Question

Two balls have radii in ratio 2 ratio 1.The ratio of their terminal velocity will be

Answer 1

Explanation:

for terminal velocity,

v=2/9×r2g(D1-D2)/etha

where,D1 and D2 are densities of spherical ball and liquid

etha is coefficient of viscosity,

from above eqn

v is directly proportional to r2

v=(2/1)2

v=4