Question

A person pulls a 200 kg load 50 m across a level floor using a rope that is 35 degree above the horizontal. The person exerts a force of 150 N on the rope, how much work is done by the person?

Answer 1

By the definition of the work done, we have:

$$W=Fdcos\theta,$$ $$W=150\ N\cdot50\ m\cdot cos35^{\circ}=6144\ J.$$