Q: When a body of mass M slides down an inclined plane of inclination θ , having coefficient of friction μ through a distance s , the work done against friction is
(A)μ Mg cosθ s
(B)μ Mg sinθ s
(C)Mg (μ cosθ – sin θ)s
(D)None of the above
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Ans: (A)
Sol: Work done against friction
= – work done by friction
= -(-μMg cos θ × s )
= μMg cos θ × s