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Assertion(A):If the surface between the blocks A and B is rough, then work done by friction on block B is always negative
Reason(R): Total work done by friction on both the blocks is always zero.

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If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion

If Assertion is correct but Reason is incorrect

If Assertion is incorrect but Reason is correct

answer is C.

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Detailed Solution

Friction on ‘B’ acts to the left when the motion is to the right. Hence work done by friction on ‘B’ is always negative.
If they move together, net work done $b_{1}$ friction is zero otherwise not.

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