Suppose that an object travels fr .98-x 6dx /-/ss,ggpazm xpyde zrt0wss*7iuom one point in space to another. Make a comparison between the displacement and the distance travels*-/ugz myd w9/xdesgrx-. x tp7 ps6a8,s0z ied.

  When is the average velocity of an object equal to the instantaneouny (mblsi.o.b;zj(0l e:blk , s velocity?

  A new car manufacturer adverh.pf(w*lo; (rfd1b oye/(lis tises that their car can go "from zero to sixty in 8 s". Thishp ;ly i*e(ow1 of/rbf(ls.(d is a description of

  An object moving in the +x axis experiences an acceleration of zt. v)cb2n0fc $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direction) begi-l1 dzv7ubqwvv 174:j68za f+wu oaku ns to slow down as it a - jlvu8a7v 7vfz+:w6dua1q1bu zwko4pproaches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to th7y 1t5wqeu/z 2 si(yy2p vge+9b5. fljorkj+q e West (-x direction) begins to slow down as it approaches a traffic light. Makef . +wg2/iyu( 9py55+ktojqzlb7ye er 2j1q vs a statement concerning its acceleration.

  Suppose that an object is moving with a con15 i,c f+ im6yxldt9o404l3m:yn i:onyls axxstant velocity. Make a statement concerning its accelerno,xy:tll5i 4i0cys6:mxinaxm of49 dl3y+1ation.

  If the velocity of an object is zeros/ hg*qp8fjp;5u.co4d,3e qum 8yf ua , does it mean that the acceleration is zero? oup;,c48uadgqh ff3 y8uq/. 5ps me* jSupport your answer with an example.

  Can an object's velocity change direction when its;;rlllj tb18ra 3tl/c acceleration is constant? Support your answer with an examp8tbr1 ;la3rjl llct/;le.

  Suppose that an object is moving with constant acceleration.ev qwe-,4fnq- Make a statement concerniv,-w nef4q-qeng its motion with respect to time.

  Can an object have increasing speed while its acceleration hxv*68ebwk 26ti cl w*is decreasing? Suppoec86 k6 2*x*ivbthwwl rt your answer with an example.

  Suppose a can, after an initial kick, moves up along a smooth hi)*+c4ms;bwcp mx ow+an4 wl (oll of ice. Make a statement concex 4lww npsm; +o+*wboc 4mac()rning its acceleration.

  Under what condition is average velocity eqz1 +-bn myjoa6ual to the average of the object's initial and final velobzj+6 -om1yan city?

  Objects A and B both start at rest. They both;49)9tui)adspl;9lukiiu xoc+a2t7z ) bln h accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compa9)ip;9i+klhd il 2n c;)axalzub ou4)97tsutred to that of object B?

  Objects A and B both start from rest. They both accelerate at the same *g10y7t jwly urate. However, object A accelerates for twice the time as object B. What is the distance traveled yj1g0yt*l 7uwby object A compared to that of object B?

  When an object is released from rest dd)* r32wr;m ,zope7 6c0xrulyudzv g:ie5m +and falls in the absence of friction, which of the following is tru+*durzrm0v ,2) gzrycil m7 ;wexeo p6dd:u53 e concerning its motion?

  When an object is released fro.0yqct0dv)r8 q kbo,m m rest and falls in the absence of friction, which o.rqc)bvqo d,0k y 0m8tf the following is true concerning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity an ffgtzh.d p+3+r)q-bhd the acceleration when the ball reaches the hig.rff)+hz bpdq- h3t+g hest point.

  Suppose a ball is thrown straight up. What iwm 49 l* oxnts.j/n1m32d qj9j+kemk bs its acceleration just before it reaches its highest poinmn3j n+mwmkk.q d9xe/j2 t o1*ljb94st?

  Suppose a ball is thrown straight up, x/2aarnl eg :5qhq; nkq56ue: reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and lk unq;/aq52ar:qex:h 6g5ne acceleration as the ball is going up.

  A ball is thrown straig vw2 4fd8 -u3evvwrw:tht up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity fv-4w edv3vw2utr:8wand acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air rered rl2rwb i:aw 0ul2b7r,:qbs1 b/0o sistance. Make a statement concerning its acceleration.o2rbb1 l0wsaibq: 7e2 : rrrd 0wbu/,l

  Suppose a skydiver jumps from a highb18gy1 k ws2(odbd 6j c-wjh0g-flying plane. What is her acceleration when she she rej6-j1wh y s0d8wbcgdbg( o 1k2aches terminal velocity?

