Suppose that an object travels from one point in space to another. Make l(2tfx6xno )bx r+t 0ia comparison between the displacement and the distance travelxx(intt2 +xf0l ro)6bed.

  When is the average velocity of aneq fmr wf 5:6k)v)sqy9 object equal to the instantaneous velocity?

  A new car manufacturer adfrrt:v. 3q;vj j(x kk4vertises that their car can go "from zero to sixty in 8 s". This is a dev3r:4qjr vftkx(;. j kscription of

  An object moving in the +x axis experiences an accedf*5e 2r-)-gzcfd noz leration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x directio3,wtd3wfmzo1g 5hir h.c1x 9au9x e j:5,uznsn) begins to slow down as it approaches a traffic light. Make a statement eca95i3hxsu39z w z,d1 ou.:jgmx1nhf,rw5 tconcerning its acceleration.

  Suppose that a car traveling to the West (-x diregnrbr;o6 )mfb8kn2j 6ction) begins to slow down as it approaches a traffic light. Ma6rgn8brkmj;2b) f o n6ke a statement concerning its acceleration.

  Suppose that an object is moving wit 9) yrtir f1dlkblno+xu)3f +-h a constant velocity. Make a statement concerning its acceleratio r +)oldn 1klf93ytr+xb -i)ufn.

  If the velocity of an object is zero, does it mean that the +vhqw: zoyoeh3( 6e4xacceleration is zero? Support your answer with an examp eoxhq ov(wye3: 64hz+le.

  Can an object's velocity change directs nx8(5xqw vvjqp19: *mecn9lion when its acceleration is constant? Sup91s lmqjcwx5e 9q:n8* np (vxvport your answer with an example.

  Suppose that an object is moving with constant accele6upey9cd p b2+ofm5qijb 2b )9ration. Make a statement concerning it omeb2+2bfy 9q5pp)u6j9cd ibs motion with respect to time.

  Can an object have increasing spe0c66 e9kuw giwed while its acceleration is decreasing? Support your answer 696wek0 icwg uwith an example.

  Suppose a can, after an initial kick, moves up along a smooth hill e r9ob4su5 w nbro()e+of ice. Make a statement concerning)r ron5e9 obue +(s4bw its acceleration.

  Under what condition is average veloci7nb2f5aygt 7zty equal to the average of the object's initgbfa57 n7tz2y ial and final velocity?

  Objects A and B both start at rest. They both accelerat 8)ygm27+guunlfgsdhsk *r;g+j;s l 9cy+ j5te at the same rate. However, object A acce*rn m 9sdugk8g jl uhsc++ 2s+7tfj)gly;gy5; lerates 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 ajsq2i25 -+4a ak zgzzjt the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of objsjz25zz4-+a ikj 2gqaect B?

  When an object is released from rest and falx rhcxu 9 aq5 rv::us3brls;y s+6r;:dls in the absence of friction, which of the fo+qv;dasrl::c by3:; 9sr 5suhxrxu6 rllowing is true concerning its motion?

  When an object is releas5h x5qpge gi4occkq*/ qcsdo + /+e2y1ed from rest and falls in the absence of friction, which of the f/gy5sh*q4 o5cdo+ xg/+k1p eccqq i2 eollowing is true concerning its motion?

  Suppose a ball is throw2e 4lkw yn0w7vn straight up. Make a statement about the velocity and the acceleration when th7wk4 2 nyel0wve ball reaches the highest point.

  Suppose a ball is thrown straight up) q/5ofes,xh jvt((vysl. 2l*uf3u8ypcsyi9 . What is its acceleration just before it reaches its higf ,.8vu/9qs yiey *uv spoxtscy(h)l (32f5ljhest point?

  Suppose a ball is thrown straight up, reaches a maximum height, thenhs58xn w+ ( ppsli*2tn falls to its initial height. Make a statement about tptsp5n *+8xh2lws in (he direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then fallslrdh2j 6oxy3xz ,q0w ox* 7jg2 to its initial height. Make a statement about the j* q hr3d0jg7o2zxly2wox,x6direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downwex8of7k4 m2mhard in the absence of air resistance. Make a statement concerning ih7f o2km8x4e mts acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her accelerdyr7fyh5 iyo z 7efz c)bnn)*tu)95t)ation when she t)yd e9)5y57o 7tycn)rfuf)ib znh*zshe reaches terminal velocity?

  A ball is thrown verticaxaw *s8o60fad hye al6z+)q 2d ym,zz2lly upward with 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 of the second ball to that of the first ball? (How many )82h qs2a,e+l ydz w 6zdf06ax *omzaytimes higher does the second ball go than the first ball?)

