Suppose that an object travels fro bzvw9rl ,*w(gm one point in space to another. Make a comparison between the displacement and the distance(rw *z vlbwg9, traveled.

  When is the average velocity of an object equal to the iim)4xa )ea mie2/: xiw6 wurn1nstantaneous velocity?

  A new car manufacturer advertises that the w3v/gky;k gt,ir car can go "from zero to sixty in 8 s".k3/ wvt ggy;,k This is a description of

  An object moving in the +x axis experiences an acceleratio f t:k5ek-kgdo* ;t9fen of $2.0 \; m/s^2$. This means the object is

  Suppose that a car traveling to the East (+x direct91 9f)cp qgq 1hl.o.j.k/orlo; juxs tion) begins to slow down as it approacc1r9;lug j)ko lhxotqpj.s.o.fq 91/hes a traffic light. Make a statement concerning its acceleration.

  Suppose that a car traveling to the West (-x direction) begin79n djl:z:etos to slow down as it approaches a traffic light. zo7del: t:n9j Make a statement concerning its acceleration.

  Suppose that an object is moving with a constant velocity. - 972uoq ustnmt2l5b d Make a statement concerni5t7us22n9mlot- duqb ng its acceleration.

  If the velocity of an object is zero, does it mean that the accu+3 1u-dv:ffi c 0lbageleration is zero? Support your a0-gdifa1l f: u3uc v+bnswer with an example.

  Can an object's velocity changeuxr6d.i 4q7;jr/bumx direction when its acceleration is constant? Suppx qrb/; jd ru64xmi.7uort your answer with an example.

  Suppose that an object is moving with constant acceleration. Make a s*cp /k l6. ipwhzdk/(jtatement concerning its motion(kzki/p*d6cj hw/ . pl with respect to time.

  Can an object have increasing speed while its accel;3f gww.rq5l*lxl eqq 3:t) bweration is decreasing? Support your answer wt5fr:)3qqwl 3w.x; bew lqgl*ith an example.

  Suppose a can, after an initial kick, moves up along a smooth hill of ice. /-hbu yik u5r)+v hy)gsjpp-/Make a statement concerninpyyug-j -ps/u5/rh h)+ ib )vkg its acceleration.

  Under what condition is average velocity equal to the averagedxf mp+)p6u8l of the object's initial and final velocityl+ m )f8uxpd6p?

  Objects A and B both start at rest. They both accelerate/p7znommw ed5831lx igvu)0 *a5h n jt1iys3m at the same rate. However, object A accelerates for twice the time as object B. What is thg 15 ul8s oj i5d *mnx31/)tpwyenhv 70m3izame final speed of object A compared to that of object B?

  Objects A and B both start from rest. They both a:zne,i 9q*;a c ;sdzafccelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled,*:qf;;ansaz ecid z9 by object A compared to that of object B?

  When an object is released from rest and falls in the absencesrvi+ dr w05 gcq;x ft1 om7x8cf9),ps of friction, which of the following is trprix7s0s95 woqfdf, v1 8 rc; xmt+c)gue concerning its motion?

  When an object is released from rest and falls /jy :.5lsn4jn y6 xismin the absence of friction, which of the following is true concerning its motny msixl6j4 n.:5sj/yion?

  Suppose a ball is thrown straight up. Make a stat 5d (mnmu6kwd:r58e yxement about the velocity and the acceleration when the ball reaches the highest n(xme :6kudy5m85dw r point.

  Suppose a ball is thrown straight up. What is its accuce7.;4-oc ovh b tk8eeleration just before it reachekbhevc -4e ouot.8 7c;s its highest point?

  Suppose a ball is thrown d nmj w4ylw 5c5-3fu fhu72e2dstraight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as tu5c24fw2eu -fn dylw3j m5d7h he ball is going up.

  A ball is thrown straight up, reaches a maximum height, then falls tv0t tbu;y0l2) 0cwmxc o its initial height. Make a statement about the direction of the velocity and acceleratiotvt0 ul;2cy c)00wmbxn as the ball is coming down.

