Momentum and CollisionHard

Question

Two drops of equal radius are falling through air with a steady velocity of 5cm/sec. If the two drops coalesce , then its terminal velocity will be : -

Options

A.× 5 cm/s
B.cm/s
C.× 4 cm/s
D. × 5 cm/s

Solution

Radius of big drop
R = (n)1/3r = (2)1/3r
vT = (2)2/3 = 41/3
v′T = 41/3 5cm/s

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