The bob of a simple pendulum (mass \( m \) and length \( l \) ) dropped from a horizontal positi...

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The bob of a simple pendulum (mass \( m \) and length \( l \) ) dropped from a horizontal position strikes a block of the same mass elastically placed on a horizontal frictionless table. The K.E. of the block will be
(a) \( 2 m g l \)
(b) \( \mathrm{mgl} / 2 \)
(c) \( \mathrm{mgl} \)
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