Suppose that an object travels from one point in space to another. Make a cwlz l 5+cv 6bo/ov6j(zomparison between the dis ov( l5bwl+j66zvocz /placement and the distance traveled.

  When is the average velocity of an objecbuv34y e7:m)s 9hcsarjs *5w0y izb .ut equal to the instantaneous velocity?

  A new car manufacturer advertises that their car can go "from zero ts kz , qlw625car8 ntwe*p9y7bo sixty in 8a8r tkcsy 29b we56*,nwlqz p7 s". This is a description of

  An object moving in the +x axis experiences an acceleration o,rxjkgu3p /uy 5xps 22f $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to u-) ,sgio49 3fsmiskkv;/j brthe East (+x direction) begins to slow down as it approaches a traffi4 ,jb3 v;mgf)os/kiru s9k-sic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) b negr(t-d*kcm 3:r(,yhy 8 tbpegins to slow down as it approaches a traffic light. Make a statement concerkgy(,t rt3:nb8- *rce py (dhmning its acceleration.

  Suppose that an object) yxeujtio g .z.j 6ab:/j**nt is moving with a constant velocity. Make a statement concerning its acceleratio*.ex ju:atz* n/)oj .b6itgj yn.

  If the velocity of an object is zero, does it mean that the acceleratioiyn- d,q+ :gv8zk3vu vn is zero? Support your answer with an exampv -u+8zqvdn:vk g 3i,yle.

  Can an object's velocity change direction when its acceleration is constaxrcklt9m 7on27i3qx8tek7d + nt? Support your answer with 2le+ t97imtkxc8x qnk r3do 77an example.

  Suppose that an object is moving with constant acceleration. Make (oe 4:weo p- i*irr:zca statement concerning its z :i: e(o-ri4r*oepwcmotion with respect to time.

  Can an object have increasing psj fop::x1reh-g7 0qgw ,ut1speed while its acceleration is decreasing? Support your answer with an exaw,1rp p0e7x- tjqo: ggsf1 hu:mple.

  Suppose a can, after an initial kick, moves up along a smooth i0v0l3i3tgpnvf8 nm5n (/n sos4 sl6fhill of ice. Make a statement concerning its acceleration.6v0si8p/nv i3 m (nofts4 s03n5n lfgl

  Under what condition is average velocity equal to the average of the objez)*rjihtth ( /ct's init t(*/hrizj)htial and final velocity?

  Objects A and B both start at rest. They both accelerate at the same reo12chg9z sie) d5:zq ate. However, object A accelerates for twice the time as object B. What is the final speed of object A compareoqe:z9g z25d cs1ih)ed to that of object B?

  Objects A and B both start from rest. They both acc7fiya t 75xtcasb+-n3elerate at the same rate. However, object A accelerates for twice the titbtiy77fca3- nxa+s 5me as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from re8,e *ji3 (d(bkhd wmijst and falls in the absence of friction, which of the following is true concerning( 8*eh w kj(ibm3,idjd its motion?

  When an object is released from rest and falls in the abzz9k) 5bi) pph xz;c,b(ib na5sence of friction, which of the following is true concernin ; c)xip bnbz5 i,)5zp9z(ahkbg its motion?

  Suppose a ball is thrown strigr8y2st.o c)ctr ,r, aight up. Make a statement about the velocity and the acceleration when the ball reaches the 2s rtci,8ry)or.gct, highest point.

  Suppose a ball is thrown straight up. What is i)3cp7, wkyr3 *lr0vvhyt0a o cts acceleration just before it reaches its hig0,rk vlpat3yr3w h*co vc 07y)hest point?

  Suppose a ball is thr t-ksmy g14ok,own straight up, reaches a maximum height, then falls to its 1,ks4-y gmo ktinitial height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a m5uw8al p xg3o/aximum height, then falls to its initia5u3wl8a /pg oxl height. Make a statement about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence ofp f-ajx(h q.ej/ ,6i +f7m+y fqvkzv*i air resistance. Make a statement concerning pxvq(,.zi/m6* -ffkv+7hj qf+ i jeayits acceleration.

  Suppose a skydiver jumps from a high-flying plane. )e qebu-,yaou6w2d8b What is her acceleration when she she reuue2 ,o-ewybqb6a8d ) aches terminal velocity?

  A ball is thrown vertically upward with a speed v. An identical secoq2uah hnl .g*h+**pidfive :(4mgeu3 nd 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 times higher does the second ball go than the firsi( v*.i34leg* gh*ehm+nduh2af pu q:t ball?)

