Suppose that an object travelst-r .zl 5rvuatp19v .s from one point in space to another. Make a comparison between the displacement and tr-t 9p.av1 .t ruzlvs5he distance traveled.

  When is the average velociyi1 k7- *h+cena 4xmgity of an object equal to the instantaneous velocity?

  A new car manufacturer adwhae+ j o/.zesktrb2jo:w ( mdlme7259 ;e 6rgvertises that their car can go "from zero to sixty in 8 s". This is a descrip.rlw/ bgho ee75kme6ote (aj92mr ;zjw+ :2dstion of

  An object moving in the +x axis expe,8vs setn3 ee-45tgf3slo m,briences an acceleration of $2.0 \; m/s^2$. This means the object is

  Suppose that a car travelys3bw-qw xty(dy** v(u7a21/xki h s ring to the East (+x direction) begins to slow down as it approa ssyhivyd x bt*u-3(q1 r/(xwayk2 7*wches a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x directio 0xf)d6 gpw/ayn) begins to slow down as it approacy/pag 6fx)dw 0hes a traffic light. Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. Make a statemepi mxtyh 3zyau w9u-w;p(l8w/n, o* k(nt concerning i*8;ih,(9lwp puwna mk /ot3xzuywy -( ts acceleration.

  If the velocity of an object is zero, dj6-qgb,d; zmik v m/;zs n83vjoes it mean that the acceleration is zero? Support your answer 6j ,vn/j;m 3dzb;i vqgsmk-8zwith an example.

  Can an object's velocityzue *bpm+un.;y+ gs+u change direction when its acceleration is constant? Support your answer with an exampn+ p+;*uz+ uybe .mgusle.

  Suppose that an object is moving with constant acc elpd0enkihl*axq*7k ;7 44z79ppv noeleration. Make a statement concerningzp4 v;n77po n4d a0ip hke 7xq*e9k*ll its motion with respect to time.

  Can an object have increasing speed while its acceleration is decreasi 0x3xzj/ d a48dr;vy* c9 is5or;qbynrng? Support your answer withn5/x zb;d rri0vd*8 ojsy9y3 aq4;rcx an example.

  Suppose a can, after an initial kick, moves up alon8cc* c2mf3*bhvvvr5ruu ;oj1g a smooth hill of ice. Make a statement concerning its accelerof1uc*bvj u; m3vrr h 5*c2vc8ation.

  Under what condition i:5nzvf mh3*dbs average velocity equal to the average of the object's initial and final3dfz 5hbv* :nm velocity?

  Objects A and B both start at rest. They both accelwk8e hmjm;/ab ,9btbe ra1 c;2erate at the same rate. However, object A accelerateb;c e19h8e ar; j2m,/wb mbtkas 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 re+ o b/g9j2 b8rnoujq4b01jplzst. They both accelerate at the same rate. However, o/ng4l jbopjj+ q89zb 12b 0orubject A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of object B?

  When an object is released from rest and falls in the(x9 c-trck7s m1pk )0n-wnhwmb (h(r)hm7s xs absence of friction, which of thch07(kt97 s)rx) (- 1 ckw(xh-sbmrsh nmnmwpe following is true concerning its motion?

  When an object is released from rest and fae-u+e 71cwon4nxp (d at9zcx 5lls in the absence of friction, which of the following is true concere(uon 7c9wt4na+x1dex-c p 5z ning its motion?

  Suppose a ball is thrown straight up. Make a statement about the velocity an b86 e5ex1ocayhe ,y5jd the acceleree byx ye1565jco,8a hation when the ball reaches the highest point.

  Suppose a ball is thrown straight up. What is its accm.+tlnvkf.l+a 2-1b ynsxh9t eleration just before it reaml n+s+ hxb.9y lft1atv2-.nkches its highest point?

