Work done by static friction on an object :

may be positive.

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must be negative.

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must be zero.

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None of these

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Solution

The correct option is D may be positive.
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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The work done by kinetic friction on an object is always negative.

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