A body freely falling from the rest has a velocity ' \( v \) ' after it falls through a height '...

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A body freely falling from the rest has a velocity ' \( v \) ' after it falls through a height ' \( h \) '. The distance it has to fall down for its velocity to become double, is
[BHU 1999]
(a) \( 2 h \)
(b) \( 4 h \)
(c) \( 6 \mathrm{~h} \)
(d) \( 8 h \)
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