  Ball A is dropped from the wjwhh( j w/v +nkm2x*grf 8:7qtop of a building. One second later, ball B is dropped from the same building. As time progresses, the distance between qnf+wg7(28*khmwh r j w:/xjvthem

  Ball A is dropped from the top of a buildin, ny+.( hqkvtd t.r:gkg. One second later, ball B is dropped from the same building. As t .ntd :vrt(y .gh,k+kqime progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is throw+f*jzt7gez;e *kvd, sn up, and the other is thrown down, both with thz ek *tgfs7dj, ve+z;*e same initial speed. What are their speeds when they hit the street?

  A brick is dropped from the top of a building. A...shoi 3a4qfq/e mbggj qa5 - second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare thf/qeims .aa.4jqqg .b- 3ogh5e accelerations of the two bricks.

  An object is moving with constant noxj .gu fye, ba-tvr ;i0-/x:pxn-zero velocity in the +x axis. The position versugerxu.ip xvtfx;y,j-b -0:/a s time graph of this object is

  An object is moving with constanhw6 +ptmm 4lo;t non-zero acceleration in the +x axis. The positithw lo+;mmp64 on versus time graph of this object is

  An object is moving with constant non-zero velocity wk ,z(f7m9 c qcuq3-bk p,wag8in the +x axis. The velocity versus fu8 gqm, wb7awq,(z93ck-kpc time graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis. The vel;pxwcyt w d :l7:ye053c sf6utocity versus time graph of this objecwypt;x:0ut3 dw yec: 76sl5c ft is

  The slope of a position versus tixb+y hk3t68cmr r (rh5me graph gives

  The slope of a velocity versus time graph go,5-v iile:r 8*g avfz i9mcb8ives

  The area under a curve in an acceleration verg8(/ l q nhkdswvni,jov/:h88sus time graph gives

  The area under a curve in a velocity versus timen7 bx81a/rel;yd5y lg graph gives

  If the position versus time graph of an object is a horizontal line, 7 mr;yp*u)exq the object ism7 pyque;r)x*

  If the position versus time grapk, zts8 + tch4 o*ho,dt4ceo5uh of an object is a vertical line, the object isootkdhcce,*8,s z t5ho+ t4u4

  If the velocity versus time graph of an object i;itp+ i qpt01is a horizontal line, the object q;pi0i+itp 1 tis

  If the velocity versus time graph of an object is a straight line m p7moe/o3e *elaking an angle ofo7eo* lmep /e3 30 degrees with the time axis, the object is

  An object moves 15.0 m north a;zeuf4v (-n ixpm xc70nd then 11.0 m south. Find both the distance traveled a7;viu cf 4nez-xxp(0mnd the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long will it take to move 12 km 5btv i+s jfw+ pjc,3m ,-/xj/)tocgxz upstream in a river flowing 6.0 +,mspcxg-/+5 3/z,wij ) btjtvojxfc km/h?

  55 mi/h is how many m/s? (1 mi y5rreeuv/:8e+x 8rx px 7m7un = 1609 m)

  What must be your averaz t6a; (ex mu17 wxbxyr-orr33ge speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57*xfox-h3 ( selq+cin0 )pxul 8rkj4er p9f,9l min. What is the average8 i+4pc 0*r, l l xjp-3qlrxe9fk(hsoxf)9 enu speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for art1; .tc z: n9m2fzw38gk, 2rhunzpi it to travel 400 km?

  A ly (light year) is the disd+u 5mkknaln al z,., ,5.u-gkzhw* obtance that light travels in one year. The speed of light izl5z.kl nkb mn h+-wa.u5,du,ao ,gk* s $3.00 \times 10^8 \; m/s$. 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 side for+;f ocqkbc 97fp;xs-b 4.0 s, how far do you s;kxqcp9 ;ocf+-bb f 7travel during this inattentive period?

  If you run a complete loop around an outdoor tro o06m)fme +dyack (400 m), in 100 s, your average velocityedo)+my06 f om is

  A polar bear starts at the North5(hgj v 4euy3tlkts6sp4c)6r 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 st4lskv u 3sc(6r5tg46p ejhty )arting 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 soyxh8-+mprhtup*qg +xsd -lpbw* ( *9nuth, then 1.0 km east, then 1.0 km north, then 1.0 r xdb*(lu8 h +xpm-*g -pyptwq*9 sn+hkm 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 school z9ryq4)q7nukk :1 fdpat 55 mi/h for 110 miles. It then starts to snow and you u1z9)pqd7 yq rk4k: nfslow 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 and 160 km at 100 km/h. h ( r:bl/cp ey t8m5cd*ml;wy( What is the average speed of the motorist for this trip?y(e5:8bpl ct /r y lm*(;dcmwh

  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 yx:;u 2yza;zhpcf3o:c.t h m; km/h. What is her average speuy;: op;zy3 .h c;a2c fthm:xzed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 21by 7n8xf5v.inyp l) ylx( 9 wtk7d:xg50 mi/h north for 750 miles 7xkybx8.ilwn )p y5ld(yvfgx: t97 1n. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the peg2u9rcdzit:8t -iup8 rson 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 hg z98iu tcp2u:dt -ri8ave 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 stopoasnt; bzja7*az2h1* after 10 s. The car's average velocity during deceleration was 66 km/h. What was the car's decez;bt z a1aa ohj*s7n*2leration while slowing down?

