Consider a 10.0 kg box being lifted 15.0 m by an elevator at constant speed. (a) Draw a free body diagram of the box and write Newton's second law for the forces on it. (b) What is the net force on the box? (c) What is the work done by the force of gravity? (d) What is the work done by the elevator on the box?

(e) What is the net work done on the box? (f) What is the relationship between the work done by gravity on the box, the work done by the elevator on the box, and the net work done on the box?