Suppose that an object travel uh2dgbc 39*qkp1zvqs6,nh3e s from one point in space to another. Make a comparison be9zhec*,q3ug3 2h bpv1k6nsd qtween the displacement and the distance traveled.

  When is the average velocity of an object equal to thec mmuz+.0 vw3q5q4-r dvm403pvlwvgy instantaneous velocity?

  A new car manufacturei7r33/ e4wlg48 ynmyb srqrr3r advertises that their car can go "from zero to sixty in 8 s". Thir 7i g334yeml /3rqwrb4yrn8ss is a description of

  An object moving in the +x axis experieno8nhp(72l.xhi h ag5t3 e q9nno;n: uices an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begins to slow down a*3qv14athcaq hc7 5t gdz+f m.s it approaches a traffic light. Make a statement concerning its acgh31 q ha a7cm4z.tt+fq *5dvcceleration.

  Suppose that a car traveling to the West (-x dtkpsh51mfo 6xx 037 zwirection) begins to slow down as it approaches a traffic light. po3wt x 6kzx5 1mh0f7s Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocitylkc4u:/g 6s8c zhec 1y. Make a statement concgcls:1 ce6/ zk84 uhycerning its acceleration.

  If the velocity of an object is zero, does it mean that the acceleratiikh. 3hnah-kaz-.ns 0 on is zero? Support your answer with an ex.hk hs3. 0zihn-kn-aaample.

  Can an object's velocity change dirnic 8xvvlt*,s * 7drs7ection when its acceleration is constant? Support your a r7 *87svdv*sltc i,nxnswer with an example.

  Suppose that an object is moving wiq z; /b*pezhb+th constant acceleration. Make a statement concerning its motion with respect to time/+ b* hezzqbp;.

  Can an object have increasing speed wh*+9 8ata vimwpile its acceleration is decreasing? Support your answer with an e*pw+a tavm8 i9xample.

  Suppose a can, after an initial kick, movb7m 0 :)pbxihqes up along a smooth hill of ice. Make a statement concerning its :b0imx7q p) bhacceleration.

  Under what condition is average velocity epk .yiznw,zq20(b s*mqual to the average of the object's initial and final velocity?*pswymin0kz ,qz b2(.

  Objects A and B both start at rest. They bothm.p mmt f9a3xlsru58jgd20*h accelerate at the same rate. However, object A accelerates for twice the time as object B. pm j52xam9f drltsu3g.h 8* m0 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 a e)fzd,xs31y zt the same rate. However, object A accelerates for twice the time as object B. W ,zz3edys1) xfhat is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the abc*f6+ io 93ugszd(obosence of friction, which of the following is true concerndoo6 og(zu s9fbc*i +3ing its motion?

  When an object is released from rest and fall3wu6db*mpa/2rog;ce 7yf5 ais in the absence of friction, which of the followingi *r2/bm5o ;apugwf6 7ya3edc is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statemzfc(r. o2- ebrent about the velocity and the -rzoe2cb f( r.acceleration when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What i8agnocbsuud 0,h 0+f 0s its acceleration just before it reaches itu0suafn b +gcho, 080ds highest point?

  Suppose a ball is thrown straight up, reaches a maximum bfdyvxn d3v 8/ cniy(i) kbr.9; t8/nqheight, then falls to its initial height. Make a statemen8by xyi8t3 nnqvn ;kf/dr).c div(9b/t about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straip1pc;0 knju)1 61 ph ibujnk+rght up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of pn01)+;u 1rhupjknip b16cjkthe velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown down8sc)ld7:ha 1w9vmkof ward in the absence of air resistance. Make a statement concerning its acceleratiodl1 k)scaw7 voh9m:8fn.

  Suppose a skydiver jumps from a high-flying plane. What is her acceleratio(su d3 /zb)bton when she she r)3bzdo t(bs u/eaches terminal velocity?

  A ball is thrown vertically upward with a ew/ 2;j(hl r p pfol0t.9;rwygspeed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the rat .ry ;p(foet/ l2wprhljw90g ;io 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, baci+f.uch7va 5ll B is dropped from the sav icfca7hu .+5me building. As time progresses, the distance between them

  Ball A is dropped from the top of a building. One second later, ball B is droiea4pt0 7fwe1ph/i 5w,nc;bjl6x rj ,p( cb5upped from the same building. As time prog,wj;f a4,c eb5xp bj(cr hl1/piwp605nute7i resses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, anv,z2v 1(b/ojxq*xgp a )0mh,hkd so0qd the other is thrown down, both with the same initial speed. W2 h1 x,/m (0osk)qpa*0hvzxbjqgodv,hat are their speeds when they hit the street?

