Suppose that an object travels from one point in sa -p4dvi96liay+4b h lpace to another. Make a comparison between the displacement and the4pahl- iyd46vlb i +9a distance traveled.

  When is the average velocitb m*h z rs/4qk30;do3e2gid vny of an object equal to the instantaneous velocity?

  A new car manufacturer advertisefo b7a+3sc8 /nl x1f6/ sjplcaz/k saev18ci)s that their car can go "from zero to sixty in 8 s". This is zvk a1/1xb+73 6o/i8acclsl/s ec8s afj)fnp a description of

  An object moving in the +xqc )l(m u .orazrlayvj-1h, kj0+)e; o axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car travelvraom j u24s71ing to the East (+x direction) begins to slow down as it approajr1a7 4vmo2 suches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x directi9ia0r. cn scj5on) begins to slow down as it approaches a traffic light. Make a statement con a5n.crs9ji0 ccerning its acceleration.

  Suppose that an object gf-l;4dap (5dk zbg.ais moving with a constant velocity. Make a statement concerning i ;fgld54 kazb-d.( gpats acceleration.

  If the velocity of an object is zero, does it mean that the acceleeyj6nv;n 8ge8 hfx-f.ration is zero? Support your answer j ;xvg8f8.ennfeyh-6 with an example.

  Can an object's velocity change direction when its acceleration is consta6)em.:ffno:w2c pgz5f k 3vo2 ngew4u nt? Support your answer with an exam wn:2n2c) 6gukf:fmfvo ee gw45op3.zple.

  Suppose that an object is moving with constant accelev +qd(tu w+sj7ration. Make a statement concerning i(tv +dj+uw7 sqts motion with respect to time.

  Can an object have increasingx u yhpkuxgj9ld:mb/t, b8 b.1 pk584l speed while its acceleration is decreasing? Support your answer with an example.d8kb ,u buj4yh.x5m:ltk/g8p 9l1xb p

  Suppose a can, after an initial kick, mov;w4k fv.j5/wwe 8mjynes up along a smooth hill of ice. Make a statej5y wj/we ;84wfkvm n.ment concerning its acceleration.

  Under what condition is average velocity equal to thed 4gnk8fg u 689v:datv average of the object's initial and fi9ku88a 6:fgdv4ndt g vnal velocity?

  Objects A and B both start at rest. They both accelerate at:re04 p ) (f/-o)progmm+igf1aualfz the same rate. However, -z)fa4 p alufo)/reg 0m r:i1+go(pmfobject 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 accelerate at the sa vhj9 o a7ajrldiv5k/ng3i) z/1eg. 4zme rate. However, object A accelerates for twice the time as object B. What is the distance traveled by ojgga59ide/zv n jkv.oai lh7r4 31z/)bject A compared to that of object B?

  When an object is released from rest and falls in the absence ofhz5 05s-n;:zi lijcm u j+iz3pvs6fa* friction, which of the following is true conc5z-ujsl60jzi+s5in ;p fcah m3i v: *zerning its motion?

  When an object is released from rest and falls in tr uat0j;j;c-o he absence of friction, which of the following is trujtcjo0a- r;u ;e concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about thegm;gr3y v. ex mh m)oqi88*/th velocity and the acceleration when the ball reaches the hih83 e/gy;.mh i8mr )*gvmotxqghest point.

  Suppose a ball is thrown straight up. What is its ac zy-:nv()xy wzceleration just before it reaches it:w(yv)zz -ny xs highest point?

  Suppose a ball is thrown strac;v;c,ufh uyvkd(my 3 x-irdj 1 :,e.sight up, reaches a maximum height, then falls to its initial height. Make a strkcied- vf;;cyv (hm:3u,u.y , jx1ds atement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximux;vcyw0ob0+ 44oeb b zm height, then falls to its initial height. Make a statement about the directixy+ ;vbebo 04o4cw0z bon of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence ft yq d k*zm2bwf+,yx2 oq8s0+of air resistance. Make a stateme0m+2 *ftfz qyksobxd8+qy ,w 2nt concerning its acceleration.

  Suppose a skydiver jumps from a high-flying plane. Wha9) w1t s5dr .qrurs(ift is her acceleration when she she reaches termind(ufrwsqr9.t sr1) i5al velocity?

  A ball is thrown vertically upward with a speed v. An identic /dw (x*snfkx+al second ball is thrown upward with a speed 2/+k xn(wd*xsf v (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 ball?)

