Please help! Donnie is working on his car and uses a pulley system that can lift a 1250 N engine up to a height of 2 m by exerting a force of 250 N. How much rope would Donnie need to pull?

While carrying a heavy box up the stairs, you set the box on a step and rest. then you pick up the box and carry it to the top of the stairs. describe these actions in terms of balanced and unbalanced forces acting on the box.