A particle is projected at 60° to the horizontal with a kinetic energy K. The kinetic energy at the highest point is
K
0
K/2
K/4
D.
K/4
A bomb of mass 16 kg at rest explodes into two pieces of masses of 4 kg and 12 kg. The velocity of the 12 kg mass is 4 ms^{−1} . The kinetic energy of the other mass is
144 J
96 J
288 J
192 J
C.
288 J
m_{1}v_{1} = m_{2}v_{2}
A mass of M kg is suspended by a weightless string. The horizontal force that is required to displace it until the string makes an angle of 45° with the initial vertical direction is
A.
A player caught a cricket ball of mass 150 g moving at a rate of 20 m/s. If the catching process is completed in 0.1 s, the force of the blow exerted by the ball on the hand of the player is equal to
300 N
150 N
30
3 N
C.
30
(mv-0)
⇒ 0.15 x 20
F = 3/0.1 = 30 N