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A small sphere of mass $m$ is dropped from a height. After it has fallen $100 m$ , it has attained its terminal velocity and continues to fall at that speed. Then the magnitude of work done.

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by buoyancy of air is in first $100 m$ is equal to that in the second $100 m$

by viscosity of air is greater in first $100 m$ than in the second $100 m$

by buoyancy of air is lesser in first $100 m$ than that in the second $100 m$

by viscosity of air is lesser in first $100 m$ than in the second $100 m$

answer is A, B.

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Detailed Solution

Average viscous force over the first $100 m$ is lesser than that over second $100 m$ , as viscous force is proportional to $v$ . But buoyancy force of air is constant throughout.

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