Suppose that an object travels from one point in space to another. Make a co 82t-suqwn/ k/glc8m(vd h :vjmparison betwe:g- u/(ql8jw hs/m tvcn2vdk8en the displacement and the distance traveled.

  When is the average velocity of an object equal to tfa8 1,u *vp;6mgx . /lactzmnche instantaneous velocity?

  A new car manufacturer advertises that their car cfeyc,o0s;-r* . ewejm -7ovcqan go "from zero to sixty in 8ocr,w ejqe; ome vc .-*sf7-y0 s". This is a description of

  An object moving in t0to9l(da d68fxwulc ag5-t l8he +x axis experiences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x fbe lub-u.;,w2 g,0mdjy4udndirection) begins to slow down as it.ugf0uddnjmu,l;-b w4 b , ye2 approaches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begins to sjd /4+drfa p/vs1pli ukz8skhk;i 541low down as it app r ksd u1f8z5di1+v/4;a klh4 skjpp/iroaches a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constj;)jb bgs4m u1a6-m bl(c u-ivant velocity. Make a statement concerning its acj)ui;v 1b -g6ajs bubc-4m ml(celeration.

  If the velocity of an object is zerog)vih+ y5ot p1, does it mean that the acceleration is zero? Suppog5 1+tv ihop)yrt your answer with an example.

  Can an object's velocity change direction when its acceleration is constan;p4cf b+s4m9zj(vb o*q83c jsfgb.lit? Support your answer with an e (98fp4iqzoljc;bsgfbb+*. 4v3scmj xample.

  Suppose that an object is moving with 0gdivuaj n77 2(wkg5sconstant acceleration. Make a statement concerning igw 5i(v7s 07nkd2gu jats motion with respect to time.

  Can an object have increasing speed while its acceleration is decreasing?hby)9iup,f:g9i 2 wrt9da fj) Support your answer with an ,9ribu )t) wpi9fd29jfha:g y example.

  Suppose a can, after an initial kick, moves up along a smooth *+5a jx+pfmo bhill of ice. Make a statement concerning its bf5 m oaj*+xp+acceleration.

  Under what condition is average velocity equal to the av3oe /kxeh -y0r: sfbw1erage of the object's initial and final vf bx3e s0e/r-k:o1 whyelocity?

  Objects A and B both start at rest. They both accelerate at-tq1kun33 pgi 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 objec-kg iu1ntq3 p3t B?

  Objects A and B both start from rest. They both acceleratg 1)tj iyfmte*8i+s8ne at the same rate. However, object A accelerates for twice the time as oj* y1)tefn8m i8 gt+isbject B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls hc 5(,df+i6lto blr8 sin the absence of friction, which of the rbd,hcts(6lo+f8l i 5 following is true concerning its motion?

  When an object is released from ret* toico: +p e-kv+b+3;gjgf ast and falls in the absence of friction, which :*3 g+k +v;b oa+jot-petgfciof the following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity an5hc95bjv 2 rgxvok-umc8f3 u xhr+4 2ed the acceleration when the ball reaches kfrumjo 53hh529g2 xervu-8bx+cv4cthe highest point.

  Suppose a ball is thrown straight up. What is its accz -;ktzd,x + jre60wbrfd1q:m eleration just before it reaches its hiqwze j+frb , d1t;6 x-m0k:rzdghest point?

  Suppose a ball is thro0 bmm1c x6g4htwn straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and hg 4cmb16xm0tacceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum k*xjw,c xvghe8 77o 5vbcd3e9qm*u :hheight, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball i7x,*v ojwe8h 5 7hbvxkd*9g:e q3ccm us coming down.

  Suppose a ball is thrown downward in the absence of ,z ql9ivd )s99 uofn:uul5f8pair resistance. Make a statement concerning its acceleratuz5,s8:9 9d9vo i )qlfnuupf lion.

  Suppose a skydiver jumps from a high-flying ph)w 7sj/7a .n ps4kec khg7x2tlane. What is her acceleration when she she reacheshh 72kgck.7a n/7pjtes)4sw x terminal velocity?

  A ball is thrown vertically upward cb pqni.kqq)(4u3x: 0 nri.kw with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maxiuix.0qrcp4k3.n qq)( kb n :wimum 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 zqc569k : sbkf(wug o(top of a building. One second later, ball B is dropped from the same building. As time progresses, the distan :c u(s5(k9bgkow fz6qce between them

  Ball A is dropped from the 16m/xp ( a/wm ad4aly0o s ntv4r2dts4top of a building. One second later, ball B is dropped from the same building. As time progresses, the difference in t2s/ao 6ma 0swtxdl(/ y4414na pvmdrtheir speeds

  Two objects are thrown from the top of a tall building. fy e vck .c1htb. +p6ud/3n8yx One is thrown up, and the other is thrown down, both6chef xk 3dvn + p/1y.b8tcy.u with the same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A se0bn +vg7k morom)jh0 (cond brick is thrown straight down from the same building. They are released at the same time. Neglect air resish +gboro n0jvm7k(m0)tance. Compare the accelerations of the two bricks.

