Assertion : Work done by friction on a body sliding down an inclined plane is positive. Reason : Work done is greater than zero, if angle between force and displacement is acute or both are in same direction.

Options

A. both assertion reason are true and reason is the correct explanation of the assertion.
B. both assertion reason are correct and reason is not the correct explanation of the assertion.
C. Assertion is correct but reason is incorrect
D. Assertion is incorrect but reason is correct

Answer

D