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) 29r21-ρηg

(b) 281r2ρ-1ηg

(c) 281r4ρ-1η2g

(d) 29r4ρ-1η2g

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