  An object is moving with constan kx2-hdq:gm)4b *sw2 w9zcex4e lud4l t non-zero velocity in the +x axis. The position : sm bed-2wh 4x)42lq9d elux*zcgwk4versus time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. Th v(gg af,f n-fvio;)lrsk,e)/e position vera ,v)l),ffi gro ;k-n/sevg f(sus time graph of this object is

  An object is moving wit)k urmgfm0i hf;nfvv,/cr59 3h constant non-zero velocity in the +x axis. The velocity versus time grap,chfrn3gi/0ur5;m 9mf ) vv fkh of this object is

  An object is moving with constant non-zero accg1ihxpbb;;e)iee-b t88x u3v eleration in the +x axis. The velocitvgbebbx8i1 te38-i; hp ;x eu)y versus time graph of this object is

  The slope of a position versus time grapo6f t+ r e63spj0eo; ,dtsfm,uh gives

  The slope of a velocity versus time graph giveskelar /uh /5am9t5d 3d

  The area under a curve in an acceleration versus time graph q(205ed:sh0t f7i;wdhufz ti gives

  The area under a curve in a velocity versus time graph *txxxw)vpyl pv8 b5 (5gives

  If the position versus time graph of an object p sbj,r;ae4zu6hh,( dis a horizontal line, the object peurdszh( b;6h4a,,j is

  If the position versus time graph of an objecze bcu x1+u(9f53zlibt is a vertical line, the object is 3+9bu zxc5l bf1uie(z

  If the velocity versus time graph of an o(s9-q; r fmgfybject is a horizontal line, the object isgy;r ffm9(-qs

  If the velocity versus time graph of an object is a straight line making a ab0qb+qti+q 2z2 *+unp;xrqfn angle of 30 *qn +2+fb0;+xrpqu t i zqba2qdegrees with the time axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distananfc0exim71q6;z flg4ec )s. ce trave4f.xe0;) aec 6n c1szml7gfq iled and the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it f,9m(62exinuu xsgn3 take to move 12 km upstream in a river flu69 (gxx3ue nis2f,mn owing 6.0 km/h?

  55 mi/h is how many m/s? (1boz0k lhpslr+3734,.wz da kz mi = 1609 m)

  What must be your average speed in order to travel 350 km injlr mxuv 1p5cdgx/.r*/1tbxt r990 ge 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hourjmb0.ehdvi(x 72z0 kgs and 57 min. What is the emg(h20vk0b. zdjx 7 iaverage speed of the runner in m/s?

  A car travels 90 km/h. How long does it take q*u8navfe n60 (x/ jyg9xvdja .i (u9hfor it to travel 400 km?

  A ly (light year) is the distance that light travelm 004vmeogrr. s in one year. The speed of li oermv40g0.mr ght 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 look to t04d+b; w/dqcj4qvo le o)xyj 4he side for 4.0 s, how far do you travel during this inatt q)e+ wbd j;x0444o ylqdcjov/entive period?

  If you run a complete loop around an out k+ exwpnnz39z9os ji,4*7yzodoor track (400 m), in 100 s, your average velocityxnow4 + zy9p*koe3szij n7 9,z is

  A polar bear starts at t+fm*jz w9 x4q.xhnh9odp) th3he 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 zmd qhnxh4to jh*9)9x.3+wp ftrip takes 45 min. What was the bear's average speed?

  A polar bear starts at the Norti3nu+p ln, lp)d oam17) vd*pth Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km nor adm1vt7i+ on pul ldp,p))n*3th, then 1.0 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 4,-dej(z2( kjmablwka ; 6njseh 2h0ga 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 minutk-h06 2z4;s ,(m jeaej2ng(hklwbadj es. 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 thjj,;vqvpyy- .4p8caee average speed o - evyjj.pyv,4;p8 caqf the motorist for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100ef2 za-gj 9,,0 17xsqunut+ad6 uw buy km/h. What is her aversu2qu0 z wue96yadun g,1+ ab,x-tjf7age speed for the trip?

  An airplane travels at 300 mi/h go6 u(n jn togrktd/a-(- d57vsouth for 2.00 h and then at 250 mi/h north for 750 miles. What is the avera /u-tnn ( -o(tjg56koadvgrd7 ge speed for the trip?

