Work done by static friction on a body is

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Either positive or zero

Always zero

Can be positive, negative or zero

Always non zero

answer is C.

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Detailed Solution

Work done by static friction can be negative , positive as well as zero.
Consider the blocks shown in the figure to be moving together
due to friction between them. The free body diagrams of both the blocks is shown below. Work done by static friction on A is positive and on B is negative.

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