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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 in Fig. 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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The bob A will not rise because when two bodies of same mass undergo an elastic collision, their velocities are interchanged. After collision, ball A will come to rest and the ball B would move with the velocity of A Thus the bob A will not rise after the collision.
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In elastic collision the linear momentum is conserved .linear momentum =mass x velocity =mv here mass of A and B are same. so if elastic collision occur then A bobs complete transfer it momentum on bobs B.their velocities interchanged After collision A will come to rest and B moves with velocity of...
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In elastic collision the linear momentum is conserved .
linear momentum =mass x velocity =mv

here mass of A and B are same.

so if elastic collision occur then A bobs complete transfer it momentum on bobs B.their velocities interchanged 

After collision A will come to rest and B moves with velocity of A.thus bob A would not rise after collision.

 

 

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