Suppose that an obje kxr)j3pnx;l,wkwkl-92wn.y ct travels from one point in space to another. Make a comparison between the displacement and the distance t.nl;n9 j3kp,w-lwk2 ykrxx)wraveled.

  When is the average velocity*d :luy;d5ews of an object equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero to sixty wq )5u jnfq7g/in 8 s". This is a des5)wgq/ unfj 7qcription of

  An object moving in the +x axis experiences an acceleratii b3uvu;+w ri g*+-0s :qvxuoe19uwivon of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East x+khqj:a zpg 0f-udm6 :mx/s+ (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration0p-h u+xmg:zs: x jkfa m/+qd6.

  Suppose that a car travel6 /um,qxw2 1pr zyjtl+ing to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statemuwl +p1 2rzt,yjxm6q /ent concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a sg5n5h2ti*jq (:oznb2s f an w7tatement concerning in (zowqt5j* 2 gahns:n752bf its acceleration.

  If the velocity of an object is zero, v3qar1wqh6y( x )4vdddoes it mean that the acceleration is zero? Suprhdw4 36 q (avx1)dqvyport your answer with an example.

  Can an object's velocity change dirbz /kzazzw ap4)-ju5: ection when its acceleration is constant? Support your answer with an example p)jkz z5-w:a/z4az bu.

  Suppose that an object is moving with constant acceleration. Make .n+/jj:9r d rbnvn(c la statement concerning its motion with respecjc(nn+bn9v/:.jl drrt to time.

  Can an object have increasing speed while its acceleration is dec;j eg7obj c)io1 f0y6cko3 t7vreasing? Support your answer wck60 jij g3boey7oovc;tf 17)ith an example.

  Suppose a can, after an initial kick/2 d4 iamk:e,ihgy-nr, moves up along a smooth hill of ice. Make a sta:4,-kre gi/nyih adm2tement concerning its acceleration.

  Under what condition is average velocity equal to the av3r sk66azurh7xzv/( berage of the object's initial and z37(buzk 6ra/vxh s r6final velocity?

  Objects A and B both s x95d z.z6zztptart at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of pz 5t69z. dzzxobject B?

  Objects A and B both start from rest. T6wj:r-rhgi4 2o)tp/ +ohs l cbhey both accelerate at the same rate. However, object A accelerates for twice the time as object B. What ig -hh26jlws) c4rr tp:/boo i+s the distance traveled by object A compared to that of object B?

  When an object is released from rest anr zx4u)(,szt nd falls in the absence of friction, which of the following is tru,n(z)xtur s4z e concerning its motion?

  When an object is released from rest and fac96bc5 qvzz /otpq16a lls in the absence of friction, which of the following is trz qa6zcotq 6pv95/1cb ue concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the ve1or+i t kt0gy*,4 axcelocity and the acceleration when the ball reac 10oegk ct+a4,xiyr*t hes the highest point.

  Suppose a ball is thrown straight up. Wha71 )l cr6cc ufmsvd7+et is its acceleration just before it reaches its h7fcmd+ c6r) 71cuvselighest point?

  Suppose a ball is thrown straight up, reaches a maximu2g-igt/8ghgya.0 ioe m height, then falls to its initial height. Make a i hg gge.oi2 0yg/-ta8statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a 35t hf fm),a-yisys.ldl :9 vcmaximum height, then falls to its initial height. Make a statement about the direction of the f)ll d :,fv.-5 yahcs t9imy3svelocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance+is t5b9kzg ym tcrv:.mgw78 6. Make a statement concerning ikri5tg+ w7mbsc86: t yzv9m.gts acceleration.

  Suppose a skydiver jumps from sk so23skw) :hlr0m )qoqq6k3 6t prp5a high-flying plane. What is her acceleration when she she reacheso5r)q 6tk:p)33skk hwsp m r06olq2qs terminal velocity?

  A ball is thrown vertically upward witlx)iu09hrdglgm .8fg322vse h a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height m uvglh8f)2xs09 ggdl2r .ei3 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 bui p3qg p 8ch/0zl2xqg8m( 5cbjblding. One second later, ball B is dropped from the same bui2pq(/g g 5 lbhx8cj0qzbcmp8 3lding. As time progresses, the distance between them

  Ball A is dropped from the top of a buildinxihvs ,3) nuti 0tme12g. One second later, ball B is dropped from the same building. As time progresses, the diffe i3timvs )02hu,xetn1rence in their speeds

  Two objects are thrown from the top of a wu 4lxo o6e6wu-x,f6ktall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their spk 6xu o4-xuwe6o,6wfleeds when they hit the street?