  Ball A is dropped from :cx2f,f:s v0fkj9*moc cur7bthe top of a building. One second later, ball B is dropped frs02f*fmckfc9bcjv:u :7xo , rom the same building. As time progresses, the distance between them

  Ball A is dropped from the top of a buildi7s.kpxfxpm kd* i /s)4pih9-q ng. One second later, ball B is dropped from the same building. As time progresses, the diffex7xkfq ) m- *ppkp4ss hi9/id.rence in their speeds

  Two objects are thrown5isb+2 ybr0 l k5-hxnq from the top of a tall building. One is thrown up, and the other is thrown down, both with the same initialkb0+55ys 2x-b r nqilh speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A second brick isgq: t+kaws9;d thrown straight down from the same building. They are released at the same time. Neglect ;q:kgwt+ d9saair resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zv8z. z6 v .1i:tdiumvhero velocity in the +x axis. The position versus time graph of this object 6m uid1:t z..8vvhv ziis

  An object is moving with constant non-zero accel*yk4)fsti3 8z tb x*izeration in the +x axis. The position versus time graph of thissx*4t i y)8i *tz3kzfb object is

  An object is moving with constant non-zero velocity in twlgc1us 0 (m.vhe +x axis. The velocity versus time graph of 1vlsu mg (0wc.this object is

  An object is moving with constd uv s2qof*b :o7fwq;2wp owrw289 so1ant non-zero acceleration in the +x axis. The velocity versusbw8sow;2r9 ooo:d1uv2 7sw fp2 wq fq* time graph of this object is

  The slope of a position ku8 .rzz1rkbe)gqki)5ck) o3b5g3bgversus time graph gives

  The slope of a velocity vsm.,+ gj4mtd u jnkuy:8n,mu4 o t /k3v.(tykaersus time graph gives

  The area under a curve in an acgqid io9*af:bz9,+w9k l5a bxceleration versus time graph gives

  The area under a curve i8 6 ;46jbbqv+u x;vpm ui)+hjlkx uyk7n a velocity versus time graph gives

  If the position versus time graph of an object is a ho 40nxp:0 n an)qt9lxg:r8 jsycj+kov:rizontal line, the object is gy pvkon +rx0:ql0xs ac8n: n9:4jtj)

  If the position versus time graph of an object is a vertical line, tcznvf p-4z1/ i*n5u y-7cl efphe object isvznfl zp4-fc5y/*7cu1-iepn

  If the velocity versus time graph of an object is a horizontal lrr 7 zc)6+ju 8knda8kfine, the object isd 68urz7 n8crjk)fa+ k

  If the velocity versus time graph of an object is a stra:p h ;itr((trgight line making an angle o :ittrh ((;grpf 30 degrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find bojljd 89p) t9csn7vxq5s lb**pth the distance traveled and the magni* 9bj )9dqncp7l*8st vj5 xlpstude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take toeq/ ol.d d-9i+e a)lj7gbe*jyc3pc (oop(7 jh move 12 km upstream in a river flowpe3(daq j97e y*bcg.p+l oj7hejod)co(l- /iing 6.0 km/h?

  55 mi/h is how many m/s? (1 mzn30 rlfj3v1oi = 1609 m)

  What must be your average spb497fbc 7. xkagia1qceed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) ii -ww.0o5cedc va c*m6n 2 hours and 57 min. What is the average speed of the i5cwv c.e6d -wma0*oc runner in m/s?

  A car travels 90 km/h. How long does it take for gs wq982dq6+,v vmmrnk47op;q-v o vrit to travel 400 km?

  A ly (light year) is the distance thad7 )o+dr ehzlxw/me31 t light travels in one year. The speed of light ishdl)wr7e3oz/edmx +1 $3.00 \times 10^8 \; m/s$. 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 stra+reit*,mhg0v a *1+:b ux ozynight road and you look to the side for 4.0 s, how far do you travel during this inatti vgbyer+n h *0m*zu+ o:a1x,tentive period?

  If you run a complete vzz6f z67hp is9*tgqydo /;y3loop around an outdoor track (400 m), in 100 s, your average velocity ;/*d 9sozh6ypt3z izvgq6 f7y is

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 kzuqe /n:x mo4 t/-;dbim east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. Wha/ox ;bmzu iqt :-/nde4t was the bear's average speed?

  A polar bear starts at the htb b,q/ 16hlsz lsw8+North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.l8z bs16wh/l+ bsqth ,0 km west to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from s - gda6(:icjzbchool at 55 mi/h for 110 miles. It then stard b:ji6ag-(zcts 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 school?

