5. In an assembly line, a 0.3 kg metal box is attached to a horizontal spring with a spring constant of SOON/m. The spring is fixed at one end. The box is moving and has a kinetic energy of 10J as it passes through the spring's equiiibrium position. a) What rate is the spring doing work on box as the box passes through the equilibrium position? b) What rate is the spring doing work on the box when the spring is compressed a distance of 0.1m and the box is moving away from the equilibrium position