  A brick is dropped from the top of a building. A second brick is thrown straightpu,yag8e3p5.x mjyp6z- a k2x down from payp2j6k x, 5a.pzm-y ux3ge 8the 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 theh y*dyi. tbz)c b/i6b8 +x axis. The position versus time graph of8 .ztbcy/ibybh 6 di*) this object is

  An object is moving with con nbi*2xcmw tzu/tiw+1 .(b yec lqh778stant non-zero acceleration in the +x axis. The position versus time graph o(z7i 8by1/+ tu*lxqenwcmwi. th2c b7 f this object is

  An object is moving with constant non-zero veloccai.,h4mud ,l f6va9s nq s,p8lz:g1dity in the +x axis. The velocity ve8,l:4 l. uanf 9gisa6dmdh1zvpsq,, c rsus time graph of this object is

  An object is moving with constant nmut;8 rz*q, lion-zero acceleration in the +x axis. The velocity versus time qzrimt *; 8,lugraph of this object is

  The slope of a position versus time graph give-0, she krftx2d6b* aos

  The slope of a velocity versus time graph gives+4v ang2nzdbx0bqn92+q xcm b/+qx(u

  The area under a curve in an acceleration3* xvpuo4dco 6 versus time graph gives

  The area under a curve in a velocity i tlyigz jd(h;6)9z0 bversus time graph gives

  If the position versus time graph of an object is a horiz:fi+t,o+,xi egpwf :u ontal line, the object ifo ,,tw+p exui:+g:fis

  If the position versus time graph of an object is a vertical line, the +s m)n x,b1-0,4xadpux s2a;qlhpf ro object isr+1ma0 sb)l,2;xfps u 4npdxa q,hx-o

  If the velocity versus time graph ofs 6 ;tup1q5 u1fotuz:e an object is a horizontal line, the object is:q ut z151outu ;ef6sp

  If the velocity versus time graph of an object is a straight line malw+n2y9p 7jhh(dj, tftx+ h,a king an angle of 30 degrees with the time axis, the objehtjh2ln9,(7pdxw t+j y+a,f h ct is

  An object moves 15.0 m north and then 11.0 m south.smk/.6)jahnm 3f q3)lw2zgc pq / f:qu Find both the distance traveled and the ma mswugfm3 / cjpq./a)l3fz):nh6q kq2gnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to */ft zge/i;z;c*b u 7 x0rsheamove 12 km upstream in a river flowing 6.0 c eae*7r * zbz//0tsfxih;;g ukm/h?

  55 mi/h is how many m/s? (1 mi = o w uef4kh(cfq8 ./sd)6b 0etu1609 m)

  What must be your average speed in order to trag1z(eix6+rfme3 n bu4vel 350 km in 5.15 h?

  A runner ran the marathon (approxima)wi. qv)wd g-ztely 42.0 km) in 2 hours and 57 min. What is the average sp wq)).gwd i-zveed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it p 4vbh6de)o k0 ,t7isvto travel 400 km?

  A ly (light year) is the distance that light travels in one year. Txz55g.9bd- zzlkyde )he speed of d)elg.byd-z5z k9 z 5xlight 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 r7kuioddh86nj x s6 -8ilm(rx.oad and you look to the side for 4.0 s, how far do you travel during this inattentive period?r jl7xo. (ku8mdisxnhi8-66 d

  If you run a complete loop around aa(yr xs/whtywn(n3;ew ,w98vn outdoor track (400 m), in 100 s, your average veloh (wns9etw(8 ;v /3wnyw,yr xacity is

  A polar bear starts at the North Poh:zj.d ( ee(oc36qbvdle. 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 6vjbo(dd.3 qe(zh e:c starting point. This trip takes 45 min. What was the bear's average speed?

  A polar bear starts at .h y4-(cce8holak j+ nkz ,gv9the 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 min. What was the bear's average, j4+8 (yoa lg.vkhczk 9chne- velocity?

  You are driving home on a weekend from smby,o- ,xfju- chool at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arri ,fx,jy- obmu-ve home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 1609 7ow/h,3p)g p(itsoy 0ynfis km at 80 km/h and 160 km at 100 km/h. What is the average o 0nhw sf) /i3ypgps9 i(7,toyspeed 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.u0ae n; wsr,at.4.osb What is her average s .;0asw,r.4obat unse peed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then atrx+gn-j3n * sbdn2 dz-yqz65k 250 mi/h north for 750 miles. ny nrkg-x2 zdzd5b*sn 63qj+-What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the last 10pl:k 763 nfrhz0 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 runfh:rp67nzlk 3ner not lose the race?

