Question

what do you mean by free vibrations of a nody​

Answer 1

Vibrations of a body is any frequency are transferred to the human body. Humans are exposed to vibration through a contact surface that is in a mechanical vibrating state. Humans are generally exposed to many different forms of vibration in their daily lives. This could be a driver's seat, a moving train platform, through a power tool, a training platform, or one of countless other devices.

Answer 2

Free vibration are oscillation where the total energy stays the over time.

This means that the amplitude of vibration remains same...

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