A small spherical ball of radius \( 0.1 \, \text{mm} \) and density \( 10^{4} \, \text{kg m}^{-3} \) falls freely under gravity through a distance \( h \) before entering a tank of water. If, after entering the water the velocity of ball does not change and it continue to fall with same constant velocity inside water, then the value of \( h \) will be _______ \( \text{m} \).
(Given \( g = 10 \, \text{m s}^{-2} \), viscosity of water \( = 1.0 \times 10^{-5} \, \text{N -s m}^{-2} \).)
