JEE Main 2013 Physics question
In an experiment, a small steel ball falls through a liquid at a constant speed of 10 cm/s. If the steel ball is pulled upward with a force equal to twice its effective weight, how fast will it move upward ?
Answer: (3)
Solution
Falling at constant speed: the viscous drag balances the effective weight W, so with v = 10 cm/s. Pulled up with 2W, at constant speed
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