A body dropped from a height \( h \) with an initial speed zero, strikes the ground with a veloc...

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A body dropped from a height \( h \) with an initial speed zero, strikes the ground with a velocity \( 3 \mathrm{~km} / \mathrm{h} \). Another body of same mass is dropped from the same height \( h \) with an initial speed \( -u^{\prime}=4 \mathrm{~km} / \mathrm{h} \). Find the final velocity of second body with which it strikes the ground [CBSE PMT 1996]
(a) \( 3 \mathrm{~km} / \mathrm{h} \)
(b) \( 4 \mathrm{~km} / \mathrm{h} \)
(c) \( 5 \mathrm{~km} / \mathrm{h} \)
(d) \( 12 \mathrm{~km} / \mathrm{h} \)
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