ok, maybe i am missing something here with this problem and it is probably really simple, but here it is: A force of 775N stretches a certain spring a distance of 0.200m. What is the potential energy of the spring when a mass of 65.0kg hangs vertically from it? I have tried conservation of energy laws, figuring that the total potential energy of the system is elastic energy + grav. potential energy. I have tried equatng gravtational potential energy to elastic potential energy, which has gotten me nowhere. My first step was to find k, the spring constant, which I got to be 3875 using Hooke's Law. Yet, the biggest problem I am having is trying to calculate the distance the spring will stretch with this mass. .2 m is not correct because the spring should have a longer distance due to gravity. Hence, i was trying to equate grav. potential energy and elastic potential energy. I think I am just completely missing something or misinterpreting the problem.