Momentum and CollisionHard

Question

A ball of mas 1 kg  strikes a heavy platform, elastically, moving upwards with a velocity of 5m/s. The speed of the ball just before the collision is 10m/s downwards. Then the impulse imparted by the platform on the ball is

Options

A.15 N-s
B.10 N-s
C.20 N-s
D.30 N-s

Solution

e = - ⇒ 1 = -
⇒ v1 = 20 m/s
∴ Impulse on ball = m = 1 [20 - (10)] = 30 N-s

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