Can work be done on a system if there is no motion? I would say no, no motion = no energy... Is it possible for a system to have negative potential energy? I would say yes, since the choice of the zero of potential energy is arbitrary. A 500-kg elevator is pulled upward with a constant force of 550N for a distance of 50 m. What is the work done by the 550N force? From what I understand, we multiply 550N by 50 m, and get about 3.00x 104 J. Thanks for your help!