REQUIRES that \[\Lambda PE+KE=0\] or \[\frac{1}{2}k{{x}^{2}}-\frac{1}{2}mv_{0}^{2}=0\] \[\THEREFORE \] \[x=\SQRT{\frac{m}{k}}{{V}_{0}}\] \[\therefore \,\,\,\,\,\,{{F}_{\max }}=kx=\sqrt{mk}{{v}_{0}}\] or \[{{F}_{\max }}\propto \sqrt{k}\propto \sqrt{m}\propto {{v}_{0}}\]