A puck sliding on a horizontal surface hits the free end of a spring that is held fixed at the other end. There is friction between puck and surface. Consider the interval from the instant before the puck comes in contact with the spring until the instant the puck has zero velocity and the spring reaches maximum compression. Draw an energy diagram for a system that contains the puck and for which the work done on the system is nonzero. (Your system may include objects in addition to the puck if you like.)