  Ball A is dropped from the top of a building. One second later, ball B is deqqwa+.5g:f e ropped from the same building. awfee +g .:5qqAs time progresses, the distance between them

  Ball A is dropped from the top of a builci1:ba u5/ 6j3a oisdeding. One second later, ball B is dropped from the same building. As timjaes:6oi31ac ui /5b de progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is throwni8w,1*6m8arp/u p(pe wo4gew 0 y ejxf up, and the other is thrown down, both with the sampwe8i61*/w4 ,e a(gu8 fep yr owxmjp0e initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of bi6hax:u(ko wswrw9 n+m,g-. a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.o6su9ag(r wi-m.: n b+,hwwkx

  An object is moving wi)h uzy5w 1kp9r nu qgjl1)1d,rth constant non-zero velocity in the +x axis. The position vershpj1 r,w k yqz9n)ug5u)1d1l rus time graph of this object is

  An object is moving with constajsp,yxy8:9 be2l5wgq nt non-zero acceleration in the +x axis. The position versus time grap9yslb ej gwyx,q85:p2h of this object is

  An object is moving with constant non-zero velocity in the +x axis. Tvd omqdy:7m13 he velocity versus time grapmd:7o 3dm qvy1h of this object is

  An object is moving with constant non-zeroj.9cq7 mcnu+ rsa v-t2r3*faq acceleration in the +x axis. The velocity versus time graph of r93suqacn.mv- ta 7*cqrfj2+ this object is

  The slope of a position versus timeq 7vhnd7 d3v5h graph gives

  The slope of a velocity versus time grat7+ad um6.b.drr - l4 ogimc-bph gives

  The area under a curve in an acceleration versus time graph gives8m s)ez.vh 7ae

  The area under a curve in a velocity versus time graph qjh y;- +ntwvj +:tyz2gives

  If the position versuffatp9om vej( l u /qt bw-c:n8n1/ z:1;wmur2s time graph of an object is a horizontal line, the object ifzwctw: (/ja1unp;:-r nb mu1eq fom v8lt2/9s

  If the position versus time graph of an object is a verticqcqnpgkh5ag) l;x kcq, (+8x(al line, the object is q(+a x)85k;kph gx cclqgn(,q

  If the velocity versus time graph of an object is a horizontal line, r a/ze6sbd 3(+i+*zro0o dpcwthe object (*0idwz d+ oepr+bzo6 / as3cris

  If the velocity versus time graph of an object is a stray av;l(jj u*gv7q;,i iight line making an angle of 30 degrees with the time axis, the object i j(*; yjlvqiguv, 7a;is

  An object moves 15.0 m north and then 11.0 m south. Find bz sgdr/i1()ckoth the distance traveled and the magnitude of the displacement vector.i zd)1sc/ (krg

  A boat can move at 30 km/h in still o6 :q xb6qr.y7h9qgs s.w+dzhwater. How long will it take to move 12 km upstrsw6q.hoqy zgd hb7.9:x6+ sqream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 16n rl,/+ mkn*s 4 6.vtnf*ndtqv09 m)

  What must be your average speed in ord gv1wn+ xe/ kxisb4)zt.ymswzd:7 6-jer to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 mr8r mgk(/ h:fs aw.04vj sdrm(in. What is the av4h.v:r8sr0 rgsj/(( ka df wmmerage speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it to 7b;,wm9h8 czfu4s hnhtravel 400 km?

  A ly (light year) is the distance that goo zq:+0uie8 light travels in one year. The speed of li uiq+e08go:zoght 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 lo87f-y 7uuph jk/rkq9pok to the side for 4.0 s, how far do you travel during this inattentivuf7 / 8kqj9pyu-k h7rpe period?

  If you run a complete loop around an yt6prb280 p sro b,v8noutdoor track (400 m), in 100 s, your average velocity i8o 0pbntr2 vp6sy r,b8s

  A polar bear starts at the North Pole. It travels 1.0 km souf6 wo1hdohz85: h s gq1hgq6e2th, then 1.0 km east, then 1.0 km north, then 1.0 k e h6q ohs 1gzfq5g62h8ho1w:dm 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. It travels 1.0 km south, then 1.0 km0 jw*qr .h9hyd 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 ave *h0h qyr.9wjdrage velocity?

  You are driving home on a weekend from school at 55 mi/-/w09 7n fzdro9 wjxqqh for 110 miles. It then starts to snow and you slow to xoqq09nw/z 9r-wd7f j35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160 km at 80 km/h (2h8af aok/ 42w;knkek ds. mhand 160 km at 100 km/h. What is the average speed 2hhkm.8kek ad42nfka ;/( wosof the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her ave83jmzq+zscy/ f r u7j7rage speed for the 7j8cz jruz fq7m/+ ys3trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mov00odgzp 9 v6i/h north for 750 miles. What is the averagp960od0vozvg e speed for the trip?