  A brick is dropped from the top of a bulfh+;r4x oq(y h1:rzwilding. A second brick is thrown straight down from the same building. They are released at the same time. +y:xfh;(orw lzhq4r1 Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity y p8dzqpf* 3;b06qp q0u gnf1*v*xzecin the +x axis. The position versus time graph of t pg*pqfxzzpqy*c01;q06f * u3ve8b d nhis object is

  An object is moving widev5 sdetx2 lk)v:.i)q d mx:3th constant non-zero acceleration in the +x axis. The position versus time graph of this objectte53dsd)qxdk:v: vml.e 2i x) is

  An object is moving with constant non-zero velocityiefx sw)tb+ip/ 0x,9f in the +x axis. The velocity versus time grapx,i tw/)pfe+bx sf9i0h of this object is

  An object is moving with constant non-zero acceleratioyil7 a 69e+6d;yhic htn in the +x axis. The velocity versus tihtca69+l7h ; y iidy6eme graph of this object is

  The slope of a position vula3d2 dkh 7e2r /eg1:roa3vn,0 j orezg-jf1 ersus time graph gives

  The slope of a velocity versus aqi1onm,k: y0 cn :ymn )k4i0utime graph gives

  The area under a curve in an acceleration versus timhz7l9 aeq2 t ub(kt4h0e graph gives

  The area under a curve in a velocity versr 3e (v8kom7mkus time graph gives

  If the position versus time graph of an object is a horizontal lin: h:b,xxkadk48ua y.ee, the object isxkyhk. x baud e,a8:4:

  If the position versus time graph of an object is a vertical line, the obp85/ru1aoka t ject isktraua5 o/p81

  If the velocity versus time graph of an object is a horizon)z8m)cq* mv+g 7;vsvo hku otg(rfah6k-uf.+tal line, the object vv 6uts);*q (f) aro-8hukhk mz7 gomfg v++.cis

  If the velocity versus time graph of an objecq;y( m ::xttxjt is a straight line making an angle of 30 degrees with the titxyxqj ::mt( ;me axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both tq,6xjx)im t,cl 4wg x6d,dsc-he distance traveled and the magnitude of the displacement vectdl,d-xgwqxsc im)xt4 c66j ,,or.

  A boat can move at 30 a 62rf 1jyn(hfkm/h in still water. How long will it take to move 12 km u 216yahrf(nfj pstream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 1 ;y (s3s25bgu-kaxl hwj, h72bx kobami = 1609 m)

  What must be your average speed in order2/inu;pu a i u3(c5 pkt9xm7zd69gdpd to travel 350 km in 5.15 h?

  A runner ran the marathon (aptnqd nd8kq 62l0re 9-yproximately 42.0 km) in 2 hours and 57 min. What is the average speed q-ln0 9q drtk2e6 nd8yof the runner in m/s?

  A car travels 90 km/h. Howqdud1-eu4 s:bujw6 oyw;)gw- long does it take for it to travel 400 km?

  A ly (light year) is the dis5b2i3ge0 0:p.5n y1 b dqecxgzq lord2tance that light travels in one year. The speed of lig 25ore bpqgxbi0d z5c32 :gd0lnqe.1 yht 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 ;j+sjl f*jyofz2-r b-road and you look to the side for 4.0 s, how far do you travel during this inattentive perj j;o- *-2+fsjylfrbziod?

  If you run a complete loop around an outdoor track (400 m), ilq8vds/h,x9 v 4w0 ( zrmk4uhl g*sc0rn 100 s, your average q lk/h4hcv 4uv*w0gr(0s8 ,l9dz rxsm velocity is

  A polar bear starts at p-t37w8/ wdc fit0vksthe 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 7w-sct/k 8di p3 vwtf0to its starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at the North Pole. It ifeab,9 c 1d9* )hvxwetravels 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 averagexb*c) e9iv h, ed9fw1a velocity?

  You are driving home on a weekend from school at 55 mi/h for 110 v 3kimr 5y40owmiles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and ork 0y3wvim4515 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is thehy. /7*v)q pkhzdngo 4 average speed of t pv .4oh)z yqnhk/*g7dhe motorist for this trip?

