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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.

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It transfers its entire momentum to the ball on the table, and does not rise at all.
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