  An airplane increases its spemoqm5 2glq. 4t4bqip7ed from 100 m/s to 160 m/s, at the average rate of blqtim4 . qq25mpg47o$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/-g/yyzi g-p ux8 xjy/.p:5rh(dm 2hclh 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 at7/5z jmk+nw od7; 1bo.nco0uqw( tjrccelerates 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 cons ktthi7 ocr/ vjg/q746tant acceleratio6kjt 7q igcvrh7/o4 /tn 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 3.4 m/s experiences a constant acceleration xvr2.;1gfr/,; 0euf sryzk sk ofu ,0rrfxy .s;e zs2rv;f1kgk/ $1.3 \; m/s^2$. What is the cart's displacement during the first 7.4 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a speed of 327 mbx1c 21x d8kae/s strikes a sandbag and penetrates a distance of 25.94 cm. What is tha1x18dcke x b2e average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is lswndy.qav / (, o/ne2; aaup:zotp m+2aunched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and thiqa w.y;p,tnp2:z n(a+ao/ s2oe/uvmd s requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves withog1c6tw o* npfj 755qc 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/s4wer.7l 9b eyafs75 hj,wk5ic to 80 m/s in a distance of 200 m. What is its average accele7 s559 ykrcfl,4hjbi7wee .awration?

  An object starts from rest and4cuoywr/ng b,p5k5 y 3 undergoes uniform acceleration. During the first second it travels 5.2 m. How far will it travel during the third sec34, c55yr/wky buogpnond?

  An object is moving in a straight line with constant acceleratio7uut9di:yt; ci2m nj*n. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far ditc :d u;ij79numt* 2yoes it move during this time?

  A car starts from rest evpfz:)9 o6ky and accelerates 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 a dhh w6(fm/;bw(w z.qet 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 n1 50i n3d;xfafp8 uekturns green, a car that has been waiting at the intersection starts ahead with a constant n8p1d5fkeiu n f;x3a0 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 h9srn11x4rjv et0s7 i:f6amasurface of planet X where the acceleration due to grams19f r:7 anjta4xhers6vi 1 0vity 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/s on the surface of planet X whvh.q+wg:s8d0 pytr )a ere the acceleration y8gpr tad0 vq)s.wh:+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 spe5r sk7nct a(c.ed of 15 m/s on the surface of planet X where tnsckra tc 5.7(he 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 upward4 w4gntbo 2yr;p8 n8ovny35qr with a speed of 14 m/s on the surface of planet X where the acce3; to 4pr52 r8voq4yn8 nwynbgleration due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usually greatex8cj f jy2ji/n c-ryz,q2 cb,+r than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to r8jy2zb cjiq,+/ fxn2 y,c-cj fall before you catch it?

  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after 3qx3xbpu 6 *xhmaj 8; kte)8hk,.0x ax m* ext;qb86jh8k,p) khu30 s?

  A bullet shot straight up returns to its starting point in 1ub7v)uxc6 tr5do +l)p3 s. What is the initial speed ofbu+ 7op6vd)ct5rul x ) the bullet?

  A ball is thrown straight uybv8 .ywg4kxh+q jt3rqw0-)(tes0 zj p with a speed of 36.0 m/s. How long does it take to ret wzk-ywx+(h ybr qt s03v.jg0qet8)j4urn to its starting point?

  A ball is thrown downward from the top of a building with an initial * sk ys n);iw2:lju9vfspeed of 20 m/s. It strikes the ground after 3fli ;2:w9 jn yuv*)kss.9 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numerical 6qflus, (mqqrk6 4o+kvalue i64 ufk6mr +qq,(qsl kon 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 air with a s3d w+uzy5 b9nmu80deupeed of 40.8 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 3 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 11 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 11.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velocxb(61frjqxg z3w o.58p twq d6ity at t = 1.0 s?

  In Fig. below, what is the3trjouks(0 d7n nt)yx2.) abw velocity at t = 2.5 s?

  In Fig. below, what is the veloc-,pt )r5vg uhfity at t = 4.0 s?

  In Fig. below, what is the velocity at t 3 tg 1edvgrmt85.xwik 1rs2i 3= 5.5 s?

  In Fig. below, what is the average velo qdx1f24l u fcuzg-:8 dvi3bg*kki,6w city from 0 to 4.0 s?