  Suppose a ball is thrown downward in the absence of air t7 nfrm)o3fy a6adnbrf-2 ,(oc: )ubu resistance. Make a statement , n2bbyouffc)rmfdt)no-7 ura63: a( concerning its acceleration.

  Suppose a skydiver jumps from a high-flipp)+z w5-im lying plane. What is her acceleration whenwp - impl)z5i+ she she reaches terminal velocity?

  A ball is thrown vertically upward with a speed v. And rjvwj 5::vj5 identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum heighjdj:j55 w: rvvt 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 top of a building. One second later, ball B ds4e+8sn+u x:q s4r(iu,yduby+f p y(is dropped from the same building. As time progresses, 48sdbx((+:fdure+ qu,py iys 4s+un ythe distance between them

  Ball A is dropped from the top of a building. One sejy boe-;y0yi cqfrs+: *9 8ycgcond later, ball B is dropped from the same building. As time progresses, the defor-:; j8cy ys b*iq ygy9+c0ifference in their speeds

  Two objects are thrown from the top of a tall buikzt0 j34z 3lgilding. One is thrown up, and the other is thrown down, both with the same ini04i3 3jkzlgtz tial speed. What are their speeds when they hit the street?

  A brick is dropped f28wt,st5p x 2;cdabeyrom the top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistan8ayts5; btde 2pc2w,xce. Compare the accelerations of the two bricks.

  An object is moving with constant non-zero veloc z8w8,/5b uo2wyvzr r plx-bw)ity in the +x axis. The position versus time wpby5,)- rbzlz8w/xo2 v ur8wgraph of this object is

  An object is moving with constant non-zero accele gw nai g(wuv/.v 0u39mx*pn+jmv,zw +ration in the +x axis. The positio03ww*vn (np9+amvumw/+u g ,ix.z jgvn versus time graph of this object is

  An object is moving with constant non-zero velocity in the +x f6. s,nw*hvj)6s,u5ra c hmntaxis. The velocity versus tins r.*fu5m,)s6 wv ah,jc 6nthme graph of this object is

  An object is moving with constant non-zero acceleration in the +x axis.y+k37b.ob1 uwlovn -nckrq66 The veloci6boy+ kwn17- v3.ukbqlcrn o6ty versus time graph of this object is

  The slope of a position versus time graph kd xgaje(dvub(,y4ue.6tbc4oiv a09 o +2p+jgives

  The slope of a velocity versus time graphor 2u1*t 5segg gives

  The area under a curve in an acceleration versus time grapmrsn)ifnq ms2m:3:;n h gives

  The area under a curvi f hckt3.ceb mps de1v4)3+1ie in a velocity versus time graph gives

  If the position versus time graph of an object is a horizontambt )p .nkyp2u; ezc.u c9(7xjg;l )tal line, the object i)79ptuup ;b zccm )e2al j yg;.t(.nxks

  If the position versus time graph of a o5*f 7r- nyq. hl3+xk:ebluxgn object is a vertical line, the object is- xy7nuolkhq r:glexb .+ *53f

  If the velocity versus time 91qyiu8v6.h lkcv0fc graph of an object is a horizontal line, the object ihc8yfq.lvv1 9iu60k c s

  If the velocity versus time graoy lt)4)rvq) cno4j: 3sjpkq9 ph of an object is a straight line making an angle of 30 degrees with the t9q 3cv:q4rsyotolnj)) j )k4pime axis, the object is

  An object moves 15.0 m north and then 11.0 m south. Find both the di 6 m:5p6qrlhxdryfb(4 stance traveled and6f54m x6r:hqpy (drbl the magnitude of the displacement vector.

  A boat can move at 30 km/h in still water. How long wikz pmji -m8fw08k .tw4ll it take to move 12 km upstream in a river flowing 6. jz4.-m f08w8mikkp tw0 km/h?

  55 mi/h is how many m/s? (1 mi = 1609 m)pt cv sw(; o,:splf2gn 4vht12a8isr,

  What must be your avem l*y v1 q7e)lo;mosv2rage speed in order to travel 350 km in 5.15 h?

