Question:

A $12\mathrm{.}0$ kg box is being pushed across a horizontal surface with a force of $50\mathrm{.}0$ N at an angle of $30\mathrm{.}0$ above the horizontal. The box moves a distance of $8\mathrm{.}0$ m in the direction of the applied force.

Calculate the work done by the applied force on the box.

If the coefficient of kinetic friction between the box and the surface is $0\mathrm{.}2,$ calculate the work done by the frictional force on the box.