a position versus time gr7zvb7iq z1d0 jjp(a0 eaph gives

  The slope of a velocityh3k /+o-bmvcm versus time graph gives

  The area under a curve in an acceleration versus time graphb-0yxf+ yao :s gives

  The area under a curve in a velocity versus timn,-ik fmwy( b3rw72uo bajd:)e graph gives

  If the position versus time graph of an object is a horizontal line, the o3 sjky3hf+x*lbject isy* f3ksl 3hj+x

  If the position versus time graph - o+/ i- jeq(/yqcjospof an object is a vertical line, the object is/qe i s-oy/j+jqp-oc(

  If the velocity versus time graph of an object is a horizontal line, thetzr6 pu,lv s)ye-/b:lyk+ k8h object ,vlps hly b) +8k/uzytek -r6:is

  If the velocity versus time graph of an object fdwt dk;pd unc g6;(ge8 8leh;k )4rp:is a straight line making an angle of 30 degree 64; 8dcrp(eg wkk endpdft;):lhg8 u;s with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m so o7m5l,zl 5/wt6hgrvauth. Find both the distance traveled and the magnit/z5wmltv76l gr ,oah 5ude of the displacement vector.

  A boat can move at 30 km/h in still water. 188+ew*p wz9ss ysatc How long will it take to move 12 km upstream in a river flo+e sp*zcwssy18 9wa8twing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi =7rjz,ey.-b bh w-tf3h 1609 m)

  What must be your average spee*oam9t3 j d qwq9s;z,-getfux0*mq.td in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours o+ nmslwa*gj 2qi ohq3 4(*e2lhu.eg6 and 57 min. What is the average speed of the runner ll4(ua q2mh.e2wgo6*ns h+oe 3iq*j gin m/s?

  A car travels 90 km/h. How long does it take for it 2 /(:hovqvudxfm * b/eto travel 400 km?

  A ly (light year) is the distance z y3-ku s3knc9h:ikz 7awc88zthat light travels in one year. The speed of lighu h9z8 y-kzw kcc7s ai38:3knzt 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 a4,ne5anxt,u : xp616la bkz oo straight road and you look to the side for 4.0 s, how far doxxtn oe6a,:6p a 15oz ,n4ublk you travel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your avera 14dsq (ym p;6ayx-aqlgea qad p41yx6my;q(-l s velocity is

  A polar bear starts at the a1envlmbmw9-*:3 n ;jzc xg 2dNorth Pole. It travels 1.0 km south, then 1.0 km east, g3l :2mjcvne ;*1wnm adz-b9xthen 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 North Pole. Ito7 mx ie,o4 i1pu+at/r travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 ra/p+1e7oi m,oiu4xt 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 frh0yrw4toqs dl2ws.z:fn, * -bom 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 hometow *wzsotrl04- .ynw2,bqs:hfdn from school?

  A motorist travels 160 km adfhla( vjxx8dk/). t-t 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for t()l .xvatd f/ 8hdk-xjhis trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What iskrwr 11l)o- cku.ep1py-dh *b her average speed for the triky. wcoh-l1pk-b1 *1)eprurd p?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north27w ij ;vmis3q for 750 miles. What3mvi iw ;j7qs2 is the average speed for the trip?

  In a 400-m relay rac p:r,jp cfi,c1)i e1obe the anchorman (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 1fppc rbcie),1ji, : oin 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 14.; y3pelef7ed s. The car's average velocity during deceleration ed;f 73plye e.was 44 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed ojsi)r-z, w: lfrom 100 m/s to 160 m/s, at the average rate of w )-j,szio r:l$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km b7x.z3508 kw+uyggn; ezeso m/h accelerates 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 u*8by0d6 ci3tyxes. q 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 accelerati/c.5,egxdh pqtaa7(u on of 7(xa. d/aeu5, tchpgq $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 4.7 mz5ohy:( .7 )uycehc7(x qkasr/s experiences a constant acceleration of 7rxhko:s (cuah(5.ecyz y 7)q$3.3 \; m/s^2$. What is the cart's displacement during the first 9.1 s of its motion?

