The bob (mass \( m \) ) of a simple pendulum of length \( \mathrm{L...

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The bob (mass \( m \) ) of a simple pendulum of length \( \mathrm{L} \) is held horizontal and then released. It collides
P elastically with a block of equal mass lying on a

W. frictionless table. The kinetic energy of the block will be :-
(1) Zero
(2) \( m g L \)
(3) \( 2 \mathrm{mgL} \)
(4) \( \frac{m g L}{2} \)
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