Suppose that an object travels from one point in spacer48dozs .jp +m to another. Make a comparison between the displacement and the dij+4m.r8 pdozsstance traveled.

  When is the average velocity of an object equal to the instant i,lz4vx y,*gpaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixt -gj/ol)fe01 a k,mvth gki77xy in 8 s". Thisi kg,0a1)h/ lx-etm7j7g of kv is a description of

  An object moving in the +x axis experiedpbzx/95dgj1 qg673o4vb u rhnces an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to thooyh.j;su6l /e East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning lj uyoh. 6so/;its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to slow downciox.x/.ygp5 iivpa o8,3l- n as it approaches a traffic light. Make a statemenlp/ac. p -,o3 i8vn.oixy5xigt concerning its acceleration.

  Suppose that an object is movinggh5ogcb150 psp(k: du *pb2cd with a constant velocity. Make a statement concerninpup5b5kd:p 1gbdg(2shc*c 0 og its acceleration.

  If the velocity of an obj*2q)aq 91ozei m*qlw fect is zero, does it mean that the acceleration is zero? Support your answer with an examz9q ow1q2* )flam* qeiple.

  Can an object's velocity change direction when its accelepc+tbw ft983ukm 6if1 5;a taaration is constant? Support your answer with ant9 u;pckmf6b5 183 tif+aaw at example.

  Suppose that an object is moving with constant acceleraci9*f5ep w1m *oi :zxbtion. Make a statement concerning its motion with resix c opzmf9iwb1e*:5*pect to time.

  Can an object have increasing speed while its acceleration is decre;ex5o)edf i-j ;j ojb;asing? Support your answer ;j;- oe;dij5) ofje bxwith an example.

  Suppose a can, after an initial kick, a em(f.le+/m(mab8mh moves up along a smooth hill of ice. Make a statement concerninge8((a+mafml m b/h m.e its acceleration.

  Under what condition is average ve+p3s2k llvweq75ck 6 w . me6 wmyk8hszgh::y2locity equal to the average of the object's initial and final 7l mk .yq :w5w+w6eyk3vhmh 2:6zs82epkslcg velocity?

  Objects A and B both start at rest. They both accelerate a* zc +osq juiy840s.rat the same rate. However, objec*ryaj 0zcs8.u4i+ o sqt A accelerates 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 from rest. They both accelerd4e700euc p sxate at the same rate. However, object A accelerates for twice the time as object B. What is the distanc0 ue x4e0dsc7pe traveled by object A compared to that of object B?

  When an object is released from rest and falls in the ab6 3dpio/ c*ktfsence of friction, which of thet p*ofck36/id following is true concerning its motion?

  When an object is released from rest and falls in the absence ofh)g4j mg5f 3rc friction, which of the following is true 4fgjh)3 rcmg5concerning its motion?

  Suppose a ball is thrown straightg;+zin .; o (cw6xe-ouhgjf.i up. Make a statement about the velocity and the acceleration when the ball rch6ew+.o xz(u- ji n;f ggi;.oeaches the highest point.

  Suppose a ball is thrown straight up. What is its acceleration just beforei geps5x: e 2 cb822mmdijl1un7u9-u z it reaches its highes i pum xil z2su29-58d buejgmn271ce:t point?

  Suppose a ball is thrown straight up, reaches a maximum height, then fallsh: zd h c9m8p(8o6xrrr to itsprd:c(h8x6 moz8rr9 h initial height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maxp u(y*bj2ad1v59 t+cf u.irkeimum height, then falls to its initial height. Make a efyij2rk9ap(t . b*5duvc1 +u statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Make a stavxl, rm+:)ukyw,z l: ym6xmj2tement conly6kr xm ,xmzv:u:+y2w jl ,)mcerning its acceleration.

  Suppose a skydiver jumps from a high-flying plasu7y: w, b+omgne. What is her acceleration when she she reaches terminal velocity?m+wo:u ,s7bgy

  A ball is thrown vertically upward with a speed v. An idenw 8-kh e3i;ee,amfiv kziri f/v31y6-tical second 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-, 3 zekiw f;h/eveirm ikf8i v1y-63a ball? (How many times higher does the second ball go than the first ball?)

