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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

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

B

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

C

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

D

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

Text Solution

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The correct Answer is:
C
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