  In a 400-m relay race the anchorman (the per) wyby g):ppe+son 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 runner not losee +)g:yywbpp ) the race?

  A car decelerates uniformly and comes to a stop aftep um*p9o0;mp p:tfwb*r 11 s. The car's average velocity during deceleration was 39 km/h. What was the car's deceleration wht*pof ;b*m mpw0:pu p9ile slowing down?

  An airplane increases its speed from 100 m/s to 160 m/s, at the gzu*og4rx7qd 8ny0p5 average rate of 4ur 8 7yg5zq*pxg0nod$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerc sym-ek3 e9m+olz-u1ates 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 res8 t /niqmw /jt51xev(*mxvzl/t 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 witjjz*iv +w3kf,e1yj e v4gq9s*h a constant acceleratiojyv+g*vje9* ,e13 w skqjifz4n 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 7.2 m/s xg07qopa.*: oadwi /u b)hve7l z(a+dexperiences a constant acceleration ofl 7gb(dv0o/. a+7 p ozw)h uda:e*qixa $3.0 \; m/s^2$. What is the cart's displacement during the first 5.7 s of its motion?

  A bullet moving horizo2rl nfk7ks73nmszp- /ntally to the right (+x direction) with a speed of 307 m/s strrlk7/n-nsz7 pmk sf23ikes a sandbag and penetrates a distance of 90.74 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on adgw2ici/.bmhrj -u c( (8zk 62f+fexln 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, whatcm2i(-f 6rb8k/2ihuw gxd. +cj(e z lf is the length of the catapult?

  A car starting from rest mov3rw3uh5t42g 3 oeokf yes 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. j6mzi lq a :r;68qgsg0What is its average accelr:;z q68msila0jqg g 6eration?

  An object starts from rest and unnqh u)xx946i7 q6d/ gvqwl:sndergoes uniform acceleration. During the first second it travels 8.0 m. How far will it w6/s4qg dxq7) :q96hulnv nxitravel during the third second?

  An object is moving in a straight line with constant acceleration*uxmb0( fy1im*6noa exclw5 nay 0:l8. Initially it is traveling at 16 m/s. x 1ey w a*86c0mmiybnf uaox(5nl*:0l 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 un 5thx rt7* r+uj)v kvg14l./d)cugwl biformly 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+u4 * ecs x(f4)vfazkw 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 turnsxhr+/ctp h+bu:)q7- hl*cz bjrtx62z green, a car that has been waiting at the intersection starts ahe+z)+tbrrjucq xc :-th*xp2hzlbh 76 /ad 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 m/s on the surface of plao xon*nndqt:4c- (,66 x0pxyjp v1xsm net X where the acceleratiox6spnxvx016ox-d j nm:o( n4q yp,c*tn due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward withd6 rp*wrhtd0- a speed of 12 m/s on the surface of planet X where the acceleration due to gravi p6*r t0hd-rwdty 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/s on the surface o3tz+qv 9s4jjajm6ib /l2vk e:4h4g ztf planet X where the tbv44ajzkgv49jmljs /t+i3z : he6 q2acceleration 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 suex9wodbt. 7+l 5pw4 awrface of planet X where the acceleration due to w4l75a+ex9ww td.pb o 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 axq9)m: df,gbf 8fs3ez ruler between your fingers and releases it witho: mesf ,zxf9 b3)dfgq8ut warning, how 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 aftergz, qpxj e ..u/w7i,hn 3.00 s?njh/pie ,ugq 7z.x.,w

  A bullet shot straigh..ve7,kn0 sb g.w )6xfigczpr t up returns to its starting point in 19 s. What is the inx)b n7f.6 kw egpv0.,crsgiz.itial speed of the bullet?

  A ball is thrown stra ; .2: gjiiub+gvloe w6bhz9*sir:ig/ ight up with a speed of 36.0 m/s. How long does it take to return to its starting poi:obgisli;je*hwbrz g. /+ivgu 9:26int?

  A ball is thrown downovg2-q2b5;j y ga(djq .l3jwwward from the top of a building with an initial speed of 12 m/ b3w5qa2q w-lygjj v.j(2;gdos. It strikes the ground after 7.3 s. How high is the building?

  A ball is thrown straigb5etpd3 +o dvg b*k+c xu5v*-qht up with a speed of 30 m/s. (only fill in numerical value in the blanks) k ce*bd3xt++pou*5 b5vdg-qv
(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 intoqi c wa5(thhj;k 83e5q the air with a speed of 48.2 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 14 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 14.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = ma,iqfugk uq)4nw.3a, cg3t , 1.0 s?

