JEE Main 2022 Physics question
A small spherical ball of radius 0.1 mm and density kg falls freely under gravity through a distance h before entering a tank of water. If, after entering the water the velocity of ball does not change and continue to fall with same constant velocity inside water, then the value of h will be m. (Given g = 10 , viscosity of water = )
Answer: 20
Solution
The speed after falling freely through h is , and this equals the terminal speed in water: with $ρ
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