  A bullet moving horizontall:7(mk5 4,jaotpgdm e gy to the right (+x direction) with a speed of 506 m/s strikes a sandbag and penetrates a distance of jd mm5gpot(a47 ,ek g:53.63 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is )d;jgdcqpp521 e +hrylaunched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of thd 1+jep)qp;rh dcg5y2e catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from (bexhrmt a6 l:p:evoa xb1u40*.2wso rest 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. Wh i.v i0wj 4dt5m1sncm/1 (whkl i rq*s4h/xfz4at is its average accel1i4 nzfk14c4 /m jwqd (lw/.5msi iv0rht shx*eration?

  An object starts from rest and undergoes uniform acceleration. Du j/ gjjfig36rk1 u/ o23gjj,ryring the first second it travels 5.1 m. How far will it travel during the th jgggj3f,12ji6/r uy/3okjjr ird second?

  An object is moving in a straight line with constant acy n njr-pic+/6vr+a8u celeration. Initially it is traveling at 16 m/s. Three seconds latjunn/ 8+ va6rrc- ip+yer it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accepowt-pmsjx .+ :p/ov+l4 0fpi lerates 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 *druc 5py /iw, pt6k*kat 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, a5 jq;uc mn jb6nv .o(cn* qny390ravi, car that has been waiting at the intersection starts ahead with a constant accejj *nrmb,noa 9qunvi03n(qv;. 6c5cy leration 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 m/semwiggd a/ epqg 5+ 3s06bs0-;jqb .1vhxhz3t on the surface of planet X where the acceleration due to gravity hw03et x+jqvbq5 -s a0s.gzggdh 3m 1;p/b6ieis $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown ypix-,r3 xz9cc/j6cf3fs7stupward with a speed of 12 m/s on the surface of planet X where the acceleration due to3 -z6cfjsc xfrspcy /i,79t3 x 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 s qx/*0zaxx bt5peed of 15 m/s on the surface of planet X where the accelerx5*0axq xtbz/ ation 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 w72u kv1aq x6na02bm-va 6szoh ith a speed of 14 m/s on the surface of planet X where the acceleration due to gravity mv 1ok 6vazn6sqb20h au7x2a- 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. epb;+vkiy/nql /6j3j ,b uj s/ If your friend holds a ruler between your fingers and releases it without warning, how far can you expect+bn3s l /j;y kj/,/vibep 6quj the ruler to fall before you catch it?

  A ball is thrown upward at a qa lz)-)4bw twvelocity of 19.6 m/s. What is its velocity after 3.z4a w))btw ql-00 s?

  A bullet shot straight up returns to its e domu.3o 3aj9,uldps jv 7d69starting point in 10 s. What is the initial speed of the bullet?9.ule6j ov73,39pdoj add ums

  A ball is thrown straight) zm.h (o9dx o8v, iqn0qic2fl up with a speed of 36.0 m/s. How long does it take to return to its starting point)vf.oxq9n o0lz 2d iq,8(mihc?

  A ball is thrown downward from the top of a building with an initibi5sqm:csloh v 203 53 d;d6f-4kw knk8mqly oal speed of 21 m/s. It strikes the ground after 3.0 s. How high is the buildi63 dbi45;35vsqms h:wkmyod-cknqll f2k80ong?

  A ball is thrown straight up with a speed of 30 m/s. (only fill odmg40 e 2abqajp6/i8 in numerical value id2ajgb6m oe/q8pi0 a4n 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 28.3 m/s. ( r 0qze1xx)vt.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 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 )yjrksrsjsj(4 79h r7the velocity at t = 1.0 s?

  In Fig. below, what is the velocity at t = 2.5s 9t3icxio/,hx2cpqy he x,2/ s?

  In Fig. below, what is icl5fnhy2;sjk a,:,yrn w; vl,ka/k0 the velocity at t = 4.0 s?

  In Fig. below, what is the veloc9 2 wx-bu5y+qfyd yqa+ity at t = 5.5 s?

  In Fig. below, what is the average velocity fr ovoyxrsz7*r2,3 yh g7om 0 to 4.0 s?

