JEE PHYSICS MCQ: MECHANICAL PROPERTIES OF FLUIDS

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A small sphere of mass m is dropped from a great height. After it has fallen

100m

, it has attained its terminal velocity and continues to fall at that speed. The work done by air friction against the sphere during the first

100m

of fall is

View answer and explanation

Correct option: B

Less than the work done by air friction in the second

100m

Option B is correct because the air friction increases with velocity, so more work is done in the second 100m where the sphere is closer to terminal velocity.

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