  In Fig. below, what is the average*yq8; c u rxxli.n)vj- velocity from 0 to 6.0 s?

  In Fig. below, what ise2+/it8 t2 -nnny f rc)d+y cpv+mpom, the acceleration at 1.0 s?

  In Fig. below, what is t47 k5cu 1enwuz5i0d o*gj 0ywkhe acceleration at 3.0 s?

  In Fig. below, what is the average acceleration wu69 .nlet:gafrom 0 to 5.0 s?

  In Fig. below, what is the averafbyk j(/a d25*, vpvgjyem 1,fge acceleration from 0 to 8.0 s?

  In Fig. below, what is the displacement from 0 to 8.0 u qx i.nsvwhm .i7 .fv:t0)ov8s?

Does a car speedometer measure speed, cx 9 7nqlc y(ljw8*gj*velocity? {speed|velocity}

  An object can have a varying speed if k:x7xx flm*t;-3r agl its velocity is constant.

  The velocity of an objectay.-svp3w f 86f;x zxv can be negative when its acceleration is positive.

  If one object has a greater speed than a second object, th6emcq kwk/r, 9e first must have a greater accmk9wq 6r e/kc,eleration.

  Two cars emerge side by side from a tunnel. Car A is traveling withels qqwp; 2kdai5*,mp 0m97pc a speed of $60 \; km/h$ and has an acceleration of $40 \; km/h/min$ Car B has a speed of $40 \; km/h$ and has an acceleration of $60 \; km/h/min$ . Can A will pass car B at the instant they come out of the tunnel.

  An object can be increasing in speed as its acceleration decreq(ecee 1):ro xases.

  A baseball player hits a foul ball straight up into the air. It leavesh p w1qj d8vxynijfp9ne0df8g9*+. .x the bat with a speed n1.g8+ j q enwyjd.09p9*pfixvfdh8x 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 itis*sngd 2i h;ic 8y8,r m)xgu6s acceleration, how does it change if air frictiocisyism)nx8 h gdi8,2g ;u*r6n is ignored?

  As a freely falling object speeds up, what is happening to gy13a9 m-,b fs(sdifwits acceleration, how does it change if air frictifib9 fsg(s dwa3m ,y-1on CAN NOT be ignored?

  An object that is thrown vertically upward will r(g( rzuq 8hwj6ctw/ td k4)4,c4bclodv (l,cm eturn to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this resul4bkh( cjl() c,4twql u dw4 zrmcvct,/ 86do(gt be altered?

  An object can have zero velocity and nonzero acceleration at the same ti7b )b7kdhpvqgr -(,dkme.

  An object can have nonzero velocity and zero acceleration at the same time.) k*kkw go1i2+kdoqn3

  An elevator moving from 4pi6uusrdr,ng p0r hv* l134f of) )lij35vr wthe second floor to the fifth floor making no stops alon*fh6ij5p pfu)1r n 0 3dorr,3 v4gus4rl )wvilg the way has zero acceleration all the time.

  A rolling ball moves fi;0gda y,0ua ,6zxqxn ;q v0ssrom $x_1=2.6 \mathrm{~cm}$ to $x_2=-6.8 \mathrm{~cm}$ during the time from $t_1=1.3 \mathrm{~s}$ to $t_2=5.4 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.1 \mathrm{~s}$ is at $x_1=3.0 \mathrm{~cm}$ and at $t_2=3.1 \mathrm{~s}$ is at $x_2=7.4 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight complete laps aronat6n ,jjc, :uund a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.4 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from itx 92ez8i iey.i:ldo,d s trainer in a straight line, moving 111 m away in 9.8 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculady2i 9e,ile :.oi zd8xte (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 m:t ks.nfihbz(w 0,2 u1dnh0r $12 \; m/s$ to $23 \; m/s$ in 5.4 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 fromvwj, k)du3 pac h;a6;i $22 \; m/s$ to rest in a distance of 84 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speq+ 4zd zreh:s.c--p oied of $32 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.4 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter s.iig8 kk8.3bj:kgs q can burst out of the blocks to essentially top speed aboutgibs:3sq jgk ..k88i k $10.2 \; m/s$ 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 uniformly from l/cj9 z3bby-74 m.4 p tkia qf-vy;13vrvnura a speed of $19 \; m/s$ to rest in 5.68 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. Asrm e*3yd4c- ofsuming a decelera yf43 c-*omerdtion of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goingo1nd*13 g br/ei.lkkr $25 \; m/s$ 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 thxv ,g hrwoz4)9/,m nxqe 10,000-m run in less than 30.0 min. After exactly 27.0 min, there are stillx zorv/4ghm,)qwn,9x 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?    $s$