  A motorist travels 160 km at 80 km/h awggo,kb okt 0o2ww531nd 160 km at 100 km/h. What is the average speed of the mot0go1t5ow2b3 ,wkko wgorist 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 ae f c)c93j pxmgkk r5.50lyk1vnqf (7dverak1)fvlrk307f c.xcgj9dyp5nqk m e( 5ge speed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h 3 j8fg leb9dh6and then at 250 mi/h north for 750 miles. What is the average spee3jge8 d6hblf9 d for the trip?

  In a 400-m relay race the anchorman (the peo)z 42a9ndp cmrson 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 fincm2 n 4poz)9adal 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 10 s. The car's average fa r plcua5k6e2rf7dyfx045.velocity during deceleration was 75 km/h. What was the car's deceleration while slow .a54urx5rdyp20k7 f6falc feing down?

  An airplane increases its speed from 1..p ty .mc ,2vjj)jhpx00 m/s to 160 m/s, at the average rate of hj v )p.2myjjcxt. ,p.$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h acceleratess4)yjy5 7ut ud 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 rg40c.ka k0ufq+;7 +mj *efdkxkqga2best 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 ag4cl+ yp 74hc9 xkus.qwd)i1v constant acceleratio.i+cq ldvx7)g4 cs yp91hukw4n of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initialm(m2zvvwb dr g2lwlmp 7 d3*1 ax4b;o7 velocity of 4.3 m/s experiences a constant acceleration odomv1 lmmg 3a wzxbl;4 w2rpvd (b72*7f $3.8 \; m/s^2$. What is the cart's displacement during the first 9.1 s of its motion?

  A bullet moving horizontally to the right (+x directio. zv m 7cendwn.y)f//mq0e 9uzn) with a speed of 385 m/s strikes a sandbag /ncm0 eyq7/eum9.vz wndf.) zand penetrates a distance of 14.26 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launcj/+za;ob3.ihy0b i ;hil wc4whed 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 isbj/li40 iih;ozc.w ya +3 h;bw the length of the catapult?

  A car starting from rest moves with consa +cr+qcrt y ::1rvcl8tant 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 /z1w zluj 597muiek.g distance of 200 m. What is its average acceleration?1mgek9zz5ji /uwlu 7.

  An object starts from rest and undergoes uniform a 7d6.b7d(l(j/2g emo zdnlg;hkfis/ rcceleration. During the first second it travels 5.4 m. How far will it travel during the thirdbrg( j(s lkfd./76dhdl;z7o i2 nmeg/ second?

  An object is moving in a stra3 90 i(4a4rylihe2ia 8c7tvvo.b jhtl ight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it movj 0l 8tli4i r2aoi7va(.cteh b4yvh39e during this time?

  A car starts from rest and accelerak2hk2u-s a u j+(sd3ehtes 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 tirecp8 xy( gcs1o2s 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 traff qxl3ayscb moa)6) */bic light turns green, a car that has been waiting at the intercb/)a) b oa3x6 qm*ylssection 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 m./j9kzq0 cfoupward with a speed of 12 m/s on the surface of planet X where the ack./zqm0 9f cojceleration 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/ yh; auoyte;q:8z1 2rts on the surface of planet X where the acceleration due t1roh:y; e 28;tqa tyuzo 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/s on the surface of plvtt 23 ++bca7jgahejvd-gs7 4anet X where the a2ag-g7vjtj4 tb3hvce+7s d+ 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 plane,5f1 s 0l,eb,bfaxhp kt X where the acceleration due to gravb5,0l , afhf,1 bexkspity 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 rul,dssz;y0nu 2 zer between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch yssz0z, u2;n dit?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity aftew gv(f1a:gmiv,t j 6+ x8hs0mmr 3vmvmt(,0m a:x6w1sgjh8g+ fi .00 s?

  A bullet shot straight up returns to its starting point in 12 s. W 15l5euse:2q* rqhvphhat is the initial speed of the pe:v5h q152 sehq* rulbullet?

  A ball is thrown straight up with a speed of 36.0 m/s. How long does it taf3w) tw q,pg x8( e-so9nds5qcke to return to its starti qes)pg- ,d(xfwn9 cqosw 3t85ng point?

  A ball is thrown downward from 8 hx;z +2dovctmtor2ou 00n,qthe top of a building with an initial speed of 6 m/s. It strikes the grmto+qrun 0hotd8c , ;x z022voound after 1.7 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only filtxzel1v9p8 2 u7 iqr7so0row0e((xbe l in numerical value i(pxebr sl wtu x0ez977o i12oqv8re0(n 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 st c7pik7k9pjvk 2, bmx3raight up into the air with a speed of 29.0 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 1 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 = 1.0 s lzbr1 m7g6xxm7p rqf/nx)6/w?

