Braindead

A person pushes a box. He applies a force of 400 newtons, and he pushes the box for a distance of 4 meters. After he stops pushing, the box slides forward another meter. How much work was done by the person? • 100 joules • 2,000 joules • 1,600 joules • 40...

It takes 27 joules to lift a 20-pound box. A worker has a lever available that is 2.5 meters long. Which amount of force needs to be applied to lift the box? • 0.54 newton • 10.8 newtons • 67.5 newtons • 5.4 newtons