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**sketch or identify a graph of kinetic or potential energy as a function of time, and identify points in the motion where this energy is all potential or all kinetic.**

I know that mechanical energy is conserved within an isloated system so [tex]\frac{1}{2} kx^{2}[/tex] can be used to represent the total energy of the system.

However, for the "sketch" part.. Does the energy vs. time graph look like a sine wave? The graph never reaches the negative y region right? Energy can never be negative right? Thanks.