  In a 400-m relay race the anchoraupc d:q ,a77rnkewplt 3 ;2j:.zeu n ,-pci8hman (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 when the team A runner starts the final leg of the race, in order that the team A r,tnce 2e3:,8cdr: 7; pka.-znijlwuphqa p 7uunner not lose the race?

  A car decelerates uniformly and comes to a stop after 10 s. The car's a pimvoi)d2g 7sj2,0tgverage velocity during deceleration was 36 km/h. What was the car's deceleration while slowing dowgjs0)2to i2g7p imd ,vn?

  An airplane increases its speed from 1 0obotx5.pg p11sk d3o00 m/s to 160 m/s, at the average rate of x do o03o11sp5. tkgpb$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/hie-. azumpst 0/n 5z*g:t+csk accelerates 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 rest and accelerates ad*z,he288toa *i v9:r/ vlii3hbs idvt $4.0 \; m/s^2$ 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 const8a(ky07 j lbkaant acceleration byk(k8a a0lj 7of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocity of 7.3 m/s experiences a constant acceleration oojya3t* dt,x kyr f-pk(g02v,fx,kp o0g3-kfdt2( ,a*tvjyry $4.9 \; m/s^2$. What is the cart's displacement during the first 4.0 s of its motion?

  A bullet moving horizontally to the right (+x direction) with uh+i 1in 7p:hmb it /+vql/q(ba speed of 583 m/s strikes a sandbag and penetrates a distance of 43.76 cm. What is the av //b1 qipvl 7 h+ui+ni:hmtq(berage acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a2bvq: fyu +-os 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 the leng oy +qs2b:f-vuth of the catapult?

  A car starting from re c 6qk6a 6hc1r:qnbez. lwcw9-st moves 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/sm, n.6 dzsvkya2dml *3a.s7gd in a distance of 200 m. What is its average accel*s6lk.23ma d d,nav.d 7m zsygeration?

  An object starts from rest and undergoes uni4d)ksv; sf n;;fz bo-)xf7jfzform acceleration. During the first second it travels 1.9 m.dvjb4f) ; nfk f;zx7-sf;o)z s How far will it travel during the third second?

  An object is moving in a straight line with constant d 8ys mb c-q7srs4s3x2acceleration. Initially it is traveling at 16 m/s. Threess qsxmrysc3 -287db4 seconds later it is traveling at 10 m/s. How far does it move during this time?

  A car starts from rest and accelerates uniformly a /vz0b4q d0loat $3.0 \; m/s^2$. 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 oo;kj5fd0+vdezcg .v sv tp ;ex29r9i(n 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 pyby82a2 q+lclight turns green, a car that has been waiting at the int a2 2lbcq+yy8persection 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 upward with a speed of 12 m/s on the surface ofpb8knv b)e-c banjv:ipd ).,q063l ym planet X where the acceleration due to gravity d)pb3,vk.q 0j) a8b:mp i-vbly6 cne nis $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of 12 m/synt .80spyav:i iz* ,u on the surface of planet X where the accelerationa i ,uyn t0v.*is:zp8y 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/ssg+hg w 5rtw f a6;v6muw;aetr7t:i+ + on the surface of planet X where the acceleration due to wr+mr 6tegsa5g :u7 w;a+if6+h t; vwtgravity 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 surfa/8jp mlwm +x1dce of planet X where the acceleration due to gravity is+8jlp1m/wxm d $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is u(x 2;0rl6eacnr;tdaai9 7 ax rsually greater than 0.10 s. If your friend holds a ruler badtar6xc9 7;;e 2xla0narir ( etween your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it?

  A ball is thrown upward at a velocity of 19pt z6oig(q y7x97.y-vs ymr5c.6 m/s. What is its velocity after 3.00 i t9 y s(gcoypmv.5 qx7z-r6y7s?

  A bullet shot straight up returns to its starting point iu) a-ksokg- w*rg21dpn 16 s. What is the initial speed of the bullets-* ur oa)2-wdk1gkpg?

  A ball is thrown straight up with a speewr13znu7 vir/ d of 36.0 m/s. How long does it take to return to itzw3i 7runvr /1s starting point?

  A ball is thrown downward from the top of a bu:r 6hmek p5ql9ilding with an initial speed of 8 m/s. It strikes the grome6q:lp r59 khund after 3.8 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/vy),b-uv*dj qs. (only fill in numerical value in the b,)j- vdquvyb* lanks)
(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 5ifu6esr+(rkmt 3n(9;zjcruz qhu a:9u k7.gthe air with a speed of 30.9 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 12 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 12.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at t = 1.0 s?:d9199iynhesnko o .jwt;va;

  In Fig. below, what is the velocitya:cdr6yrw7ca fe/o.b + xig+4 at t = 2.5 s?

