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The bob A of a simple pendulum released ...

The bob A of a simple pendulum released from `30^(@)` to the vertical hits another bobo B of the same mass at rest on a table as shown in figure. How high does the bob A rise after the collision ? Neglect the size of the bobs and assume the collision to be elastic.

A

`30^@`

B

`60^@`

C

`15^@`

D

zero

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The correct Answer is:
D
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