  A runner ran the marathon (approximately 42 *av- z-iyn0fe.0 km) in 2 hours and 57 min. What is the averagv*0zi ay--en fe speed of the runner in m/s?

  A car travels 90 km/h. How long does it take for it*;geg ;ks0 hjz to travel 400 km?

  A ly (light year) is the distance that light travels in one year. The speed o-r8- pnp 3vumff light un8pv-mf-r3pis $3.00 \times 10^8 \; m/s$. 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 z0vgb ;bsw (9av.;zjd-shcu* you look to the side for 4.0 s, how far do you travel during this 9zd.s bvzuhcw;b0;s*vag j-(inattentive period?

  If you run a complete loop around an outdoor track (400 m), in 100 s, your avers szs)8o/mbb4 p*v2ky fkqt/, abms /z4fybos p)st8 * vk/,2kqge velocity is

  A polar bear starts at the North Polys 5,d,qcpku1ud ngjf)t1+/ -y ain8z e. 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 mi1cyu,i1+ d kug/j t a5sy-8znqp)nf,d n. What was the bear's average speed?

  A polar bear starts at the g khf)8 w,qtcs*o5;;qypnz )k r guqas(/g5, nNorth Pole. It travels 1.0 km south, then 1.0 km east, qq*r gqykwz;)5)(sn8os p cnfu;hk 5g,g,/ta 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 velocity?

  You are driving home on a weekend from school at -f1 vt8ydgda,l)zy 4j 55 mi/h for 110 miles. It then start8d4 vtal,- djygfy)1zs to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from school?

  A motorist travels 160oeg,6iwcy67 h7, b bih km at 80 km/h and 160 km at 100 km/h. What is the average speed obh,6 i c7gehi,oby67wf the motorist for this trip?

  A motorist travels for 3.0 d 8;auw /x6x* zzj*bh9gyuv1ah at 80 km/h and 2.0 h at 100 km/h. What is her average sp 89y*x1b vhz/j;zw*gx ad6uuaeed for the trip?

  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mcfwh)xx (+ zj1i/h north for 750 miles. What is the average speed for the trip?w ) zx1jch(f+x

  In a 400-m relay race the anchorman (the person who runs the /8juca5rab. m last 100 m) for team A can run 100 m/.8cu5ba ja rm 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 runner not lose the race?

  A car decelerates uniformly and comes to a stop after 10qrcbof2+zf)+jqn(qat2 1 /qzpjc a 3* s. The car's average velocity during deceleration was 47 km/h. What was the car's deceler3a qc+jo/pq1zr zf+(*2j2cqntqabf) ation while slowing down?

  An airplane increases its s0(z9+p9 b exnz ;h wys/ae1xmepeed from 100 m/s to 160 m/s, at the average rate of 9e/px;x1+webzma z ( s e9y0nh$15 \; m/s^2$. How much time does it take for the complete increase in speed?

  A car traveling 60 km/h accelerates at the ra-ib6niferp5xg)1/ akv+ d ,ha te 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 an/ 2p cc:dxkn.idtlv ;wn1t5p -d accelerates at $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

  A car travels at 15 m/0* d7pqqi0hu0ge g8 tfs for 10 s. It then speeds up with a constant acceleration of 0fgdgi*pue t0q0 7hq 8$2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

  A cart with an initial/t aw+use:,ig velocity of 3.4 m/s experiences a constant acceleration ofsgaitw u, +:/e $4.4 \; m/s^2$. What is the cart's displacement during the first 6.2 s of its motion?

  A bullet moving horizontally to the right (+x directi ;- 6:8ytrliwwqx76 -lve; vdcq o6puaon) with a speed of 207 m/s strikes a sandbag and penetrates a distance of 55.65 cm. What is the average accelerap7o q6:x-6r6 uvvwq-ad;t lc;liy8w e tion, in $m/s^2$, of the bullet?

  A jet fighter plane is launched from a catapulwx v. 6+9qru27huxx9vdzq 5gst on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuminv uqu+.79z6dv5rhqxx2 w9 xsgg the acceleration is constant, what is the length of the catapult?

