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For a single degree-of-freedom (SDOF) system with mass, damping, and stiffness, should the period (in sec) of the response in free vibration be computed

For a single degree-of-freedom (SDOF) system with mass, damping, and stiffness, should the period (in sec) of the response in free vibration be computed based on the undamped natural frequency (wn) or the damped natural frequency (wa)? Explain your answer.

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