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Work, Energy and Power
Question
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The bob A of a pendulum released from 30° to the vertical hits another bob B of the same mass at rest on a table as shown. How high does the bob A rise after the collision? Neglect the size of the bobs and assume the collision to be elastic.

Answer

The collision of bobs is elastic and masses of both the bobs are equal. Bob B is at rest, therefore, after collision of bob A with bob B, bob A comes to rest. Therefore, the bob A will not rise after the collision. 

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