JEE Main Physics question

Physics Work, Energy and Power JEE Main

Statement 1: Work done by friction on a body sliding down an inclined plane is positive. Statement 2: Work done is greater than zero, if angle between force and displacement is acute or both are in the same direction.

(A)Assertion is True, Reason is True; Reason is correct explanation for Assertion
(B)Assertion is True, Reason is True; Reason is not correct explanation for Assertion
(C)Assertion is True, Reason is False
(D)Assertion is False, Reason is TrueCorrect

Answer: (D)

Solution

Friction always opposes relative motion, so on a body sliding down, friction acts up the incline (opposite to displacement, angle = 180°) and

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Question ID VK-154167