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

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

Solution : Work done against friction

= – work done by friction

= -(-μMg cos θ × s )

= μMg cos θ × s

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