Two drops of the same radius are falling through air with a steady velocity of \( 5 \mathrm{~cm}...

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Two drops of the same radius are falling through air with a steady velocity of \( 5 \mathrm{~cm} \) per sec. If the two drops coalesce, the terminal velocity would be
[MP PMT 1990; J \& K CET 2010]
(a) \( 10 \mathrm{~cm} \) per \( \mathrm{sec} \)
(b) \( 2.5 \mathrm{~cm} \) per sec
(c) \( 5 \times(4)^{1 / 3} \mathrm{~cm} \) per sec
(d) \( 5 \times \sqrt{2} \mathrm{~cm} \) per sec
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