'n' small drops of same size fall through air with constant velocity 5 cm/s. They coalesce to form a big drop. The terminal velocity of the big drop is (a) 7n2/3 cm/s (b) 5n2/3 cm/s (c) 3n2/3 cm/s (d) 9n2/3 cm/s

Answer: (b). v ∝ r² and R = n1/3r, so v' = n2/3v. v' = 5n2/3 cm/s So the answer is (b) 5n2/3 cm/s.

'n' small drops of same size fall through air with constant velocity… | MHT CET 2021 (24 Sep, Shift 2)

Q45MHT CET 2021 · 24 SEP · SHIFT 2Medium

Terminal Velocity

'n' small drops of same size fall through air with constant velocity $5\text{ cm/s}$ . They coalesce to form a big drop. The terminal velocity of the big drop is

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Answer: (b)

$v \propto r^2$ and $R = n^{1/3}r$ , so $v' = n^{2/3}v$ .
$v' = 5n^{2/3}$ cm/s
So the answer is (b) $5n^{2/3}$ cm/s.

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Terminal Velocity question from MHT CET 2021 (24 Sep, Shift 2)

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