4. (5 points) A person is pushing a 46-kg box with constant velocity on a rough floor over a distance of 10.3 m. If the coefficient of friction between the box and floor is 0.50, how much is the work done by the person. 5. (5 points) If the spring constant k of a spring is 88.0 N/m, how much this spring must be compressed from the uncompressed (or equilibrium) position in order to store 45.0 J of potential energy