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The coefficient of restitution for a bod...

The coefficient of restitution for a body is `e=(1)/(3)`. At what angle the body must be incident on a perfectly hard plane so that the angle between the direction before and after the impact be at right angles:

A

`37^@`

B

`60^@`

C

`45^@`

D

`30^@`

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The correct Answer is:
D
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