  A car decelerates uniformly and comes to a stop after 10 s. The car'sw 5hj5k vd/:5 ,0veh(xaild jw average velocity during deceleration was 76 km/h. What was the car's de,j (k wd5jl whe55adi v:0hx/vceleration while slowing down?

  An airplane increases itc .onb2ox9z) omb,s 0xs speed from 100 m/s to 160 m/s, at the average rate of z,b c09) xmono.2boxs $15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate oz r;rju-)5nwt(m 1w5 marvw1bf $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and accelerates at (3kaemnjzw,( $4.0 \; m/s^2$ 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 3oj/fg pp 0hyuv) 30mv10 s. It then speeds up with a constant acceleration f o3u0 phgym0p3vjv)/of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 4.5 m/s experiences a constant acceler 1k0*ga;(ytf )oyuou0u.r cjnation or .c;guouf0y ay ) tk1n*(ouj0f $1.8 \; m/s^2$. What is the cart's displacement during the first 5.6 s of its motion?

  A bullet moving horizontally to the right (+x direction-75)cvh .hq emu6x pp5 gm+,y/ty tigs) with a speed of 383 m/s strikes a sandbag and penetrates a distance of 57.86 cm. What is the average accelerate s -657hyt yv.5xihq/)mmg,c+gtpupion, in $m/s^2$, of the bullet?

  A jet fighter plane id-yq) 9 ) dpq )s(j(mham*2auzr/rc nzs launched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is z-r))urd/mj9ca)2 (nq pasy * hd z(qmthe length of the catapult?

  A car starting from rest moves with constant acceleratik)o- xjy)sh*t:hzcd, bw zl))on 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 ,g+9 ;ctxsfyhwj7a3. +7co samrw*vc its average acceleratio+h aw * y,vsr+x 9ts7.m3ow7fgccca;jn?

  An object starts from rest and undergoes unif3cqmyyh64.fx uz5hk94 jttc4 orm acceleration. During the first second it travels 8.6 m. How far will it travel during the third ttc34y59fc4km46.xy hqhz j u second?

  An object is moving in a straight line with constant acceya ,z8hn.bu0 0+uryglleration. Initially it is traveling auy gr,a.0znh l 0+b8uyt 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates unifonlsvqqa ,v2n8f;arfafg, ml //(d 83t rmly 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 at aboutf2y 8rcfvq 6 .x;j)iez $5.0 \; m/s^2$ 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 ;d1r9rtdi .fycar that has been waiting at the intersection starts ahead with a;rr1dd y fi9.t 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 upwa/pv haa j-b7s8rd with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity 7 /b-8hpaavs jis $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of 12 m2)rimw- xcr bn) n(0be/s on the surface of planet X where the accelerem-wric( b) n)2bn0r xation 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 m5uo 5j7 :x(va(c k w.wee xmox)io6d*a/s on the surface of planet X wherwmx(u576o.xxiwv 5aee*( c)oo jka:de 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 the surface of pla0 n0:o upglv1anet X where the accelergun0 1po0avl: ation 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 g9 pk782jeghi )a p*iqvreater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect g kih2 eiv8pqpa j*7)9the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 1wv;.y dp05luw8 i :*jp kx9ihb9.6 m/s. What is its velocity after 3.v 5h0jxwb wkp9 pdi*y8i:;.ul00 s?

  A bullet shot straight up returns to its starting point in 9 s. What il c1/oigc 9;xyytqm -i gp**e4s the initial speed of ytyi14p m;o c*igqg /9-ecl*x the bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does iaj h(vkbc pjo5:cs6:t7rcl)( t take to return to its 5cpt:7 hv)ckjlcj:6( sora (bstarting point?

  A ball is thrown downwarxiro2+3 di1y 7bawsa 5d from the top of a building with an initial speed of 7 m/s. It strikes the ground after 2i adrob+1ws x53yai76.4 s. How high is the building?

  A ball is thrown straight up with ei.*0 8 l ncxs;2i0zspzlfwm 6 c)sptu b8j4o/a speed of 30 m/s. (only fill in numerical value ibp0z0ec)sfu/ *mi8ns; ij z4.lsc6lo2wt8pxn 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 wf:jnd 6l9,t3c54zjl z,abd vuith a speed 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 2 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 13 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 13.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = zc14(r zttauzwc.d 3u4 edq *+1.0 s?

