A sphere of mass M and radius R is falling in a viscous fluid .The terminal velocity attained by the falling object will be proportional to ……

Options

A. `R^(2)`
B. R
C. `(1)/(R )`
D. `(1)/(R^(2))`

Answer

a

Explanation

In terminal velocity `v_(t)=(2)/(9)*(R^(2)g)/(eta)(rho-rho_(o))v_(t)propR^(2)` (All other terms are constant)