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.

Explanation

When the bob A hits the bob B of te same mass , velocities of A and B are interchanged . Therefore , the bob A comes to rest and comes to rest and aomes at location of bob B . Whereas the bob B starts moving with the velocity of A . The bob A will not rise after collision .