A raindrop with radius \( 1.5 \mathrm{~mm} \) falls from a cloud at a height \( 1200 \mathrm{~m}...

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A raindrop with radius \( 1.5 \mathrm{~mm} \) falls from a cloud at a height \( 1200 \mathrm{~m} \) from ground. The density of water is \( 1000 \mathrm{~kg} / \mathrm{m}^{3} \) and density of air is \( 1.2 \mathrm{~kg} / \mathrm{m}^{3} \). Assume the drop was spherical throughout the fall and there is no air drag. The impact speed of the drop will be
[DUMET 2009]
(a) \( 27 \mathrm{~km} / \mathrm{h} \)
(b) \( 550 \mathrm{~km} / \mathrm{h} \)
(c) Zero
(d) \( 129 \mathrm{~km} / \mathrm{h} \)
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