A spherical body falling through a viscous liquid of infinite extent ultimately attains terminal velocity, when

Upthrust + Weight = Viscous drag

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Weight + Viscous drag = Upthrust

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Viscous drag + Upthrust = Weight

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Viscous drag + Upthrust > Weight

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Solution

The correct option is C Viscous drag + Upthrust = Weight
Both viscous drag and upthrust are directed upwards and weight is directed downwards. For terminal velocity, the net upward force should be equal to the downward force, i.e.
Viscous drag + Upthrust force = Weight

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