  In Fig. below, what is the velocitlb3jg mi( fg- c;(r8thy at t = 2.5 s?

  In Fig. below, what is the velocity atp,9b qbf.x hoo*j7 -kpia w;s- t = 4.0 s?

  In Fig. below, what is the velo7uru+3 pdn3aljzvu * .city at t = 5.5 s?

  In Fig. below, what is the averageuack/t5g05 y e velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity vb50y zhe(bjqq/:*9 c 5q0q 1xeh ogsihh( hn-from 0 to 6.0 s?

  In Fig. below, what is the acceleration qqyt ,9siun73at 1.0 s?

  In Fig. below, what is 3jj2 gj4 0rqjothe acceleration at 3.0 s?

  In Fig. below, what is the average aw e8k g,uh9w)vcceleration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to fr, t z0m7qsy88.0 s?

  In Fig. below, what is the displacementba+clbsjp)8e4 3vp f;uc( 9us from 0 to 8.0 s?

Does a car speedometer measure speed, vejyhiz-3wd, 1r locity? {speed|velocity}

  An object can have a varying speed if its velocity is constano-a(il :h ae h:0d8cylt.

  The velocity of an object can be:k 3oo e215kqdjwk7d e negative when its acceleration is positive.

  If one object has a greateqn, sx3fk/+ wzyu-0 yxr speed than a second object, the first must have a greater acceleratnqu wzx/-,3k0+syfx yion.

  Two cars emerge side by side+b8m . rgc7s 10ii *vkni 3wxeyqxlmmx3v2z6/ 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 d-lk, .bf,kw -jg2qnt 1-w ertyecreases.

  A baseball player hits a foul ball straight pq7d6cy: i-affzs 8 /eup into the air. It leaves the bat with a speed of6y/:cq7aseipd8- f zf $120 \; km/h$. 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 happening to itsu qbywmyk .2 zcsn2oi78l73y+ acceleration, how does it change if air friction ii2mnu.87ql327y bswockyz y+ s ignored?

  As a freely falling object speeds up, what is happening tpi7g) h9laeyoa2+h5im )sw (l o its acceleration, how does it change if air)w7y5s )m ilgl2hhea9i o+(ap friction CAN NOT be ignored?

  An object that is throwh 6zrzz +galy1u)z4*bn vertically upward will return to its original position with the same speed as it had initially if air resisbzzgy 4z+z *)6lharu1tance is negligible. If air resistance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration tt 3z*j0cl rx*0f3dxdz+uw i,at the same time.

  An object can have nonzero velocity and zero acceleration atkb/ )jbln2 kh9v1g flj9i )y1h the same time.

  An elevator moving from the second floor to the fifth floor making no stops alon - b.jgs8fw3bdm-y x4zg the way has zero acceleration all the jgwxmd 48s.bb3 fy --ztime.

  A rolling ball movesh 67et-g i)i(vv 6ah9ux*d4j tihbb2 i from $x_1=2.3 \mathrm{~cm}$ to $x_2=-4.5 \mathrm{~cm}$ during the time from $t_1=2.7 \mathrm{~s}$ to $t_2=5.4 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-2.6 \mathrm{~s}$ is at $x_1=3.1 \mathrm{~cm}$ and at $t_2=4.1 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete lape6h:fli ;vj0t s around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.6 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away frbk7ri4 f9 vaap/eq w;3 vhngw*9a( q(nom its trainer in a straight line, moving 102 m away in 12.5 s. It then turns abruptly and gallops halfway back in 4.5 s. Calculate (a) it( ifpwvnqawan(rq* ;7b9a/ke4 v9hg3s 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(3)l 8+ ;f;rc qmv kqlrw:qezeom $11 \; m/s$ to $25 \; m/s$ 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 from rw33oziotgw w1:r 2lgc6n1 ;c$17 \; m/s$ to rest in a distance of 71 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reachqlkscpawn4 w /efq2 *)4 t6nn9 a speed of $32 \; m/s$ 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 bv.s3thapm9 )y 23emd6x-vapr locks to essentially top speed aboux ) pm6rv-h9ea mvt2s.ayd p33t $11.5 \; m/s$ in the first 14.5 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 fro*gylrxcka x;f:e cm(n+i i,jt 10 6lf0pn sp*2m a speed of $16 \; m/s$ to rest in 4.03 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid mareg1 v,3cz rjs0ks 92 m long on the highway. Assuming a decele3c0e, rj gvsz1ration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tr) l59 7puayzxa+2xef hi9zdw,uck 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).    $m$