  Suppose a ball is thrown straight up, reaches a maxim50 nh1qcrpu ;lum height, then falls to its initial height. Mak n5hpq1;l0rcue a statement about the direction of the velocity and acceleration as the ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls tocuu3 7x 9uadfhm;oi3) its initial height. Make a state39) uo;7f iux dmh3caument about the direction of the velocity and acceleration as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air resistance. Mano qgr-)dck7,ke a statement concerning i 7,co-qd kn)grts acceleration.

  Suppose a skydiver jumps from a high-flying plane. What is her a je+iab8v7qq)ftg8x vi3r*u cs82i 9 vcceleration when she s iv8c3u2ei)8rif t*8 7abgvj+xv9qqshe reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. An ix9l twp,a)p ngdf/ ba w;-.wq5dentical 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 tpat)p 9wb,-qd;/.agf xn5 lwwimes higher does the second ball go than the first ball?)

  Ball A is dropped from the top of a building. One second later, ba 5 tivk0df* pz 3yxuju.)z15pnll B is dropped from the same building. As time pi*50yndpv uft .xp j)3zu5k z1rogresses, the distance between them

  Ball A is dropped from tija1uc589 as mj3 9 lp+mb:d pi:.qiwihe top of a building. One second later, ball B is droppembiji1p i+89w j:9l.qa p iu :5dcms3ad from the same building. As time progresses, the difference in their speeds

  Two objects are thrown from the top of a tall building. One is thrown up, anjj/ ,xktrbio65v )qs 6d8ct7l d the other is thrown down, both with the same initial speed. What are their speeds when theyc/6tk8td oxq 7,i jj6srlb v5) hit the street?

  A brick is dropped from the top of a 9n44q5ckm-w9 whdbhxbuilding. A second brick is thrown straight down from the sab-whwxn9 5dq 4k4ch9mme building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero velocity in the +x axa *lj+ c kilx(d+as7+wis. The position versus time graph ofll+iad kxacwj*(+7 s+ this object is

  An object is moving with constant non-zero acceleration i upi00uj,0xq qn the +x axis. The position versus time graph of this j uuq00qxi,p0object is

  An object is moving with constant no8/wudo4 h9jbn4va sj;u)o w 7yn-zero velocity in the +x axis. The velocity versus ti9jhw vb4) on8y o;j /4usuad7wme graph of this object is

  An object is moving b nm+x9xlvncp .(wf ;xi)u2n x,kyx97with constant non-zero acceleration in the +x axis. The velocity vers9)xx7ncx l nux ;i +9(nfkm b,wy2x.vpus time graph of this object is

  The slope of a position versus th1f 3j,la wu5bur8ih7ime graph gives

  The slope of a velocity versus time rbtkd0vgd e- )3ae jtm 0**6ucgraph gives

  The area under a curve in an acceleration versus tim ;mm.z2xqyvs8mb 9x(me graph gives

  The area under a curve in a velocity versucgrhfmv0 x, iyh747.f bnu)a*s time graph gives

  If the position versus time graph of an object is igc +gyx88ox8wne/q 961 aktsa horizontal line, the object ikx a +sc8xqt6 /iwn8gy19eo g8s

  If the position versus time graph of an object is a vertick phmeo) p3qv+n+)6)pur- lr cal line, the object is e+o+q)3pn- 6)pvph) klrmruc

  If the velocity versus time grapr3rx0r r3y( ppx15ceqh of an object is a horizontal line, the object ir 1prr5r0exxqy c(3 3ps

  If the velocity versus time graph of an object is a straight linesm:z t1.n6mfdc6k8eakd;4 e v making an angle of 30 degrees with the time ax.d :kaf z86nesvdm ke4c1m;t6is, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the distance t,f j,ce q fny)lh*;ovp7+f.pzcx9/pk rav,.,eonhf ;xpp* zq9vl/+pk cfcf )y7jeled and 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 gxiou 6 3pjp() n6w/(0dacone km upstream in a river an)u/ 6dne (p3p6ijc(0oowxgflowing 6.0 km/h?