  A motorist travels for 3.0 h at 80 km/gb -fnle.c).s/ vt,lq6l t ;rjh and 2.0 h at 100 km/h. What is her aver, g/ttbj.sle 6f). -lrlqvn c;age speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 9v 1,*s aht56fjfbvedmi/h north for 750 miles. What i, f6f tv dshebav91j*5s the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 100tm0*gpa1 6 dl2k+sahcs4d9xa 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 tac 6hmsddx 0 a2t*+1k49apgslhe race, in order that the team A runner not lose the race?

  A car decelerates unikm9, 4z tes4bnformly and comes to a stop after 10 s. The car's average velocity during deceleration was 74 km/he4t , nm94zbsk. What was the car's deceleration while slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the average rate of m*u*fy2lywa*2lb es + .wg5ce ef ygsu2e 2. *a*ml5wy*cl wb+$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at ,wk ka9 pvvq.fv5l 80e zoix3(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 a-u: wz11rfjdn ccelerates 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 speed k4c5g 6 yqn*e0)xa r-cjq6xmes up with a constant acceleration 0 )crex- q6 y*nxga jc45mq6keof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 4.8 m/s experiences a conse-: ohdzjin oqp t)ud7-(*9r ltant acceleration ofzo)h*e 9dlod :7j tn- (piu-rq $4.9 \; m/s^2$. What is the cart's displacement during the first 9.7 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed o:n gn.vy0+avlm) amp8f 426 m/s strikes a sandbag and pe8pymavl) agvnn .0: m+netrates a distance of 57.16 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapul/ frh. *phy*in(jpl (vt on an aircraft carrier. It reaches a speed of 42 my*hnprfj. p*hi(l /v(/s at the 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 convyq/ javrny/h 7+v(rkb sz7 8.stant 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 distan0 1 (q5awce xq8 -iaw5ffio za.*j3dcoce of 200 m. What is its average acceleratia( xa*q8dii1 ofzo 0.f3 j5 c5qc-awweon?

  An object starts from reflw(um 8psx0y/ /o/cyst and undergoes uniform acceleration. During the first second it travels 2.2 m. How far will it travel during thl(pys//fw c/08o xmyue third second?

  An object is moving in a straight line wi7sd5dtwm u tax60;g)sth constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does i6d)5uxdt0g7sa ;wts mt move during this time?

  A car starts from resty9o,* kny6ffx and accelerates 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 qgo)-8:;jlxxzx-gx e on a dry 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, a car that hashi0 y*f z c6fa1ddqe,7 been waiting at the intersection starts 7qi06e aydh1,* zcfdfahead 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 1ikv;+k qo an;-r ed-/k2 m/s on the surface of planet X where the acceleration due -+e/kk ;io-vqd n;rka to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward wii*os:* d czn0xfc g96v7 wyxz.th a speed of 12 m/s on the surface of planet X where the 6fxicv*9dg0 z.sw: *7ocxznyacceleration 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/i oel51 d+pj-lxuz9(: zolon5s on the surface of planet X where the acceleration due to gra u5 51d zoi9o(xzpn: -ellj+lovity 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 surcqn0 tv36tam) t ul-1rface of planet X where the accele-l 1tv)6at3q 0 ucmrtnration due 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. If your friend holds a rulqlo,j2i 2(lex bsr l47er between your fingers and releases it without warning, how far can you expect the rulo(,li xr2l742qeslbj er to fall before you catch it?

  A ball is thrown upward at a velo*hp/jb 7soowsj:7) r mcity of 19.6 m/s. What is its velocity after 3.00po sbo:sjhj7r/*7) mw s?

  A bullet shot straight up returns to its starting point in 11 s. What is tha1vp 2/xqn7vs15r hsje initial speed ohv2jsav7s1/ 5x1pqn r f the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does i,sa1 / zywu z+sfp/pr q(ut/v7t take to return to its starting point/s p/tu/vzu fzs,qy p+7ar1w(?

  A ball is thrown downward from the top of a building with a6a 3q2yfg.rw /7tgmsc n initial speed of 27 m/s. It strikes the ground after 1.5 s. How high is/g7 t6.s fay3qcm2 grw the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numericavhuh5q+su9w pvs/ 5x *l value in the blps559qhu *sv + hxwv/uanks)
(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 0 w;yt9 gctqf.95e milspeed of 30.3 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 3 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 prze*ldy*pdmmt7o l xm(( 5s 9eln5/)the velocity at t = 1.0 s?

