1. The problem statement, all variables and given/known data A spring of negligible mass exerts a restoring force on a point mass M given by F(x)= (-k1x)+(k2x^2) where k1 and k2 >0. Calculate the potential energy U(x) stored in the spring for a displacement x. Take U=0 at x=0. 2. Relevant equations ΔU=∫F(x)dx U=½kx^2 3. The attempt at a solution Using the equation above I tried to find the potential energy of the spring after it has been displaced by some distance x. I integrated F(x) from x=0 to some displacement x=x0. ΔU=∫(-k1x)+(k2x^2)dx ΔU=-k1½x0^2+k2⅓x0^3 Is this the right way in finding the potential energy?