  In Fig. below, what is thehs7yyq5s*lc ; average velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration a ryuisw o2)q:1+.taapt 1.0 s?

  In Fig. below, what is the accel;k*jmi g 5x(vj1(t wtheration at 3.0 s?

  In Fig. below, what is the avlzd()wk i; aj)erage acceleration from 0 to 5.0 s?

  In Fig. below, what is ,wcbm+:p3owy2jlnh9on f :5/c q.0xf 6netql the average acceleration from 0 to 8.0 s?

  In Fig. below, what is wgg m o58;m,nwwu:td 7the displacement from 0 to 8.0 s?

Does a car speedometer +e :vn4sf ,f x;qz7uzkmeasure speed, velocity? {speed|velocity}

  An object can have a varyifgk0ocq4k a,y63d, rx1kd i7 ang speed if its velocity is constant.

  The velocity of an object can be nypkdlf hz;o l- *3b9s)egative when its acceleration is positive.

  If one object has a greater speed than a second object, the first muv9j -,-xnpv,zu3 tpee st have a greater accelerati9np 3uz e,xtj -pvve-,on.

  Two cars emerge side by side from a tunnel. C/ 46cv 8uof qm 9a:hq;njet)td y0qkc6ar 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 ofhkjo0 ,gwhq pr() .f:c+x+tspb80cdn) if:acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves -m x.hje30 snudvfv20the bat wevumhn0.d03 fs jx2v-ith 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, wh7nxdzge e yf/3l eb,43at is happening to its acceleration, how does it change4g b/een33fzxely7,d if air friction is ignored?

  As a freely falling object speeds up, what is happening to its acceler(p:ij n:oon qp:/q)pi7o)nsx9b . r yeation, how does it change if air fricti7q xoe().js o:: :yp)nbnq op/i9 prnion CAN NOT be ignored?

  An object that is thrown vertically upward will reysdzz 94zz+h8q8bnj 7 turn to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, zh8z7db84jnyzz q 9s+ how will this result be altered?

  An object can have zero velo8in;*udd e/ drcity and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the s8a-ug4. yxqkv ame time.

  An elevator moving from the second floor to the fl.d9i c js*.kqtq+x. 4awqw oxd)3) ytifth floor making no stops along the way has zero accele)y 4txq.ltdw3sk qao.j9i *)qdcx +.wration all the time.

  A rolling ball moves fro3t.o40g:b,-ai myem ficry9 a ,q1r gvm $x_1=2.1 \mathrm{~cm}$ to $x_2=-5.3 \mathrm{~cm}$ during the time from $t_1=1.6 \mathrm{~s}$ to $t_2=5.8 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.5 \mathrm{~s}$ is at $x_1=2.1 \mathrm{~cm}$ and at $t_2=3.0 \mathrm{~s}$ is at $x_2=8.1 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight c b ,15/kcw,ksvm)7brwzvr g a;omplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.2 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 91 m awap1kcau82 ekj3y1 pz 2ay in 9.4 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate (a)1aup8e2k ay 3pj zkc21 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 fromu, 70x uyajr im+r(5fa $12 \; m/s$ to $24 \; m/s$ in 4.1 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 fro*bjm4f 31lx edpti*r 91sf;t;mz6 sznm $21 \; m/s$ to rest in a distance of 73 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach m 8;k+cafa,7q l/yfb,bp1g o ra speed of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.8 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can pyx gr;p0n n23w4b8udlju,4dburst out of the blocks to essentially top speed aboutn8ld0, nd;pxybupu4w3g r4j 2 $10.8 \; m/s$ in the first 10.3 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 aimpg;p+f sp398 w:tcqn *uf d20e.5o eig6eze speed of $19 \; m/s$ to rest in 5.90 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m long on the ho6/06mzrpz y1 2apmp+pzn+ ywighway. Assuming a deceleratiompapmzpyryp6z1 z+62 0n+ o/w n of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck vw9b /k .0k3d9q5b zs k+khuzdgoing $25 \; m/s$ 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).    $m$