Suppose that an object travels from einpi( v)33n )v2fqx 86cimhuone point in space to another. Make a compa3p(u)e fhin)cx 2i83 qm v6nvirison between the displacement and the distance traveled.

  When is the average velocity of an object equal to th*mq)w oo+8ky je instantaneous velocity?

  A new car manufacturer ilsqt :7*i6 aiadvertises that their car can go "from zero to sixty in 8 s". This is : sqi76a*tliia description of

  An object moving in the +x axis ez htp8m nw;i( k 1sb/p2f;-nymxperiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direct*15pv 80(khyxa jcgaure:jj( ion) begins to slow down as it approaches a traffic light. Make a statement conccua:8yavjjrg(kex1 jh*0 (p5erning its acceleration.

  Suppose that a car traveling to the 1vj3tsve:cs 2 West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its ac 3:escjsvt1 v2celeration.

  Suppose that an object is m jxn m,+6l lvkk,j/ elaq/fn6j b5.o9toving with a constant velocity. Make a statement concerning its acceleration./j /+xeklnl fq,.vtnm 9j,6oba6j5k l

  If the velocity of an object is zero, does it mean that the aivy18g1/:bnrztz 2 o )v*ixxrcceleration is zero? Support your an)inbxoy 2*xt1 /:zgvvir r 8z1swer with an example.

  Can an object's velocity change direction when its acceleratioi,doq5, n 0mj )+prnvrn is constant? Support your answer with an exampv5)oq,r 0irnmp,+jd nle.

  Suppose that an object is moving with constant a :3/qt ;,y-1dd stpcjeqz-pbccceleration. Make a statement concerning its motion with respect to timebcs,t / d -3t-djqz qpp;:ey1c.

  Can an object have increasing speed while its acceleration is decreasing.v8k edpeh,nl 5u,b. u? Support your v,e e8bpu5kdu,h.nl .answer with an example.

  Suppose a can, after an initial kick, moves up alo08jv vwo0/xchz,/yq nng a smooth hill of ice. Make a statement vv/ yhqco,n zxwj80 0/concerning its acceleration.

  Under what condition is average velocity equal to the averddk.)ou1kv8 ;982ds c4p ;cur msevscage of the object's initial and finad; dcvd49;m.ueu sk82p k8)c1 scovrs l velocity?

  Objects A and B both s iau0x 5vh0pcei9 mv9(tart at rest. They both accelerate at the same rate. However, object A accelerat9u5x v(9peicavm0i0h es 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 2+bros6lrmiwu -5 b5n5ehfq6 start from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled byhbsrwl56o emf5 - 5u2bqri6+n object A compared to that of object B?

  When an object is released from rest and s3 tna)doqn-.falls in the absence of friction, which of the following is true concernin ntq -.on3sa)dg its motion?

  When an object is released from 0rp8 dt;lh nw)rest and falls in the absence of friction, which of pnlrd )th80 ;wthe following is true concerning its motion?

  Suppose a ball is thrown straightn na3r/1qc0u o:+myat up. Make a statement about the velocity and the acceleration when the ball reaches the highest poinrmo1 qyt/una0:a3n+ ct.

  Suppose a ball is thrown straight up. What is its acceleration jusre j29e)8qzd gp m5.sh w9 y;aoegi78bt before it reaches its i zea8r79mjp.2;qgebwg)d hoe 5s y9 8highest point?

  Suppose a ball is thrown straight up, reaches a maximum heiov 8md3a/3y4h7 b dx8dgj 2rlnght, then falls to its initial height. Make a statement about the direction of the velociaddrg38d lv m bnhx 42o7/y38jty and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls tob6(rl3q fwuo gyq5vr6a:( jaqc4h7/u0v c+v e its initial height. Make a statement about 6yr b+v 360lqeau c:(fgcuoq/v7q4wvr jah5( the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absencbp8+qc ljeng-p 0ek8: e of air resistance. Make a statement concerning i0eqj8ec pl+gp-b8 : nkts acceleration.

  Suppose a skydiver jumps from a high-flying plane. What tcx4aea/-7y s ,d( siqis her acceleration when 4d/(cayx,a e7 -tiqss she she reaches terminal velocity?

  A ball is thrown vertically upward with a sem*d /s5c t1jx-p o/mjce* lg(peed v. An identical second ball is thdcos/cgj /ml- *mje1(* 5tpexrown 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 ball?)

