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In an experiment to verify Stokes law ,...

In an experiment to verify Stokes law , a small spherical ball of radius r and density `rho` falls under gravity through a distance h in air before entering a tank of water. If the terminal velocity of the ball inside water is same as its velocity just before entering the water surface , then the value of h is proportional to : ( ignore viscosity of air ) .

A

`r^(4)`

B

r

C

`r^(3)`

D

`r^(2)`

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