  In Fig. below, what islh9kitq w,svkh *.r )q ;.c,qi the velocity at t = 2.5 s?

  In Fig. below, what is the velocity at t 1n,x6f u t1sdu= 4.0 s?

  In Fig. below, what is t6p63a ko37schy rk* bhhe velocity at t = 5.5 s?

  In Fig. below, what is the average v4m0juz)pvhd .6i . x hrrr;n1velocity from 0 to 4.0 s?

  In Fig. below, what is the average m( ..vvyhcta) b4-p.;xmdhxj velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleratipzl7nd p9so* xd.i1w8on at 1.0 s?

  In Fig. below, what is the acceleration at 3.0 sj f/s,3(v d 9fvfjubk1 xu*vz(?

  In Fig. below, what is the averageq q4pbs)9vsk.6qxa 6z acceleration from 0 to 5.0 s?

  In Fig. below, what el +q.pt+5 d0bnh0qeu is the average acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 0wf3smu-)rvtz0- r swk r/;ar to 8.0 s?

Does a car speedometer measure speed,9mc-j2nu, ila velocity? {speed|velocity}

  An object can have a varying speed if its velocity is con)k6x thwzb ylag+ n-+:stant.

  The velocity of an object can be negative when its accnv,z /p5 rp (:dkm8lbqeleration is positive.

  If one object has a greater speed than a second object, the first must have a 4ley )iv5*at ygreater acceleratiolv4 e)t*y iya5n.

  Two cars emerge side by side from a tunnel. Car A is traveling with a speed ;n)i u99z0 rl+khavxfof $60 \; km/h$ 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 v ed;-89hjpbqas its acceleration decreases.

  A baseball player hits a foul ball straight up into th+pqogl(a 2sk/ e air. It leaves the bat with a(pasgkl +/2oq 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, what is happe+rd b(n3ywu+ ;8twjdkning to its acceleration, how does it +tw r; b 8uk3dd+(nwjychange if air friction is ignored?

  As a freely falling object speeds up, what is happening to its acceler ( hhzxf50kg z3mz*v0vation, how does it chaf0zkhzm30* (gz5xv vh nge if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its orig6jp+0 bvs, sspi8ldp8 inal position with the same speed as it had initially if air resistance is negligible. If air resistpbs0 86sisd+jp8 l vp,ance is appreciable, how will this result be altered?

  An object can have zero velocity and nonzero acceleration at the same x 6phys-,bqlr ti5s50time.

  An object can have nonzero velocity and zero acceleration at the same ti0yqxz 2xa f,o;pa40rxme.

  An elevator moving from the second floor tlid*rfm/ 8cb a axx(,:ia.d, zo the fifth floor making no stops alongx,a:*/.dm rf8(x daiib,zcl a the way has zero acceleration all the time.

  A rolling ball moveswc)zf0xl.c 7 p from $x_1=2.3 \mathrm{~cm}$ to $x_2=-5.3 \mathrm{~cm}$ during the time from $t_1=2.5 \mathrm{~s}$ 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 $t_1=-3.6 \mathrm{~s}$ is at $x_1=3.2 \mathrm{~cm}$ and at $t_2=3.2 \mathrm{~s}$ is at $x_2=7.7 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around z)9wdd8yc 8dsriz d 3 +n,ad-ua quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.1 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 straigh.w 4 s 5lgzg,uipqpyj-/)u1lx 6k3 amtt line, moving 110 m away in 8.8 sljk 3/a- gu wpg.py1,sum4izt6l)5xq. It then turns abruptly 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 from i3) tepgn27to $12 \; m/s$ to $22 \; m/s$ in 5.7 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 -+qyd3s y(4cc c5aysg$20 \; m/s$ to rest in a distance of 60 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reap/:xhom lmp+ 7ch a speed of $32 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.1 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst owyekr6c:-g 5d ut of the blocks to essentially top speed abou- cek:r yg5dw6t $10.4 \; m/s$ in the first 10.2 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 uniformlny oy;1mu5a,m :4wzkw u: lbp8y from a speed of $16 \; m/s$ to rest in 4.75 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 highway. A 3t9 7/tik0a jz+tjp z*+pgxurssuming a deceleration of puk9 x7t +jjz 3g+/pa0irzt *t$7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck go c9f;-b:53vfx .:edvyib6pp9hw mw(n es0u pwing $25 \; m/s$ 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 3k( 8ct/ 7etjkq32ipq qzl agu17ib/t/0.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner mus772kqb/itcj a/q l 8kt qi13z/(ugp ett then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$