(a)[1]
Calculate the work done against friction.
(b)[2]
Find the change in gravitational potential energy of the box.
(c)[1]
Find the work done by the pulling force.
Mathematics 9709 · AS & A Level · Energy, work and power
Energy, work and power — practice question
A box with mass $5\,\mathrm{kg}$ is dragged a distance of $15\,\mathrm{m}$ at steady speed along a rough plane that is tilted at an angle of $20^\circ$ to the horizontal. It travels along the line of greatest slope, and a frictional force of $40\,\mathrm{N}$ acts against the motion. The pulling force is parallel to the line of greatest slope.