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19. A ball of radius r and density ρ falls freely under gravity through a distance h before entering water. Velocity of ball does not change even on entering water. If viscosity of water is η, the value of h is given by

(a)  (2/9)r2[(1- ρ)/η]g

(b)    (2/81)r2[(ρ- 1)/η]g

(c)    (2/81)r4[(ρ- 1)/η]2 g

(d)    (2/9)r4[(ρ- 1)/η]2 g

Answer-c

(5)

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