  A ball is thrown vertically upward with a w: h/8 /viqoqvib;s .gspeed v. An identical second ball is thrown upward with a speed 2v (twice as/;:iiv8h .bs wo/qqgv 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 0bous lsi5z/ynh 1 s5vcis/ ,8ddv1 s;the top of a building. One second later, ball B is dropped from the same building. As time progressedo5c ssyud1vs bi ;s815n 0sh/zi/l,vs, the distance between them

  Ball A is dropped from the top of a buit j3;4bbs0dohlding. One second later, ball B is dropped fro4 j3;0sotbb dhm the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of yt *lhnc00l*s a tall building. One is thrown up, and the other is thrhnycl* t0s*0lown down, both 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 second brick is thrown str9tel t 05bdeolu4c7-m aight down from the same building. They are released at the same time. Neglect air resistance. Compare thetduoc5t0 e4l7l-mbe9 accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axis. The pos5 n*saf bao/)3abamv +ition versus time graph of thi)s5vam *ba+f a onba3/s object is

  An object is moving with constant non-zero acceleration in the +x axis. The u4lu7z *e+zgoposition versus time graph of this objectg+lu z74z*oe u is

  An object is moving with constant non-zero velocity :x mtz7m3nxqv 4a .e((o4qza nin the +x axis. The velocity z(o7( a4n4mx tn:eaxmzqq v 3.versus time graph of this object is

  An object is moving with cons5 ohwooh8 oty32)id.ttant non-zero acceleration in the +x axis. The velocity versus time graph of toy)d2h8htooit35 wo. his object is

  The slope of a positiong+ephfhg:6k9lh+0 kklk+fe- versus time graph gives

  The slope of a velocit,8 +ho/fdbjjk y versus time graph gives

  The area under a curve in an accelerat9 b83slx3bo jarhh oxvf*6b7 +ion versus time graph gives

  The area under a curve in a veh7m*1 ezqq ;/g4js stllocity versus time graph gives

  If the position versus time graph of an object is a hor6.)(avjhgby. ewxch d)+e(zy izontal line, the object i zxdacj. hge( +)he6b()v .ywys

  If the position versus z 5eq3hx2qi ,itime graph of an object is a vertical line, the object ish q3q2i5 ,iezx

  If the velocity versus time graph of an ob) x(ihim6og -zknf2:hy.a o n2mwsp3 1ject is a horizontal line, the object i: ihoz-n3h s w22m.kgiy1onxap) m f(6s

  If the velocity versus time graph of an object is a straigh c89ecsdtv--y ka9w9/fq,h q pt line making an angle of 30 degrees with the tch /d9q8ft-ycpk9vewq 9as-,ime axis, the object is

  An object moves 15.0 m nor5rpwra2*k 9 osth and then 11.0 m south. Find both the distance traveled and the magnitpr o9r 5aw*s2kude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it tawiy, 9 ;jvtrh-ke to move 12 km upstream in a river flo ,;vryhi -j9twwing 6.0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 m d. sda.b.d2jh)

  What must be your average speed in order to 08d kwx/nj dv:travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in pl p+8gc)4ahj2 hours and 57 min. What is the average speed of the runnerl)4cahj+pgp 8 in m/s?

  A car travels 90 km/h. How longn67lk)gnvnde t 40) im does it take for it to travel 400 km?

  A ly (light year) is the distance that light travels in one year. T+ sir bu -d2(k(afiol.he speed of light iss2rbo(k i.au(d +fli - $3.00 \times 10^8 \; m/s$. 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 the sv 95;+; r1gtlfep gmmiide for 4.0 s, how far do you travel during9pfltgm5rev+ m; g i;1 this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your avert3xg/1s a af( v,x:rnh:5fdak2s ky1iage3f5via1 yfxah ,sax2:ntg (dk/rk s1: velocity is

  A polar bear starts at the North Pole.q1dvii ;dj*khp)r 9b0 It travels 1.0 km south, then 1.0 km eastjd9;id0)vb1i *pkr qh, 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 speed?

  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.g+ k*x-qfxg * v(g7lbr0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip f* xbgl-7rkqgv(x+ g*takes 45 min. What was the bear's average velocity?

  You are driving home on a weekend from school a- m 3gtlmfh;x3 nm)nr-t 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 minutes. How far is your hometown fr;)3tg hnxrm3 l-nmmf-om school?

  A motorist travels 160 km at 80ar,brgaw ob8n d*/9/h km/h and 160 km at 100 km/h. What is the average speed of the motorist dbrw*,bag 9ha/o8/rn for this trip?

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What i/g id1 ht(a-7z.en arks her average speeagt17 (-i ahnr/kd.ez d for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h mm pkl2u *p5k kz,:xlq (-/tmjnorth for 750 miles. What is the average speed for the trj5x,q* l/km zu:t-lp2 m(pmkkip?