  55 mi/h is how many m/) td5hpyc 72sim x:x)gl ez8(ls? (1 mi = 1609 m)

  What must be your average sp peuti 4g3q -r274pppseed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42.0 km) 3nl9n u3 e6lmpin 2 hours and 57 min. What is the average speed of the runner in m/m e 3lu6l3n9pns?

  A car travels 90 km/h. How long does it take for it to t .hwkekgt t3: )2d3luiravel 400 km?

  A ly (light year) is the distance that light travels in onek(4ci-qzer ( u year. The speed of ligeruzi qc-4k ((ht 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 the sidejr, q ez(/jbx+ for 4.0 s, how far do you trje+z/x ,rq(bjavel during this inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 ga,c w 5r3iy/ps, your average velop 3y5c/riwag, city is

  A polar bear starts at the Norhtwgqg xg 8pdu+pmuu 6.p 0* mxm9)8v-ch/m/e th 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 trip takes 45 min. What was tgpp8x9gm/pheuu*m/hq 8wu+)m-6vm.d x0gcthe bear's average speed?

  A polar bear starts at the North Pole. ;d 3q bmoi.r uqb*laic),lp, * It travels 1.0 km south, then 1.0 km east, then mqb pal ,*oq,c.i*;l3b u)ird1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

  You are driving home on a)2 km vc1iqio+: v.ldoqbi f+6 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 minutes. How far is your hometown oq ivk : mib6qi+2 .c+f1vd)lofrom school?

  A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the avernzyzt2:yyb p +1s/ h1y sw9:ffage speed of the motorist for thiy 1 hzswnysp9 tf:b2 yf+1z:y/s trip?

  A motorist travels for 3.07py5 f nlt:6vzr*-n;evzo jw; gt:*)i kugvv( h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the trip?n7r* j vzi:gw)5v*fet( u pgt; 6nyz:kl;vvo -

  An airplane travels at 30u2+yg-n yphv0y .(wt4e lgqzi)b; ;cd0 mi/h south for 2.00 h and then at 250 mi/h north for 75; bye;c-dvqwi (ultp4g znhy02yg+). 0 miles. What is the average speed for the trip?

  In a 400-m relay race the anchorman (the person who runs the w1z9nn7sy3 yb 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 ofzny y7s1b9 3wn the race, in order that the team A runner not lose the race?

  A car decelerates uniformly and comes to a sr5ke u* mze;s(ps/tanyeki0k ,k kl3hu.97k 8top after 13 s. The car's average velocity during deceleration was 5mneehak5.,7 3syukse zr8 ;/ 9ut(k k 0ilk*kp1 km/h. What was the car's deceleration while slowing down?

  An airplane increases++z qk +*poaky((.ari:knnxa49 w afq its speed from 100 m/s to 160 m/s, at the average rate of r+(9.z4aan+kk p (qxk*f+ in:oaqay w$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accsms;g6:a. hn jyuo 0t-elerates 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 acceleratesgr v/qt6,,tro+y vg3s 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 forq1 e(jibg c8yzluz)1q d4p,3w 10 s. It then speeds up with a constant acceleration of ) cz3e1qid ,1 ybpgu8l4wz(jq$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial velocityeya k, 4q-8l ) cwuiq -q65rotdfl8m;at1z.yv of 3.1 m/s experiences a constant acceleration of -fwq 5o 4;yda )k1taymzl qlr8 u8-iq.v ct,e6$1.8 \; m/s^2$. What is the cart's displacement during the first 7.3 s of its motion?

  A bullet moving horizontally to the right (+x direction) with a sprfl56 1o qrdmv./jo4 sl1, qmpeed of 489 m/s strikes a sandbag and penetrates a,4r1pfm5rdojlls q qo v1/6m. distance of 40.62 cm. What is the average acceleration, in $m/s^2$, of the bullet?