  Ball A is dropped from the top of a building. One second later, ball B is dr6qz8ahzzy n.t66mnpj * m 0nt(opped from the same building. As time progresses, the 6n8 6 0p.hnjnamqzm*z(zt6t ydistance between them

  Ball A is dropped from the top of a building. One second later,lz:w-i41-zb5exo0f+xwh s r x ball B is dropped from the same r:l54of+hbxzxx-iez-wsw0 1 building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One iuembkln8e-0yg0k9:bo* g) ha,qp 6pk s thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit0n-p8ak0m *ye kle)g9o 6p bughkqb:, the street?

  A brick is dropped from the top of a building. Aa2hgppt b w3m )dw1s)9 second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of thh p12w))smtbdpw a39g e two bricks.

  An object is moving with constant non-zero velocity in t / v29g(uls)(einmeq che +x axis. The position versus timlgm c n()eu qe/9i2(vse graph of this object is

  An object is moving with constant non-zero acceleratizydkg gaymz((c+ o7 rwt(eto5 i)3x95on in the +x axis. The positio y5dciy9x 7 tt( zw5g(()o3g+mzae korn versus time graph of this object is

  An object is moving with constant non-zero velocity in the +x gq,)uoog +wn6axis. The velocity versus time graph of this qg o+6)g,ou wnobject is

  An object is moving 0 hyvoa6je5x9with constant non-zero acceleration in the +x axis. The velocity versus time graph of this objev5yo 0j ax9e6hct is

  The slope of a position3qaq c2+9jf*2d4mb g*bwqkkt versus time graph gives

  The slope of a velocity versus time graph g*5rfxn5f1xk.7 mw so xives

  The area under a curve in a1nuz9 l ucy;m9v*5tdr n acceleration versus time graph gives

  The area under a curve in a velocity versus time graph givb- x52fnw)de ib n2g nxh;zi*:es

  If the position versus time graph of an object is a horizontal lin70 n,zmvpufw f5t:zt50 kk, 0w6s;j:cnybdui e, the object iswbm5 ywf n s:5tv;:i z6,juup0ckn0,z tf 7dk0

  If the position versus time graotdkg.1 s 2 t,*vf2thoph of an object is a vertical line, the object isg okf2 tdt, ht2*s.1ov

  If the velocity versus time graph of an object is ae( d :icjekuq ++.1c*9tbdrld horizontal line, the object :r b+u1 j .ek(e+tlic9cq d*ddis

  If the velocity versus time graph of an object is a straight line mahw p0ck/0-u emking an angle of 30 degrees with the time axis, thc kmeuh/0w-p0e object is

  An object moves 15.0 m north and then 11.0 m south. Find both2ihvq +l*r5 d+ bvaa(g the distance traveled and the magv* + qi a(b+havlgr2d5nitude of the displacement vector.

  A boat can move at 30 km/h in: z3uiq-.xa, knu ayz* still water. How long will it take to move 12 km upsaqiuk - 3*u:yn,xzaz.tream in a river flowing 6.0 km/h?

  55 mi/h is how many m/s? (1jmx.k8qockg6m 8 in1gq+ou4bt90 v u; mi = 1609 m)

  What must be your average speed in order to travel 350 km in 5.15 d-4b 4au+js-0k a i-fuk4idwgmw 0.jph?

  A runner ran the marathon (approximately 42.0 km) in 2 hours an;77v ro:ov epsd 57 min. What is the average speed of the ru p7e;sv7rov o:nner in m/s?

  A car travels 90 km/h. How long does iok.j o2a/oxa5 kcuh 8. +q1o0tyd5ew st take for it to travel 400 km?

  A ly (light year) is the distance that light t:hg fae2f ha h4u/;)lwravels in one year. The speed of light :a2w/g ;hu)f4 eahlhf 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/) k*y m n+z*ehmdeg4+3lbb u5dxghc48 h along a straight road and you look to the side for 4.0 se+zm*4c)x*3dnyhe5kggdu lb4 8bh +m, how far do you travel during this inattentive period?

  If you run a complete loop around annap)jbpl 3;k8v)i;d h outdoor track (400 m), in 100 s, your average veloc )jp8hpinad ; )vlb3k;ity is

  A polar bear starts at the North Pole. It travels 1.0 km southknxwy50h9x 1 x8may t., 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 aven90hx k8.txw1 amy yx5rage speed?

  A polar bear starts at the North Pok q)w70o2brkh wx1q)x0 0rog xle. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return t w1x xo gkkrh)w7 qobx2q)0r00o its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home o3 .deds1i u,*4e+ ov( fimjvamn a weekend from 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 minmj4im1o+s,id3 *(f.dvve eu autes. How far is your hometown from school?

