A small spherical ball of radius 0.1 mm and density 10⁴ 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 ___________ m.

(Given g = 10 ms^$-$2, viscosity of water = 1.0 $\times$ 10^$-$5 N-sm^$-$2).