Answer:
\[\frac{\text{Kinetic energy}}{\text{Total energy}}=\frac{\frac{1}{2}m{{\omega }^{2}}\left( {{A}^{2}}-\frac{{{A}^{2}}}{4} \right)}{\frac{1}{2}m{{\omega }^{2}}{{A}^{2}}}=\frac{\mathbf{3}}{\mathbf{4}}\]
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