Eight equal drops of water each of radius `r=2mm` are falling through air with a terminal velocity of `16(cm)/(s)`. The eight drops combine to form a big drop. Calculate the terminal velocity of big drop.

Options

A. `16(cm)/(s)`
B. `32(cm)/(s)`
C. `64(cm)/(s)`
D. none of these

Answer

C

Explanation

`V_("bigger")=n^((2)/(3))V_("small")`