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The velocity of small ball of mass M and...

The velocity of small ball of mass `M` and density `d_(1)` when dropped a container filled with glycerine becomes constant after some time. If the density of glycerine is `d_(2)`, the viscous force acting on ball is

A

`Mg (1- d_(2)/dd_(1))`

B

`Mg d_(1)/d_(2)`

C

`mg(d_(1)-d_(2))`

D

`mgd_(1)d_(2)`

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