  A jet fighter plane is launched fv7u) 42 srh5 rkc+x4jqrdnj;q rom a catapult on an aircraft carrier. It reaches a s+xdq2r k qn)uhrjs4jv5;r 47cpeed 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 the catapult?

  A car starting from rest moves with constant acceleration9bq vj1a *bycmn5:g 8qsmsvi/ v kqegqh.37:( 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 u ct3n 1;d21w bcxk; (zfo8bwwa distance of 200 m. What is its average accelnz1cc fob3;w(k;8 ubt1dxw 2weration?

  An object starts from rest and upj(l8sj/h7b mndergoes uniform acceleration. During the first second it travels 9.7 m. How 8 l/ jh(pms7bjfar will it travel during the third second?

  An object is moving in a straight line wyj*+jqoag7+r4c* z0 +m:n)gs xg wetvith constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it moqv )* cy :7+stgox40++gezja*ng mjwrve during this time?

  A car starts from rest and arg0d * 2 imp e hmfhmm:k/4dmc0nq*d+/ccelerates 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 dr5 tim*s9pxh91 qm :xhuy 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 light turns green, a car thab +dhyrv:ez: 0t has been waiting at the intersection starts ahead with a constant 0h :vdby:er+zacceleration 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 dzl4*vcklk4u o rn(s5 c 9b7)ma speed of 12 m/s on the surface of planet X where the acceleration nvsbkl*du57z l(c o 4c)r9mk4 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/s on the surf w)gu( +fc.kveace of planet X where the accewk vg+(uef .)cleration 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 w j6x,g 38j-x4tr31ht* rfchrw0iawysith a speed of 15 m/s on the surface of planet X where the accelerationy ha-j h*r48tgicrw6jr, 0xsx3wt1f3 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 kpho598 srb x.:dhx5qupward with a speed of 14 m/s on the surface of planet X where the acceleration dpoxhq5hr:9 d k. 58bsxue to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time is usualvjnv r( p/)6ci3jx+xwly greater than 0.10 s. If your friend holds a ruler betwxn+ j6 piwj(vx/ rcv3)een 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 19.6 m/s. What is its velnj26 yhh5mb7kocity after 3.00 mkybh7h 5n6j2s?

  A bullet shot straight up returns to its star44f unuu ew1t92x-ke zting point in 15 s. What is the initial speed of the bulletfku942z-nx uuee1 4 wt?

  A ball is thrown straight up with a speed of 36.0 m/s. How 2c8je pu.n7fmc0ujm;long does it take to r802j.nue c; pufm7mjceturn to its starting point?

  A ball is thrown downwaws6smfl9zqa7d (uc/) x7q* ;s2lu irbrd from the top of a building with an initial speed of 23 m/s. It stri(zr7dl6 su/s72l9q cuas);fibm*w qx kes the ground after 4.6 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fi+mc6fuz.wu etf 4+/kd qfp*4nll in numerical valueezp*6k mf4 qnt/c+uw +.4 dfuf in the blanks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

  A foul ball is hit straight up intal7s jqg0o s.u) h6 )ckncdx,+6,du mdo the air with a speed of 29.2 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 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 ti7rhve1bn ry,x:( s 257cokqg = 1.0 s?

  In Fig. below, what is the velocity ato +lf7a4nh 7x x69qnng t = 2.5 s?

  In Fig. below, what is the velocity at t = r3 gv/d+a3fp z4.0 s?

  In Fig. below, what is cv oiq p)l-,bq0.ie 2wthe velocity at t = 5.5 s?

  In Fig. below, what is the averageyot j 6-84ppqzar+i: t velocity from 0 to 4.0 s?

  In Fig. below, what is the average velocity from 0 r )ki;rgl4p3;fnk/xfto 6.0 s?

  In Fig. below, what is the accelevsci r,9 320ayday h/cration at 1.0 s?

  In Fig. below, what is the acceleri bcmn*z8t1)1ti*ta uation at 3.0 s?