  In Fig. below, what is the velocity at e (vcuublj39 :t = 2.5 s?

  In Fig. below, what is the velocu/561bv8 in8guhgoad edz 8y 3r)v;x yity at t = 4.0 s?

  In Fig. below, what is the velocp.mbdc;ku-2 z- qq6smity at t = 5.5 s?

  In Fig. below, what is the average v2tc):seqlb)cl7* 08dlgl op celocity from 0 to 4.0 s?

  In Fig. below, what is the averagtgkr(,vdf 90 e5: *hlhcdp kl6e velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 10jjll1omre27 q+g tas?

  In Fig. below, what is the acceleration ag4 0fsd+z5rf 1thk.rst 3.0 s?

  In Fig. below, what ik2 gsk3 ofq-fegvo5.k x;lv 4-s the average acceleration from 0 to 5.0 s?

  In Fig. below, what is the averagwr:7x sbbfz* wjo+58 ue acceleration from 0 to 8.0 s?

  In Fig. below, what is the dis7)fzzflcs o o4y )ze80placement from 0 to 8.0 s?

Does a car speedometer measure speed, velocxf7+qg9*xv402czv zy ajp 1khity? {speed|velocity}

  An object can have a varying speed if its velocity is constab3:;aic0 xctra5h ,wxnt.

  The velocity of an object can be negative when its acceleraticlbq0 u 0r+uq2ss8us 0on is positive.

  If one object has a greater speed than a second object,dh n-* mum)-3qpzb )rgjxxu1 6 the first must have a greatem bguz--mnru ) qx*1x6jh3d p)r acceleration.

  Two cars emerge side by side from a tunnel.b il; ) oowq0-wj18ece 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 acc,nha a*1h3dkd mnz )s(eleration decreases.

  A baseball player hits a foul /j sx5l (* gnhzw) kza3r+iwo.ball straight up into the air. It leaves the bat withzi /g(aokz+sr5lw. wn )hx3 j* 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, (8qvqs +jf0no what is happening to its acceleration, how does it change if air frictis fvqn 0jo(q8+on is ignored?

  As a freely falling object speeds up, what is happening to its acceleration, how 2 p-v s4tsrqntt8(lz/4nr7fg does it change if air 4 n-(t tr tvf4gq2p7nz/srs l8friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original positio2 n(oc5,3 nej)rc iio9s+b ymkn with the same speed as it had initially if air resistance is negligib 9k 32,ny5+cc j(biemoi)osrn le. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzsl3oo,lg:cpou3uq z y 5g*u, 3ero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the same ,- z d10).nuxub ngpzitime.

  An elevator moving from the second floor to tp/wk7h dt 4d)uhe fifth floor making no stops along the way has zero acceleration hwpt )/ u4d7kdall the time.

  A rolling ball moves from(.vp* p b;m aey.nyhy2 $x_1=3.0 \mathrm{~cm}$ to $x_2=-5.0 \mathrm{~cm}$ during the time from $t_1=2.3 \mathrm{~s}$ to $t_2=5.7 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.2 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=3.7 \mathrm{~s}$ is at $x_2=8.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete l.gkinx ea+h* 9aps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.6 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 straikpu wqst5gg 96ut)( -;a,hfnbght line, moving 107 m away in 8.8 s. It thgk;6 hupuwf(9 )tbs t5n-agq,en turns abruptly and gallops halfway 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 frv b 9-u*yo cwb2an)bd,om $10 \; m/s$ to $23 \; m/s$ in 5.8 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 from 2u,d5 qcw )-yfg+kdrzmfw/t( $15 \; m/s$ to rest in a distance of 67 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a spelqqkt , u4yj(1ed of $28 \; m/s$ 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 can burst out of the b 6c0j6ad4jgd mwh9s+jl0gw*mlocks to essentially top speed aboutwsh+gjjg09 mc*l 60 dwmda6 j4 $11.0 \; m/s$ in the first 12.6 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 fromg4pv-rij /kw,hx me21 a speed of $16 \; m/s$ to rest in 4.21 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skiya;9 xbi* t)znd marks 92 m long on the highway. Assuming a deceler *xzna;9ibyt )ation of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck going*dkl4/ep d1a(r5igf o $25 \; m/s$ 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 10,000lrm 20vp 3cdxmc 7xl3- bfrs68-m run in less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then acceleraxpr83c2dc7r b x-lmlsfv360 m te at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$