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Q.

Two equal drops of water are falling through air with a steady velocity v. If the drops coalesced, what will be the new velocity ?

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a

22/3v

b

25/3v

c

27/3v

d

21/3v

answer is A.

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Detailed Solution

 Volume of bigger drop = {n} \times volume of smaller drop 

43πR3=2×43πr3 R=21/3r Terminalvelocityr2 v'=22/3v

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