  Ball A is dropped from re;2s)nx 25yjzrb 1x5- xkongthe top of a building. One second later, ball B is dropped from the same building. As time progresses, the distance between themkrzney-j s15bx)5 r2 2x; xnog

  Ball A is dropped from the top of a building. One second later, baljs6dzir.f(: ihbobxw2)b8/ cl B is dropped from the same building. As time progressho :i)bswb f2jzri6c/.b8( dxes, the difference in their speeds

  Two objects are thrown from the top of a tall building. On9jp*l5dxm, x2io :vc.mkjp)n e is thrown up, and the other is tmn. povk)px:*i59 x dl j,2jmchrown down, both with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thrown straigap**us9 uk7x4ewuqb/ht down from the same building. They ew*qxu/4 *psub9a k7u are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-z9klpm +w3(ae gero velocity in the +x axis. The position veg(a9ke mp+w l3rsus time graph of this object is

  An object is moving with constant non-zero acceleration in tfueggi2pm 4ntof ,hq/ fhq6n+),e : 26x3 uyeche +x axis. The position versus tim:,g23 e6c f4ymxo h/)hun nqfq6ptui eg ef2,+e graph of this object is

  An object is moving ngxn;h0jmvqo8*j,* kwith constant non-zero velocity in the +x axis. The velocity versus time graph of this obje ,ng0k *xjqhjn8mvo;*ct is

  An object is moving with constant non-zero acceleration i*p,am - q+gb 5*xvina oxlo;8m-r4y dmn the +x axis. The velocity versus time graph of this objera + yi,vlm*o* 4amb nxmogx85-q-dp ;ct is

  The slope of a position verdlx(t ay lds.o34 :/rb.uc,bv sus time graph gives

  The slope of a velocity versus timenbcl:0q80t-ay 6epuc graph gives

  The area under a curve in an acceleration versus time graph givw c(q/x fu)7s-)dxou/p ynf2tnqn7/ jes

  The area under a curve in a velocity versus time graph g*e7o; b xk0skiives

  If the position versus time graph of an object is a horizontal line, the object / :r tydgp/iq(is/gqtryi (:/pd

  If the position versus timei7. pm : c:s k-id2+d ldu-izy6rxxdc0 graph of an object is a vertical line, the object iscux::c.06l p x ri+ yd2id-zid-7kmsd

  If the velocity versus time graph of an objecgm; u 1 20b tfd:h8b;i8tjp mn5zirv/jt is a horizontal line, the object isgnj5r8 m0zm; t2/:u pfjiv;bd18hi bt

  If the velocity versus time graph of an object is a straight ling1 *ttywox ve8-v9g3i5qk j9ne making an angle of 30 degrees with v t19nvtoexk 98g3j 5 wi-*qygthe time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both th71sfrs 2a4s ghe distance traveled and the magnitude of the displacement vector.4gash27rfss1

  A boat can move at 30 km/h in still water. How long will it take to move6z )n1zrnz yx9 12 km upstream in a river flowing 6xn6z1 )yz 9nzr.0 km/h?

  55 mi/h is how many m/s? (1 c (oav.a9ly w 9;meykfn8x6i2mi = 1609 m)

  What must be your average speed in order to traespm(.b.r;,7g 2yxqkm(* nc thp .ykbvel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57o2 b9z4aar q7f min. What is the average speed of the runner inq4o9r2af7 abz m/s?

  A car travels 90 km/h. How long docq* lecl z*b 0 kq1bgd7)xau69gjb 48zes it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. Tho8dvw2e: /a iie speed of ligi8 v2eiadw /:oht 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/h3 zj7fu* bj7pz8g8iim )rmx8a along a straight road and you look to the side for 4.0 s, how far do you travel during this inamb8 ugjjf pmi8r 7i)z7* 3zxa8ttentive period?

  If you run a complete loop around an outdoor tracktf.n 1:u,ubhk m(vm8y (400 m), in 100 s, your average velocim8.hk(unftb, 1v y:umty is

  A polar bear starts at the North Pole. It travy, ; -.tcc5gxua2;qnfr/p wety s3r3gels 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 was the bear's average sp 3p/xq3sg;gwyc rtra-nc.t2ye;fu,5 eed?

  A polar bear starts at the North :dv50 ikyunrmwkzb- 6 +7oyt :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 45nwk ry07m-:t5 uo :+i bd6ykzv 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 thab q,usbecz).bi 09ajl 1/z,hen starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from scij9/qz1leuha ,cb b bzs,a).0hool?

