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Two small spherical metal balls, having ...

Two small spherical metal balls, having equal masses, are made from materials of densities `rho_(1) and rho_(2) (rho_(1)=8rho_(2))` and have radii 1 mm and 2mm respectively, they are made to fall vertically (from rest) in a viscous medium whose coefficient of viscosity equal `eta` and whose density is 0.1 `rho_(2)`. The ratio of their terminal velocities would be

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