  In a 400-m relay race the anchorman (the per6y:sh) b s.utnp-k 3t,+r xcivson 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 teamby:c .n3 )s,+ rsh k-v6iupttx B runner can have when 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 11 s uo7ya z95w1/xg;zofl. The car's average velocity during deceleration was 58 km/h. What was the car's deceleration wh oaz91uow;fxy /zg 5l7ile slowing down?

  An airplane increases its spe*v6vs .ke4xcmed from 100 m/s to 160 m/s, at the average rate of xm vv*46e. sck$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the rate of 3 d8kouuy6s ws*vi 9)b$2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

  A cart starts from rest and accqh879 +yx9xxz*vj2epipzk 0kelerates 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 constant a kxx*u.i9 6pp5uu 0xqucceleratio9 puxpuk0 x*xui6.qu5n 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 5.4 m/s experiences a brf g68,lz n:ly3d (b-otnt7 jconstant acceleration ofjt38ndbr:l 6(b ogl,y ztn-f7 $1.3 \; m/s^2$. What is the cart's displacement during the first 7.7 s of its motion?

  A bullet moving horizontally to t 14 dsy6m,xo.rh j,tuud*v:oghe right (+x direction) with a speed of 349 m/s strikes a sandbag and peny4hov ,m6rs , *tuou.d1:x jdgetrates a distance of 72.91 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapult on an aircraft carrijp5rsshyb jti3 ht23qj2 *s(6er. 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 length of thebt *shhsrp3ysjt2 ( j5326 ijq catapult?

  A car starting from rest moves with constant acima.t.8vht/p/tz da) celeration 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 80c)+dp yi l1r4l m/s in a distance of 200 m. What is its average acceleration?l)l +ci4y1p rd

  An object starts from rest and undergoes uniffwl7ulgsggt:bgicj7 -h96b od2:iz23clb- 4orm acceleration. During the first second it travels 5.7 m. How far will it travel dlbb:i:gl69 l 42-cobz7g jwi2tgg7f-uhc sd 3 uring the third second?

  An object is moving in a straight line with constant acceleration. Initi fd9t2ofv .-9) u imb*(ssxwrsally it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this ti9(xsb mo.vrt)f9s-s 2 u* dwifme?

  A car starts from rest and acv1bptld*s nwf 6* e;9e 6dw9kicelerates 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 xf-vms9j3)a cat 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 turns green, a car tm87 fh4thywgiw7 bm z95;1pnp2omg4 khat has been waiting at the i15hibf2n7tgm pw;8y pz97 ow 4mmg4h kntersection 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 upw6 v; u.bp i3qyjipv8o2ard with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity ij8 3oubi.v iy;vp2pq6 s $1.5 \; m/s^2$. What is the maximum height reached by the object?

  An object is thrown upward with a speed of 12 m/s on the surface 8:6iwh 81yy,z2wtfylwosd1 5 sc,oyv of planet X where the acceleration due to gravity isfs6,1o w5 otwhy c28 i1ds: ,8vyyylwz $1.5 \; m/s^2$. 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 surfeg1duu)0fxby2 -q:aaooi,w, ace of planet X where the acceleration ,)u waio0fx qug ,a:b-do y2e1due 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 q9f:: j.ct lsyplanet X where the acceleration due to gravity is jcltq9: sy.f:$3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is ug ww 1c01wvg (holvqt(;:6dgb5sjfw 8sually greater than 0.10 s. If your friend holds a ruler between your wf gwv1j51:do6 v;8cwqbw( l0sg gt(h 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 i;.w pvgg t3 lq/2)t 9lmf;gzgkh; )nt(yakj/of 19.6 m/s. What is its velocity after 3.lt;(kgzgvk p;/gi t hn jl).gq/tf3ym9);2 wa00 s?

  A bullet shot straight up returns to its starting point i ;3)d/8pgxiz7 kcredgn 16 s. What is the initial speed of th8dx3/g dpkcr7ie gz; )e bullet?

  A ball is thrown straight up with a speed of 36.0 m/slt b+g1 h.3 g3dlby(uc. How long does it take to return to its startin.h(b u3+g1 3lld gctbyg point?

  A ball is thrown downward from the top of a building with an initial l*hlq7hqvzj +r 31derm(q /a +speed of 21 m/s. It strikes the ground after 1.3 s. How high isa1+m zq/ qrqh (v3ljr7d* +hle the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numert7vl*dd6x+*b2;ba/u x mfz woical valbx*7utmbfd2wdz+a ; 6*/lv oxue 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 straha 4j- m-5sikaight up into the air with a speed of 31.0 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 5 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 5.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocity at ,e ddoikk/(p 2t = 1.0 s?

