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A ball of mass 1 kg strikes a heavy plar...

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

A

15N-s

B

10 N-s

C

20N-s

D

30N-s

Text Solution

Verified by Experts

The correct Answer is:
D
By definition of `e=1=(v-5)/(5-(-10))rArrv=20m//s`

Impulse imparted by the platform on the ball
`=1[20-(-10)]=30N-s`
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