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
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a