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27 identical drops of water are falling down vertically in air each with a terminal velocity of 0.15m/s. If they combine to form a single bigger drop, what will be its terminal velocity?

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Let r = radius of each drop, v = 0.15 m/s

Let R be the radius of the big drop.

Volume of big drop = Volume of 27 small drops

Let v1 be the terminal velocity of bigger drop

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