  A motorist travels 160 km aa v5 **lsn4/be 9kzmkrt 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this tr /lvkms5 4bnk9zare**ip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her aveqfa((l (u ;m asuza:t.raf (;sqt.a(: uz(amalu ge speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h northzp4u znsb/ie08s:.0o a(grkw for 750 mileska0(w048 pg:u ni oss/z r.zeb. What is the average speed for the trip?

  In a 400-m relay race the ayv6yrar z u45* lu 7fo(z:oiwy)gs+3k nchorman (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 wh6yz5sor y:*io7k fv )lugw43zr( au+yen 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 9 s. The car's:t f5hy0l9 iug average velocity during decelerationt5g:fly 0 9hiu was 67 km/h. What was the car's deceleration while slowing down?

  An airplane increases its speed from 16co0g q(+w krl00 m/s to 160 m/s, at the average rate of (wl0qgkc o6r+$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rhy-kr(ruvz/ ug+jv.lm(r y j 21a)1brate 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, :r.7a+b :pveg(pxyx7aot u h 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 const3 r/u+ tq+d tcgp5t/rqant acceleratiog3t5tr /qtc+/ uqdpr+ n 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 2.7 m/s exper.jv3o:r6nq x4vs6c o bm+wwn.iences a constant acceleration of3c6 n.j6+s.bwv4 v o:mrxqown $3.1 \; m/s^2$. What is the cart's displacement during the first 8.9 s of its motion?

  A bullet moving horizontally to d2 jakjo-h(c7k9x i9zthe right (+x direction) with a speed of 426 m/s strikes a sandbag and penetrates a distance of 26.75 cm.ich-ado(j xj9k2 79zk What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft cdxfr l2w10 +e e z-41k4xrxz0ib bwk,earrier. It reaches a speed of 42 m/s at thkd4011 x we r2k exx4ze-+i0b,fwbl zre 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 constant accel n1.w1*bv(qcsvgi f 4neration 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 distanceqny x gmc)k44bb 0 )sh-7cnh+z)yr lu8 of 200 m. What is its average acceleb780nnkc -bs rhmg)y4)luc+ h y4zx) qration?

  An object starts from rest and undergoes uniform acceleration. Dujdrn9z*63;wc46ehv)sohpk h za v (s+ring the first second it travels 8.4 m. How far will it travel durins* r e)h4 (z36kc9 6zwsv dopn;vjh+ahg the third second?

  An object is moving in a straight line with constant acceleration. I s6 nrk(m(kxkaq+w -.qnitially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?wk+x((- a.qk6mr qs nk

  A car starts from rest and accz-8s:yer/ r tyelerates 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 at aboutry54e )yr.9i;p5g c yithlfzzzpqg6 .e (43qt $5.0 \; m/s^2$ 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 gr1 s f2weukke+p4/ )lmyeen, a car that has been waiting at the intersection starts ahead with a constant acm+ )e /1 pw4sl2ekuykfceleration 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 u -f5xr/remn( kpward with a speed of 12 m/s on the surface of planet X wher m5/nex kf-rr(e the acceleration 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 ofek)rmby/ ab,tgbgdj7u2z 0+: 12 m/s on the surface of planet X where the acceleration due to gra+r0jt:ubmd)zg /,a bby7 ek2 gvity 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 ofgfs)cr):9eau;s 4lylv wni86uc- f1 j planet X where the acceleration due to gravity isj);fgvlsnw 6:8leuya 4s9ic-c1 f) ru $2.5 \; m/s^2$. 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 pi t9 iewne-v;:j-1nw m/s on the surface of planet X where the acceleration wn-: - 1njeeiwpi9t;vdue to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is us e.:s0lx v2louually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you 0l.uls x:o2evexpect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity k jheuc0vc 6gg5 o f8.i:7i0jzyo.4o nof 19.6 m/s. What is its velocity after 3.00 n7zo ii8j jyfeov0oug.c .h: 6 c054gks?

  A bullet shot straight up+9eqnh20kc me*8 hztg returns to its starting point in 15 s. What is the initial speed of the b+ egtnh0z9 hk c8qem2*ullet?

  A ball is thrown straight up with a speed of 36.0 m/s. H(h ,qads ;ly(t+ ctca0ow long does it take to return to its startingdahcc +a,ty;(lst(q 0 point?

  A ball is thrown downward from the top of a building with an i2f vpl4zvhz )-sd7w 4jnitial speed of 29 m/s. It strikes the ground after 5.9 s. How high is tvsjz p 2- 4fv4ldzhw)7he building?

  A ball is thrown straight up with a speed ofhb3bhf a8tk:w ,x /o).sm na-r 30 m/s. (only fill in numerical value w b3xar:k,/o8mthb.nf s- )ah in 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 aind6u tvko :8z3r with a speed of 28.0 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 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 the ve4xmt uh61wb 8q+9.rjgsd - y4xq ac-znlocity at t = 1.0 s?