  A car starting from rest moves with constant a99d;jc)p ouerw( w- hdcceleration 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/uy2g a+ ffc/1r8sds +w8mixx6s to 80 m/s in a distance of 200 m. What is its average accefsfw 2 xa y/xm6u 1rg8dc++8isleration?

  An object starts from rest and undergoes uniform acceleration. Duri,o uufkj6zix/ e s a3d)4auo70ng the first second it travels 2.2 m. How far will it travel during the third secesaux uik46, 3fz oj0aou7) d/ond?

  An object is moving in a straight line with constant acceleratiohs(c/d t .o ;bgt-hc3mn. Initially it is traveling at 16 m/s. Tth(g ;ctm3h-sb.d/c ohree 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 8z() kt)c-p/dqvs xixat $3.0 \; m/s^2$. 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 cet27fr;1 qbw lan 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 that has been qv pwpls.ky-5/dns*7 v:th g.waiting at the intersection starts ahead with a cldy:twpqsvv g.n *5kh- s/7p.onstant 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 ,/cr mw3nv 2t5. 9xdd x4xxpvyspeed of 12 m/s on the surface of planet X where 3tn9w2 c 5xx rdpx/dvyv.m4x,the acceleration 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 surface of l.b :rz *dc4zdv lm41dplanet X wherdcld z4 .4zm:rd1v*ble the acceleration 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 upwa8mbp+8z hhd1bpotg:w j1n o(0rd with a speed of 15 m/s on the surface of planet X where the acmz (dh1+nwojbt: bh 10p88po gceleration 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 u6 .wmz0x -xdjcpward with a speed of 14 m/s on the surface of planet X where the acceleration duex j m06xz.-dcw to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

  Human reaction time b 0io s2x;cne*is usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far ca ; 2s0nxo*becin 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 it bk3fkjc6fz2z-clmlt91e9s 2s velocity after 3.2fc 1lbek6s lmfk993z 2z-tjc00 s?

  A bullet shot straight up returns to its starting -u9.5.t *aen-vgguo :widahl point in 17 s. What is the initial speed of the vl.- .dati :ughgu*woe95-an bullet?

  A ball is thrown straight up with a speed of 36.0 m/s. Honj0d ;z-v (jytw long does it take to return to its starting po0d(v z;nj-tjy int?

  A ball is thrown downward from the top of a building with an initial speed tb-jccrd ;pef8(m nr44 5scb, of 9 m/s. It s4,mrccdbr 5snt fcj-pb 8 ;4(etrikes the ground after 7.0 s. How high is the building?

  A ball is thrown straight up with a speed of 30 m/s. (only fill in numerical vo,j)tu ql 5a8zalue 5lj oaut 8,q)zin 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)w+xde u . z6 azy0;cegke80ft2q,w mz with a speed of 20.0 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 10 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 10.0 m above the point of contact a second time.  (数值)  $s$

  In Fig. below, what is the velo2tjy .yqph *l. 4ns;opcity at t = 1.0 s?

  In Fig. below, what is the velocity at t =:oo( ae gi8*86sepoky 2.5 s?

  In Fig. below, what is the jmn) 91shzmhx9-g ,fmvelocity at t = 4.0 s?

  In Fig. below, what j. y,x6a*szoaz4m*u *.orwnfis the velocity at t = 5.5 s?

  In Fig. below, what is the avera t2rp)km-s-lzge velocity from 0 to 4.0 s?

  In Fig. below, what is the a),)m55ukrn v7fv *e ojm/ (p8fb7cwk 7uc qslnverage velocity from 0 to 6.0 s?

  In Fig. below, what is the acceleration at 1.0 smcf(dq)f5r1 pjset7+ pp2d .s?

  In Fig. below, what is th)l/bnw-0 yk,*h xqntoe acceleration at 3.0 s?

  In Fig. below, what is the average acceleration fromvq4cilr s+ 0(h 0 to 5.0 s?

  In Fig. below, what is the average acceleration from 0 tz8o* fev hb -o*jboaq+2c2m ;uo 8.0 s?