  A motorist travels 160 km at 80 km/ho x b*2j6:wvzt/zfu :o and 160 km at 100 km/h. What is the average speed of the motorist forvow o/bu*:z f2 t6xzj: this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. Wh vet/t, l+-jv t1yj.cnat is her average speed for the trip?v/cnjve. tlyj+-t1t ,

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north foj*j;4wf, q qrlk g6s*er 750 miles. What rje *l,46kwgqjs* q;f is the average speed for the trip?

  In a 400-m relay racc ph -d.y,3 md(sgmd/ro3w jb6e 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 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 rojgb-cm,( wd drs63pm /y d.h3unner not lose the race?

  A car decelerates uniformly and comes to a stop after 9 s. The ca1s8ec.qah ;byr's average velocity during deceleration s.8;1 qahycbewas 60 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/hhzx admybvsf8, i5:8+2)re :vn*.iv /m v omes to 160 m/s, at the average rate of ve:,rihx ms) mz:vb*df2 mv8 . e+nho/i58vya$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceleratesi6 / to5w.pcq 61q/km siiw,ty 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 ac8e.yp)j5 9zgbbifx,d kep))g celerates 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 wbjggfmd i3 40)wcu22constant acceleration m0 2 )fgb di3ug2c4wwjof $2.0 \; m/s^2$ 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 gh i*:ig+xw;tt/9hp)nl4e ypz/j0gdacceleration of yn)9 zi 0+/dip;g4pj/h *xtgthe lw:g $1.0 \; m/s^2$. What is the cart's displacement during the first 6.4 s of its motion?

  A bullet moving horizontally to the rigec (p rhlte,95ht (+x direction) with a speed of 469 m/s str9h( lrtp,e5ceikes a sandbag and penetrates a distance of 93.90 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrier. It reacip,xei7 7wp9h em 42jkhes a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant7ph4ipee 7,9k2xj wm i, what is the length of the catapult?

  A car starting from rest moves with constant a87suo;e vprxj9/s by,cp 4 h6zcceleration 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. i j)z kw)z*frbc:br3(5gevbsoj/:c1 What is its average acceleratg1/r*f zbecjo: :k3wi)vbjcsb z(r) 5ion?

  An object starts from rest and undergoes uniform acceleration. During the fic 0pr2ex2m*r4bu va l8rst second it travels 6.7 m. How far will it travel during the third seconpc8u2brax0elrmv *2 4d?

  An object is moving in a straight line with constan8pp2 -ya5nsr,eny 2nkt acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does ity2- 5a nn2k,8pnr psye move during this time?

  A car starts from rest and accelerates uniforml*( 5lmkpl9 l. z5.jd vxdok:qly 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 drye af2vzvb8sl:n,jiku 8(d8f7 road can decelerate 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, at*. mng(++pse zat 9wh car that has been waiting at the int +spt *thaw9(e.gmn+zersection 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 ;s011rvt(ngh 5bquti 12 m/s on the surface of planet X where the acceleratinq1 i; s5r0 v1ugb(htton 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 the surface of pla(zo png9c;b1/ 19yx f5 5t*tphbrnvvonet X where thp btt;yz oco5(p hnn v1bg991xv5f*/re acceleration 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 speepkgy:3*wxj i (a)b4xed of 15 m/s on the surface of planet X where the acceleration due to gra (wg *x3j4):axek pbiyvity 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 whez2e2t90ysb j dxgq 9x0re the acceleration due to gravityygjed9x0 xb029q 2tzs is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greater thav swaf.p/a .57 5g0kr cct)fgtn 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, hopa5cf r kws.7t.a vt5fcgg0/)w far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after 3t-e7v0 dpczaup(75fi .00 -p eau0 idvp57(7ztf cs?

  A bullet shot straight up returns to its starting point in 15 s. a8( r od94 lqog5n(mksWhat is the inimqko4l9og(ra( nd 85stial speed of the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it tak *l6myea2-1r c8 bwykpe to return to its startinw ky-2mpc6r1*leab y8 g point?

  A ball is thrown downward from the top of a building with an initvs- xz. 3gjl0tial speed of 22 m/s. It strikes the ground after 4.3 s. Hjgs zv-x.3t0l ow high is the building?

  A ball is thrown straight up with a d g81 -bz/pgrmspeed of 30 m/s. (only fill in numerical value in therpg g8-/dm1bz 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 waya/)ui,py.t f92k ;ge b:ah the air with a speed of 45.4 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 9 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 9.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is theh9 g mmkl,p 33b )se-p2b6sotd velocity at t = 1.0 s?

  In Fig. below, what is tm8 8ra/2mt ltbhe velocity at t = 2.5 s?