  In Fig. below, what is the velocity at t3i r sqnt+k 8*d)qtko3 = 2.5 s?

  In Fig. below, what is x l81mvmt)tzmg1 cd-y1ei/1athe velocity at t = 4.0 s?

  In Fig. below, what is thexd d 2zocs5g17 velocity at t = 5.5 s?

  In Fig. below, what is the average v2*,q io 5r y 0qm:b26jsy)kwghphcsn .elocity from 0 to 4.0 s?

  In Fig. below, what is the average vepylayi )u0sq s+;j :1xlocity from 0 to 6.0 s?

  In Fig. below, what is the fa1.7 ufdlnh2acceleration at 1.0 s?

  In Fig. below, what is the ac32fq:hz4e k2qkvg5o m2bflu8celeration at 3.0 s?

  In Fig. below, what is the average acceleration fyafw. r+yb9.c30vxla rom 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 to 5bm8p2dd4rc p8.0 s?

  In Fig. below, what is the displacements(5ppds+f8+jic 2x ow from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? { x6ago ei5* vr,uqftu8;0 t,pyspeed|velocity}

  An object can have a varying speed if its velocity is consta kexbhl;(8em le0 8nhy60w- slnt.

  The velocity of an object can be negative when its accebv w8 uow8v01hleration is positive.

  If one object has a greater speed than a slbfrz/k3w/czk 2g-u n*pe 733qyf (zpecond object, the first must have a greater acceleration.bc332ffe /3zpkk *(lngu-zwz/q r p7y

  Two cars emerge side by side law.)2g82lp ;zmvhy1i 1c4c1h wjqpl 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 increasij dn npvz3-p755kq2 pzng in speed as its acceleration decreases.

  A baseball player hits a foul ball straighf2ulardbb8;4 z ;d;iht up into the air. It leaves the bat with a speed of 8; 2hrlfaiu dz;bbd4; $120 \; km/h$. 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 its acceleration, k ss75r;q 5evzhow does it change if air friction is i5 ve75zsr q;ksgnored?

  As a freely falling object speeds u b ;.xoar0 )*4ycbxeo0bsp4kbp, what is happening to its acceleration, how ob4.cb)b00pxe yra 4*sxbo ;kdoes it change if air friction CAN NOT be ignored?

  An object that is throvlgr-mhr9tk :32 /tuqwn vertically upward will return to its original position with t9/ 2 rk:v ltqmu3rhg-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 veh0w ghc p1m(h8mi-b +qlocity and nonzero acceleration at the same time.

  An object can have nonzero velocity jqr,+s 6pumcs (9r/s::twb iu and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor wftfk+*y-be o8f13 -mudw9ol making no stops along the way has zero acceleration all the t y3+-btduwke-81fo *owm f9 flime.

  A rolling ball moves froo 43pdpc0 :.tqo5n zoxm $x_1=3.3 \mathrm{~cm}$ to $x_2=-5.7 \mathrm{~cm}$ during the time from $t_1=2.0 \mathrm{~s}$ to $t_2=5.9 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.4 \mathrm{~s}$ is at $x_1=2.9 \mathrm{~cm}$ and at $t_2=4.0 \mathrm{~s}$ is at $x_2=7.3 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quarter-mile2fut d/zxeme,n*8 ty -b6+xkj/phwe 9 ($1 \; mile = 1609 \; m$) track in a total time of 11.8 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 93 m away in 12 6nmow,47r2mooj (5hhndwp t :.7 s. It t764dro nhon m5tm:ww 2hoj(p, hen 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 fro3knvhd 8t;7 ckm $11 \; m/s$ to $25 \; m/s$ 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 from0qowwmxd;4w18+0ot 1v garnv $20 \; m/s$ to rest in a distance of 61 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach/psl5 /3j 5wwiyb7hej a speed of $28 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to essential/jg+v/jb i :mnly top speed abou:i b/jgv+ njm/t $11.1 \; m/s$ in the first 14.8 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 uniformlyiw: ygvr br1t)bw.0z 7 from a speed of $18 \; m/s$ to rest in 4.04 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 highwayp nx+(a0rbe.r. Assuming a deceleration (.ap0+brx ern of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truc6tmx .wu6ur* k ut0z;ft2v.ow9 lb /dhk 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 less than 30.0 min. After e bpg 1*w g8/kx/kbez ,nms+:pixactly 27.0 min, there are still 1100 m to go. The rung zbnpem :8*/s1xg,i b/kp+kwner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$