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4

A body of weight w placed on an inclined plane is acted upon by a force P parallel to the plane which causes the body just to move up the plane. If the angle of inclination of the plane is θ and angle of friction is φ, the minimum value of P, is

A. w sin (φ - θ)/cos φ

B. w sin (θ - φ)/cos φ

C. w cos (θ + φ)/cos φ

D. w sinθ cos(θ - φ)/sin φ