  In Fig. below, what is the vez3eang*mu 2; alocity at t = 2.5 s?

  In Fig. below, what is th( jh.c wpt:*e 5tpje4pe velocity at t = 4.0 s?

  In Fig. below, what is the velocity at t = 5f - tax;0(ivlv.5 s?

  In Fig. below, what isjet/, -gx 1ckze-mtm3 a0 pb1s the average velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 9oc h rmu9s1j9e v+;b7.mnktteun0k7to 6.0 s?

  In Fig. below, what is .u(l w5snkwwt./i; dithe acceleration at 1.0 s?

  In Fig. below, what is the acceleration at 3.087vj sw )e)myj s?

  In Fig. below, what is the average acceleration from 0 tovr(l z*-vu:x t 5.0 s?

  In Fig. below, what is the average ugr2cg+e e4 oyz/,lkan4*cljtze9)113 ijnu acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0 st)/ezz*rmn )o?

Does a car speedometer measure speed, velocity? {speed|velocp0t)cy8s3/ t+vq kaeu ity}

  An object can have a varying speed if its velocj9oz ;g4u,hft+xgel 7 ity is constant.

  The velocity of an object can be negative when its acceleratio)e *su: h*ffd,1drf aln is positive.

  If one object has a greater speed than a second o+x4 i)ehqf*dnbject, the first must have a grea*h+i dn) fex4qter acceleration.

  Two cars emerge side by side from v1p f (dfnwnj7 qkin,,b -+pr3a 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*r/ki6sjogb lw+6/s/vyw,og in speed as its acceleration decreases.

  A baseball player hits a foul ball straight up u g5834 /r kpzqd ovdsfizy)5,w/k -p3z3owtkinto the air. It leaves the bat with a 3i4pkzd fd 3q gowrkyz z 8u/v3k-wp,s)/ot55speed 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 happening to i uz/4(za j+1fuhsy,skts acceleration, howaf (1,uss +4/ky juzzh does it change if air friction is ignored?

  As a freely falling object speeds up, w5- 4gfq1uz x-wk1 x)nhaf rdp;hat is happening to its acceleration, how doesd1)-4pu-f1 5fr xk xn aq;hwzg it change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original pocj dfus0l 13u-vq / c0,-sj1lauclf9i sition with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result be alterecca1s30 0 u,fi- 1ull9-jsvulj c/f qdd?

  An object can have zero velocity and nonzero acceleration at the same time.r:- (ws(d pvxczf +x.*umbdw5

  An object can have nonzero velocity and zero acceleratiovq5 kmysm9c 3ql(zub94bcfan* t0g/:+ yn -otn at the same time.

  An elevator moving from the second floor to the fifth floor making no stopuf +/ 2trkyr5+pvcfse *;.qxl1 nho(e s along the way has zero acceleration all the timef1+npx/fc5+t reol qrv *;y(. k2shue.

  A rolling ball moves fron738c.fn pshim $x_1=2.7 \mathrm{~cm}$ to $x_2=-7.6 \mathrm{~cm}$ during the time from $t_1=1.5 \mathrm{~s}$ to $t_2=5.2 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-4.0 \mathrm{~s}$ is at $x_1=2.3 \mathrm{~cm}$ and at $t_2=4.0 \mathrm{~s}$ is at $x_2=7.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps around a quacmgh z,p+*1h own+1h3 y xb)rrrter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.1 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away c4**2izr dkhe y0 jw8cfrom its trainer in a straight line, moving 104 m away in 10.3 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate (a)cjec8yihwk0 d z*42r* 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 frol6ifl6l+;jlwrln g4 n-)b d;vm $13 \; m/s$ to $22 \; m/s$ in 4.6 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 4w netp 16vux.g8ntx,$17 \; m/s$ to rest in a distance of 69 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of nvwq-/;3iqgago lnm t yji1:c;h 9g0:$25 \; m/s$ 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 thlsbpy ;y*tniq,h3x8*s ( iisq,k nc; )e blocks to essentially top speed abou,) yq 3 c(;s;,8b*iqiis*knx lntsypht $11.0 \; m/s$ in the first 13.8 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 uniformly f m)6e3nkzro02jnz z.qrom a speed of $20 \; m/s$ to rest in 4.16 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car xijwyw -, 16s.-gh ,wy hwu3gwleaves skid marks 92 m long on the highway. Assuming aw- 1jw y-,gswx6 gu.hwh i3y,w deceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck gis32s,w-b)rm g*miw p yat/3moing $25 \; m/s$ 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 exactxh 7d t6pq6dhp5u;yx tg5t(f6ly 27.0 min, ht5p(ufqth5d7tgp66 xxy; d 6 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?    $s$