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Question

Two identical drops falling with a terminal speed 'v' coalesce to form a bigger drop. The terminal velocity of the bigger drop will be


Solution

The correct option is C
43πR3=2.43πr3
R=213.r
vr2
v1r21=v2r22v=(r2r1)2v=v[(r21/3)r]2=v22/3

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