1. The problem A very simple question on a quiz given to me states that, "A 63 kg diver is standing on a diving board waiting to commence her dive. The diving board has compressed 0.08 m. Determine the elastic potential energy of the diver." 2. The attempt at a solution I thought this question was simple enough. The gravitational potential energy simply gets converted into elastic potential energy: However, apparently the correct solution is first finding the equation of the spring constant, k, from the net force equation, then substituting it into the equation for the elastic potential energy, E = 1/2(kx^2): I find no issue with both solutions, but the equations produced in both solutions are not equivalent to each other! The only difference is multiplying by 1/2. How can this be explained?