Question

A box with a mass of 50 kg is shoved by a man across the floor with a force of 100 N through a distance of 5 m. He then shoves it up a 300 inclined to a height of 1 m by exerting a force equal to 3/5 its weight. What is the final potential energy of the box?

Answer 1

The final potential energy of the box depends on its height (position) only:

$$E=mgh,\\ E=50\cdot9.8\cdot1\cdot\sin30°=245\text{ J}.$$