  In Fig. below, what is the displac6 , i9kza7bobuement from 0 to 8.0 s?

Does a car speedometer measure speed, velocity4 qb.oq1s6b vv g eghjn*8*8dg? {speed|velocity}

  An object can have a varying speed if i(x /pce.dl8urts velocity is constant.

  The velocity of an oplosn :cf /+)kn it:z5bject can be negative when its acceleration is positive.

  If one object has a greater speed than a second object, the first 09z6/vjhu byv q 2ro4xyr. fp6must have a greateruyvxb0p/rz4f.rh2vy q 696 jo acceleration.

  Two cars emerge side by side ca2n4 dk1.jpgoh .0x5ukd-k i from a 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 in speedr.7 wl(j (xb) bdlmssi+uz6,lhm(g -x as its acceleration decreases.

  A baseball player hits(at9xh:+,5ayt k slga a foul ball straight up into the air. It leaves the bat with a sp9as a xhy,a+g:tt l(k5eed 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, whfmvy5fvy+ 8(g at is happening to its acceleration, how does it change if air friction is ig+f8(my5vfv ygnored?

  As a freely falling object speeds up, what is happf 5ba40 bnzh.tening to its acceleration, how does i.a5 4 bbzf0ntht change if air friction CAN NOT be ignored?

  An object that is thrown vertically upward will return to its original cv* ff.xk7o 6 bt;n)zkposition with the same speed as it had initially if air resistance is negligible. If air resistance is apprecbxzknt v7) .cofk;6 f*iable, how will this result be altered?

  An object can have zero velocity /6,y j ( fhb5wb5nzrqxmhsu9 ;and nonzero acceleration at the same time.

  An object can have nonzero vewpkzrn 1dr-,7 r,fzp 7locity and zero acceleration at the same time.

  An elevator moving from the sec9 l o1qk;cuvy6 1dr9gcond floor to the fifth floor making no stops along the way has zero acceleratic kc v6doy rl199ugq;1on all the time.

  A rolling ball moves fry1s:; ato 2qmpom $x_1=1.7 \mathrm{~cm}$ to $x_2=-7.7 \mathrm{~cm}$ during the time from $t_1=2.5 \mathrm{~s}$ to $t_2=5.5 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

  A particle at $t_1=-3.4 \mathrm{~s}$ is at $x_1=2.7 \mathrm{~cm}$ and at $t_2=3.5 \mathrm{~s}$ is at $x_2=7.2 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

  A person jogs eight c.nhb (xjx9z 6qmj d3/ zg6a1jxomplete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 10.7 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, moving 9 q6hw zy+7tl*z8 m away in 10.5 s. It then turns abrlq +w7hy*t6zzuptly and gallops halfway back in 4.7 s. Calculate (a) its average speed  (数值)  $m/s$ and (b) its average velocity  (数值)  $m/s$ for the entire trip, using “away from the trainer” as the positive direction.

  A car accelerates frou. t1 .jwdw5xlm $13 \; m/s$ to $24 \; m/s$ in 5.0 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 :xks-yd lqr2 ag)gw9bt (:yy5$16 \; m/s$ to rest in a distance of 68 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

  A light plane must reach a speed of-y5 obt7fl1 xg $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.7 \; m/s^2$ ?  (数值)  $m$

  A world-class sprinter can burst out of the blocks to ess /ot/ fui9j19k(3qrlrugb0d c entially top speed about (qf 1 ud9ukt9 lr3cr/gb jio0/$10.9 \; m/s$ 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 fr, 9 so-xaa1hfgom a speed of $20 \; m/s$ to rest in 4.14 s. How far did it travel in that time?  (数值)  $m$

  In coming to a stop, a car leaves skid ma0 ghymhny) lt31gk;7c rks 92 m long on the highway. Assuming a deceleration ofgckn)th3 ymg0;7h1 ly $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

  A car is behind a truck g suc8xh3 op-bb 9-ii6loing $25 \; m/s$ 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 ruot;unce )b4b/n in less than 30.0 min. After exactly 27.0 min, the/uneo tbc; )4bre 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?    $s$