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The bob A of a pendulum released from a ...

The bob A of a pendulum released from a height h hits head-on another bob B of the same mass of an identical pendulum initially at rest. What is the result of this collision? Assume the collisio to be elastic (see figure).

A

Bob A comers to rest at B and bob B moves to the left attaining a maximum height h

B

Bobs A and B both move to the left, each attaining a maximum height `(h)/(2)`

C

Bob B moves to the left and bob A moves to the right, each attaining a maximum height `(h)/(2)`

D

Both bob come to rest.

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