Forces and equilibrium — practice question

A $600\,\text{kg}$ crate is pulled up the line of greatest slope on a rough plane, using a rope fixed to a winch, at a steady speed of $2\,\text{m s}^{-1}$. The plane is inclined at $30^\circ$ to the horizontal, and the rope is parallel to the plane. The winch operates at a steady rate of $8\,\text{kW}$.