Question

1. A ball of mass 100 gm moving with speed of 20 m/s is turned back with same speed in 0.1 s. The
impulse on the ball is?
(A) 4 Ns (B) 2 Ns
(C) 40 Ns
(D) 20 Ns​

Answer 1

Answer:

c )40 NS

Explanation:

Impulse = 2mv×t

Answer 2

Mass of the ball = 100 gm

Velocity of the ball before collision = 20m/s

So , momentum = mv = 0.1*20 = 2 kg m/s

Velocity of the ball after collision = -20m/s ( -ve sign indicates the opposite direction )

therefore , final momentum = m(-v) = 0.1 * (-20) = -2 kg m/s

impulse = change in momentum

= final momentum - initial momentum

= -2 -2

= -4 kg m/s

Hope it will help you .