A spherical body falling through a viscous liquid of infinite extent ultimately attains terminal velocity, when
A
Upthrust + Weight = Viscous drag
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B
Weight + Viscous drag = Upthrust
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C
Viscous drag + Upthrust = Weight
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D
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