NEET UG PHYSICS MCQ: MECHANICAL PROPERTIES OF FLUIDS

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A small iron sphere is dropped from a great height. It attains its terminal velocity after having fallen 32 m. Then, it covers the rest of the path with terminal velocity only. The work done by air friction during the first 32 m of fall is

{W_1}

. The work done by air friction during the subsequent 32 m fall is

{W_2}

. Then

View answer and explanation

Correct option: B

{W_1} < {W_2}

Option B (directly proportional to both radius

R

and velocity

v

) is correct because Stokes' law states that the viscous force is directly proportional to both radius and velocity.

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