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A ball of radius r and density ρ falls ...

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 `eta` the value of h is given by
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A

`""_(9)^(2)r^(2)((1-rho)/(eta))g`

B

`(2)/(81)r^(2)((rho-1)/(eta))g`

C

`(2)/(81)r^(2)((rho-1)/(eta))^(7)g`

D

`(2)/(9)r^(2)((rho-1)/(eta))^(3)g`

Text Solution

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The correct Answer is:
C
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