  In Fig. below, what is the ve9z;go;tku*z a locity at t = 4.0 s?

  In Fig. below, what is the velocity at t = z6y-w3g8ij+ q7ldn g f5.5 s?

  In Fig. below, what is the avr,k)8y pvztp 3erage velocity from 0 to 4.0 s?

  In Fig. below, what is the average velo rl 9 :exqe(t h)vez-;(exmu+fcity from 0 to 6.0 s?

  In Fig. below, what is the acceleration2:hhr4:nr ey 7cfe.l a *1fuvc at 1.0 s?

  In Fig. below, what is the acceleration atb c;4tq9d-qsr5qi2d k 3.0 s?

  In Fig. below, what is the average accel-l2b+vnl17* qprk 0p iyg qir0eration from 0 to 5.0 s?

  In Fig. below, what is the aveq4 c xv* 3p.bjolz(kp7 d6lpx4rage acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8-k,viyg/ s7t 98dpvfj.0 s?

Does a car speedometer measure spe )-* 2v0puzvm2ecaftz ed, velocity? {speed|velocity}

  An object can have a varying speed if itc5 96d lug;xems velocity is constant.

  The velocity of an object canuk. 6u bnx+kzp68tkgv+sf ++vxue2i* be negative when its acceleration is positive.

  If one object has a greater speed than a seco6f k/vwjii.3- kcxz,xnd object, the first must have a gre ,xj/kkvi63.ci zxwf- ater acceleration.

  Two cars emerge side by side fro z(jdm*(0s fvpm 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 itc qcr*,9wr 6sv/j4xgt7 u qdy0s acceleration decreases.

  A baseball player hits a foul ball straight up inpgm:4npwbj2 if.w f7n9(ra0 juz6k :nto the air. It leaves the bat with a speed of 4f 7( bpn 2 wur nnkiz:pfg0mw9aj:.6j$120 \; km/h$. 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 y yn5-lf;bdw-object speeds up, what is happening to its acceleration, how does it change if fbyw -y5dn;l -air friction is ignored?

  As a freely falling object speeds up, what is happeniku,pw7o)h; od8r 8a w,ya.okpng to its acceleration, how does it change if air friction CAN NOT be ignawok7,o hupwkor;.d,8p ay8 )ored?

  An object that is thr6 3 *eaizp9xgfown vertically upward will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be *i pz639xfa gealtered?

  An object can have zero velocity and nonzero acceleration at the same timelnx o krz(f5 /c/b)w8p.

  An object can have nonzero velocity and zero aw+yg*34vj9vnuy i7sacceleration at the same time.

  An elevator moving from the second floor to the fifth floor ma 8*m bv24 7psnu6hkvhsking no stops along the way has zero acceleration all tush mvhk6n* 8bv2s74phe time.

  A rolling ball moves from0n 5 r4eu)ktt srl*08i iohof5 $x_1=3.3 \mathrm{~cm}$ to $x_2=-6.5 \mathrm{~cm}$ during the time from $t_1=2.3 \mathrm{~s}$ 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 $t_1=-2.9 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=3.4 \mathrm{~s}$ is at $x_2=7.9 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps ax(h 7-nk.d ks cxc46ljround a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 9.4 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 112 m av5h:+ a7grqd 1d7sbf1c xzg.fway in 9.8 s. g.g:fa7+1z5 h7fdq1 bsrcdvxIt then turns abruptly and gallops halfway back in 4.6 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(.g x6idas(x(pqu *q ,p( ccbw $11 \; m/s$ to $24 \; m/s$ in 4.8 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 froms mmoki+rj3g*n0i l e.7e9h 4o $17 \; m/s$ to rest in a distance of 62 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a s()fuldi7u1y bptv f(:v:7 s ktpeed of $33 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.9 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst outzwz(jl b)w,(ekh+c1z of the blocks to essentially top speed aboutkc,we+(bzjz 1h (l wz) $11.4 \; m/s$ in the first 14.4 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 speed ofwn es66g9 4olv $17 \; m/s$ to rest in 5.92 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 (:+7zg+lvot5nf7 ly pbkie+:+3m te cbp/kjlon the highway. Assuming a dec zmn3kgl:(c77 /j l+lb5oktte ypb:e++ +fivpeleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tru5tg-l8i z*nxbyxjh) 50erm0gck 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 comp0qc3 )s./se3pvt/jf 1agj p jilete the 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m t 0cqsp/e t3.3 1/ jvp)sgjiafjo go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$