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A small sphere of mass m is dropped from a great height. After it has fallen 100 m, 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 100 m of fall is

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equal to the work done by air friction in the second 100 m

greater than the work done by air friction in the second 100 m

less than the work done by air friction in the second 100 m

we cannot say

answer is B.

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Detailed Solution

Viscous force is small, during first 100 m of fall than during second 100 m of fall

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