! "#press $oule in terms o% the &ase units o% mass' len(th an) time the k(' m 's! *
k( m +1s
C
k(m+1s+1
2
,
k( m2 s2 -
k(s+2
.! * racin( car accelerates uni%ormly throu(h three (ear chan(es ith the %olloin( aera(e spee)s! 20 m s +1 %or 2!0 s .0 m s +1 %or 2!0 s 0 m s +1 %or !0 s hat is the oerall aera(e spee) o% the car3 *
12 ms+1
,
1!ms+1
C
.0 ms+1
-
.4 ms+1
5!
! *n o&$ect is pro$ecte) ith ith elocity .0 ms+1 at an an(le o% .5 to the hori6ont hori6ontal! al! *ir *ir resist resistance ance is ne(li(i& ne(li(i&le! le! hat is the spee) o% the o&$ect a%ter 5 secon)s3 *
21 ms+1
,
24 ms+1
C
5 ms+1
-
.9 ms+1
7! * %orce o% 2 actin( on a particle o% mass 10 k( pro)uces an acceleration o% 0 m s +2 ! * %orce o% 5 actin( on a particle o% mass M pro)uces an acceleration o% 50 +1
m ! hat is the mass o% M3 *! ! k(
,
.! k(
C
-
0 k(
21 k(
4! * uni%orm plank o% ei(ht 0 8 is 2000mm lon( an) rests on a support that is 00 mm %rom en) "! *t hat )istance %rom " must a 108 ei(ht &e place) in or)er to &alance the plank3
* 150 mm
,
225mm
C 75 mm
-!
.50 mm
9! *n shape) ri(i) leer arm is piote) at point P!
hree %orces act on the leer arm arm as shon shon in the )ia(ram! )ia(ram! hat is the the ma(nitu)e o% the resultant moment o% these %orces a&out pint P3 *! 0 8m , 5 8m C 50 8m 90 8m 10! * man ros a &oat ith a spee) o% 14 km h +1 in the north; est )irection! he shoreline makes an an(le o% 15 south o% est! hat are the components o% the elocity o% the &oat alon( the shoreline an) perpen)icular to the shoreline3 * 9kmh+1' 9 2kmh+1 , 9kmh+1' 9 kmh+1 C 9 2 kmh+1' 9 2 kmh+1 9 kmh+1' 9 kmh+1
11!hat is not true a&out to %orces that (ie rise to a couple3 * , C -
hey act in opposite )irections they act on the same &o)y hey act at the same point they &oth hae the same ma(nitu)e
1 he ratio o% the aera(e elocity o% a train to its ma#imum elocity )urin( a $ourney &eteen to stations is * e
17!=n the )isplacement >time (raph 'to strai(ht lines make an(le 0an) 0'ith time a#is as shon in the ?(ure! he ratio o elocities represente) &y them is
* C
1 2 1
, -
1 2 1
14! o &ullets are ?re) hori6ontally ith )i@erent elocities %rom the same hei(ht! hich &ullet ill reach the (roun) ?rst3 *! he he slo sloer er one one , he %aster one C ,oth ill reach simultaneously simultaneou sly - It cannot &e pre)icte) 19! * soli) &lock o% o% material o% o% )ensity A 'hei(ht h' an) hori6ontal hori6ontal sur%ace area * is immerse) in a lip2D(
