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

A ball of radius r and density r 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
`

A

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

B

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

C

`2/81r^(4)((rho-1)/(eta))g`

D

`2/9r^(4)((rho-1)/(eta))g`

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