Q. Two spherical raindrops of equal size are falling vertically through air with a terminal velocity of 1m/s. What would be the terminal speed if these two drops were to coalesce to form a larger spherical drop.

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Solution

according to stoke`s law velocity is proportional to radius ^2. conserve volume : radius of coalesced drop is 2^1/3 each drop. therefore answer is 100cm/s X 2^2/3

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