  In Fig. below, what is the average acceleration f8 s cu.z:g3qx22mqpdmrom 0 to 5.0 s?

  In Fig. below, what is the 1d53nj8 vcbg 8u2g:s/s+ylv q uvsml6average acceleration from 0 to 8.0 s?

  In Fig. below, what mmb8p; *lkbs 0,k9tl jis the displacement from 0 to 8.0 s?

Does a car speedometer measure speed, velocit.tpq*x en( nbi4ubt;yia1f *; y? {speed|velocity}

  An object can have a7xj+ /jxl+;u ynd cwo+ varying speed if its velocity is constant.

  The velocity of an object can be negative when its acceleration is se0;8 -sf6 86u uatkd4zn wedjpositive.

  If one object has a greater speed than a second object, the first mm+*kcehh; w(8r6lc dbust have a greakmdl*8bwr; c+ h6h ce(ter acceleration.

  Two cars emerge side by side from a tunnel. Car A is traveling with a speed ,t5 wep p./wmsvt*+y dof $60 \; km/h$ 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 decrease: dsr//t/ 48-.iiul2scb+ lhr xxazrws.

  A baseball player hits a foul ball ste,:rv 1p pp,zl9eca,*ora9zkraight up into the air. It leaves the bat with a speedkcz,por:z1 lvp,9*p ,ae e a9r 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 us: mcf h **oxs3xio4(object speeds up, what is happening to its acceleration, how does it change iscou3 *(fo *xmshx4:if air friction is ignored?

  As a freely falling object speeds up, what is happening to its acn/p/3pwqsd - 6pdd.q iceleration, how does it chani6p./q-s3 wdp /nddp qge if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original positione0pu6 p2l: bxs with the same speed as ix2: plu60ebspt 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 acce, qpy,p/ jaof y)6x7blleration at the same time.

  An object can have nonzero velocity and zrdk0.pvk u( p)ero acceleration at the same time.

  An elevator moving from the second floor to w0(lvphs 58 gll.jkk o3o5f7t the fifth floor making no stops along(l o7klp5hkfgs5w lt30 jov.8 the way has zero acceleration all the time.

  A rolling ball moves fromij0cagve*2e zrnj e19l1b/2a $x_1=2.0 \mathrm{~cm}$ to $x_2=-4.5 \mathrm{~cm}$ during the time from $t_1=2.5 \mathrm{~s}$ 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 $t_1=-2.3 \mathrm{~s}$ is at $x_1=2.9 \mathrm{~cm}$ and at $t_2=4.1 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight c td+f.o (( 4d1)tft4qjknwwf0 icyd,x omplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.7 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

  A horse canters away from its trainer in a straight line, mo gc p86f1*aplmving 86 m away in 10.3 s. It then turns abruptly and gallops halfway back in 4.5 s. Calculate (a) itscp1gapfl 8* m6 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 fro9y: gyn uprs6)m $12 \; m/s$ to $23 \; m/s$ in 4.5 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 frolz/2ukm 4,/mx u,c jyoxw 7exw;)ik2k m $22 \; m/s$ to rest in a distance of 63 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of1r;84 jfxzi1lk-bc2ij 9tymw $25 \; m/s$ 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 the blockl3t.bb9n2kf 9utdhx5 s to essentially top speed aboutf.3ndubxtthbl59k2 9 $10.3 \; m/s$ in the first 10.1 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 a sp vic, ulk(m:.4igs l8mkn;x(reed of $19 \; m/s$ to rest in 5.74 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leavesk2y7,l39x8x pt acvctas /-y t skid marks 92 m long on the highway. Assuming a d ,vy t/spxa39ac8cy2k7tt-x leceleration of $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck goipdbjeh*+ c:qp( ..lbxng $25 \; m/s$ 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 lessat3ya*w(qi f*t /jx/f than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then accelqi f/f/* *3yax(jwtaterate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$