A crate of mass 8 kg is pulled at a constant speed up a rough inclined plane by a force P P\,P acting parallel to the slope, as shown in the diagram.
The plane is inclined at an angle θ \theta\,θ to the horizontal, where sinθ=0.6\sin\theta = 0.6sinθ=0.6. The coefficient of friction between the crate and the plane is μ=0.25\mu = 0.25μ=0.25.
Using g=9.8 m s−2g = 9.8\text{ m s}^{-2}g=9.8 m s−2, calculate the work done by the pulling force P P\,P in moving the crate a distance of 5 m up the plane.
156.8 J156.8\text{ J}156.8 J
235.2 J235.2\text{ J}235.2 J
313.6 J313.6\text{ J}313.6 J
372.4 J372.4\text{ J}372.4 J