Sixty four rain drops of radius 1 mm each falling down with a terminal velocity of 
coalesce to form a bigger drop. The terminal velocity of bigger drop is 
.
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(160) At terminal velocity, gravitational force equals Stokes drag: 
For a sphere with mass 
, this gives 
Therefore, 
When 64 drops coalesce: 
, so 
New terminal velocity: 
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