Eight spherical rain drops of the same mass and radius are falling down with a terminal speed of 6 cms⁻¹. If they coalesce to form one big drop, what will be the terminal speed of bigger drop? (Neglect the buoyancy of the air)

Question

TextTerminal Velocity in Viscous Medium

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After terminal velocity is reached, the acceleration of a body falling through a fluid is

Derive the expression for terminal velocity of a rain drop falling in a vessel filled with fluid.