  In Fig. below, what isd.rzm.r 4)zt b the velocity at t = 2.5 s?

  In Fig. below, what is the velocity aeef61) bq9gwnt t = 4.0 s?

  In Fig. below, what is the velocity at9*cgw,jv n6jo t = 5.5 s?

  In Fig. below, what is the averagzvi b/q cr8dq,w *0lb1e velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 tos3ojxcx;g +v, 6.0 s?

  In Fig. below, what is the accelera+)ulk hm3b,tw tion at 1.0 s?

  In Fig. below, what is the acceleraw -m,aw6 v2zel)r 5ndipv 8+rktion at 3.0 s?

  In Fig. below, what is the ave,clf 5;b 2i win:y;ksmrage acceleration from 0 to 5.0 s?

  In Fig. below, what is the average accelgcaw1z2e1ru wj 8ld5f6;2b pperation from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 tc ,; /usvxiafbxx4 b25o 8.0 s?

Does a car speedometer measure speed, velocity? {speed|velocity ugw/eek kc75--w/nnm}

  An object can have a varying speed if / ih6a,h5fppa/3mlmfits velocity is constant.

  The velocity of an object cafob afk /8ha,4n be negative when its acceleration is positive.

  If one object has a greater speed than rq ykrwbp ehz.:w4*.2 a second object, the first must have a grekehy4*p r.2zwr b:qw. ater acceleration.

  Two cars emerge sideb . (o wou;px 0:ai)m*wbrk4pn 6c/rvi by side 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 decre)- )0, n2ntjerk3hcgscf8mj f ases.

  A baseball player hits a foul ball straight up into the air. It leaves the bat wwqk+ idbx)w8b0p6; qcqluf9 7ith a speed of8)7 9bw 6 k0l;q wcqdbxpi+quf $120 \; km/h$. 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 happenin2r8w g qk(p-v.gtq8nng to its acceleration, how does it chavg p8-gnqwk (.trq2n8 nge if air friction is ignored?

  As a freely falling object speeds up, what is happening to its acceleratb w xkz,n 6f;j.fa-e9lion, how does it change if air e j;kx-,a f. 9fwblnz6friction CAN NOT be ignored?

  An object that is thrown verticallyu3qk 7*q5ovsu upward will return to its original position wi7v35 su q*kouqth the same speed 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 velorwpi:wmd bs/8-tz k20 r:dkb/city and nonzero acceleration at the same time.

  An object can have nonzero velocity and zero acceleration at the same time.0qs xkyv*/8vdni ,e e5ubcc ;3

  An elevator moving from the second floor to the fifth floor making no sskh4 vgorf (o 2nv*s,3tops along the way has zero avh2no frsg 4,ko( s3v*cceleration all the time.

  A rolling ball moves from :1jn g;xc/ wm2rymg;v $x_1=2.6 \mathrm{~cm}$ to $x_2=-6.3 \mathrm{~cm}$ during the time from $t_1=1.0 \mathrm{~s}$ to $t_2=5.1 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.9 \mathrm{~s}$ is at $x_1=2.4 \mathrm{~cm}$ and at $t_2=4.1 \mathrm{~s}$ is at $x_2=8.0 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight cokjw4mzned ;. *abtr; ;bp4) qhmplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.9 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 1 /wq a3k.+yltof 4kmk;3s+ gfo01 m away in 9.9 s. It then turns abrupt qg wla3.;tofk+mo y3/+f4kskly and gallops 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. msad jl1m)8hom $12 \; m/s$ 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 fromy2 o1 2dqc3qo qmkcrl,f;wz 7/.-qddc $16 \; m/s$ to rest in a distance of 79 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reac8o57kib n r;ceh a speed of $29 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks wyq8o7 i6-krjw9ynb th*, (yoto essentially top speed about wjw htb9nyy6-rk 8 qyi*7o o,($10.3 \; m/s$ in the first 12.4 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 of vus*abpv8+ :4q/ iitv$16 \; m/s$ to rest in 5.78 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid marks 92 m h.:/e bwke;q olong on the highway. Assuming a decw k.heqeob: ;/eleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truua;y8p4)fogh6ynvj 6 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 the 10,000-m run in lesu:6wbjbyio, /s than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then aw :ioj6,/yb ubccelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$