A small steel ball of mass m and radius ...

A small steel ball of mass `m` and radius `r` is falling under gravity through a viscous liquid of coefficient of viscosity `eta`. If `g` is the value of acceleration due to gravity. Then the terminal velocity of the ball is proportional to (ignore buoyancy)

`(mg eta)/(r)`

`mg etar`

`(mgr)/(eta)`

`(mg)/(reta)`

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