  In Fig. below, what is the velocity at t = 4.03+zcia5 /(snfwd7tai s?

  In Fig. below, what is the velocity at p e0p2b/crsiqb-.-gv5tk ++ t; ikwvct = 5.5 s?

  In Fig. below, what is the average velm.- kjasw5piylr / -r y0(-snnocity from 0 to 4.0 s?

  In Fig. below, what is the averdidqp r 9l515 v)wl k6ai-n-hbage velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 sns8hpcfmh8s)3 (i6ra 9z0atw?

  In Fig. below, what is the accelerab5o y5q gey4-v4msc v4tion at 3.0 s?

  In Fig. below, what is the average acce lkef(.4bity / +1c8 xhajqfu+leration from 0 to 5.0 s?

  In Fig. below, what is the average acceleration przc 1it. 9rpl+zjk3/;nv qg lgy-h:4from 0 to 8.0 s?

  In Fig. below, what is the displacem)dkpgn7q 4 *fvent from 0 to 8.0 s?

Does a car speedometer measure speed, velocity? {speed|tdiypk4 6 j-t)velocity}

  An object can have a vary 0/hdjo+bmue8ing speed if its velocity is constant.

  The velocity of an object can be negative when its accelerat0x5jl/5bi7 3ob vkd.xztc 2obion is positive.

  If one object has a greater speed than998dc z6k b izjh/mva2 a second object, the first must have a greaterk2cd89jv6m9za/ izbh acceleration.

  Two cars emerge side by side from a tunnel. Car A is tracu2 a(k+ +ifoys.eafbzvk0+ /veling 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 ly kd,3oc*a vd3 yy7n)in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up into the air. It leaves the hse*7d p9ash9bat with a sp a *shdsphe799eed 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 objej/o)y,znff 6e ct speeds up, what is happening to its acceleration, how does it change if air friction is igze,no/)j 6ff ynored?

  As a freely falling object speeds u68hscaqyj f1wtq/ 9j 4p, what is happening to its acceleration, how does it change if air frictionjqw s /jaf649ct 1qy8h CAN NOT be ignored?

  An object that is thrown vertidrmfj n x7asuqtkh95wf64 *5 2cally upward will return to its original position with the same speed*atff72k5xn5j h4w6s q9u md r 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 velocity and nonzero acceleration at the s+ eu ti rvh4nj6d(3hl :ct46q5a5fnq,k1shx zame time.

  An object can have nonzero velctbe:mtqlw qcl9 t+-ea3+ +,e ocity and zero acceleration at the same time.

  An elevator moving from the second floor to the fifth floor makin1bh9ivb+ h2:/s9zp- 2a2 tiw unxlwmeg no stops along the way hi/p2h9zwnwul be9 2 +bathmsv1i:x 2- as zero acceleration all the time.

  A rolling ball moves fron 1m 77.xkza 2+yroiq)s/ dnoym $x_1=3.4 \mathrm{~cm}$ to $x_2=-7.8 \mathrm{~cm}$ during the time from $t_1=1.4 \mathrm{~s}$ to $t_2=5.8 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.5 \mathrm{~s}$ is at $x_1=2.6 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ is at $x_2=7.9 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight completecx ;j,y 6:u62dttdf3qf d bw5a laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 6.3 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 lin36r1ywtkw6okqt(8 b:g x y nsp4r zv69ehc,u8e, moving 97 m away in 10.6 s. It then turns abruptly and gallops halfway back in 4.7 x,r9po68y38s z rht 6b14: nqv(cuw ketkyg 6ws. 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 froa: m qxrd:,vqk2c9 ))ilibm h9m $10 \; m/s$ to $24 \; m/s$ in 4.7 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 frombtzu6 hu;;2oqs0 it(z(fmp4 g $16 \; m/s$ to rest in a distance of 75 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach z(s,o w3wlo n2a speed of $28 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.3 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter cvjb egfr9+w2on ( ucig*7-2hsan burst out of the blocks to essentially top speed aboutof+ v 7 ujghs 2-rien92gb*(cw $10.3 \; m/s$ in the first 10.8 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 uniformlyxcz m53maso8 ; from a speed of $17 \; m/s$ to rest in 4.42 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, amwgim.7oi;xl*t c 0p:.b7cakjqyq)/ car leaves skid marks 92 m long on the highway. Assuming a deceleraoijx. yk .pqi7glc0b) mqa7w:;*/ct mtion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a tr:9n 5xlvfrn 1duck 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 exs bn/rh9mnth(zj 9ux;9c; yiy m+ nt*/actly tm hntj /9 9ni;crmxusny*b+/y9z( ; h27.0 min, there are still 1100 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$