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

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

A

`15 N-s`

B

`10 N-s`

C

`20 N-s`

D

`30 N-s`

Text Solution

Verified by Experts

The correct Answer is:
D
`e = - ((v_(2) - v_(1))/(u_(2) - u_(1))) rArr 1 = - (5 - v_(1))/(5 - (-10)) = (v_(1) - 5)/(15)`
`rArr v_(1) = 20 m//s`
`:.` Impulse on ball `= m(vec(v) - vec(u)) = 1 xx [20 -(10)] = 30N-s`
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