A crate of mass 10 kg is pulled 5 m up a rough slope inclined at an angle θ \theta\,θ to the horizontal, where tanθ=0.75\tan\theta = 0.75tanθ=0.75.
The coefficient of friction between the crate and the slope is 0.2. The crate is pulled at a constant speed by a force P P\,P acting parallel to the slope, as shown in the diagram.
Calculate the work done by the pulling force PPP.
(Take g=9.8 m s−2g = 9.8\text{ m s}^{-2}g=9.8 m s−2)
294.0 J294.0\text{ J}294.0 J
352.8 J352.8\text{ J}352.8 J
372.4 J372.4\text{ J}372.4 J
215.6 J215.6\text{ J}215.6 J