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A smooth ball of mass m is suspended fro...

A smooth ball of mass `m` is suspended from a light string of length `1 m`. Another ball of mass `2m` strikes the ball of mass in horizontally with a speed of `u=sqrt(35)m//s`. The coefficient of restitution for the collision is `e`. The string becomes loose, when it makes an angle of `30^(@)` with the horizontal, find the value of `e`.

A

`60^(@)`

B

`90^(@)`

C

`120^(@)`

D

`180^(@)`

Text Solution

Verified by Experts

The correct Answer is:
D
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