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Obtain the formula of mechanical energy ...

Obtain the formula of mechanical energy of damped oscillation for `b lt lt sqrt(km)`.

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Mechanical energy of damped oscillatior, in
`therefore E(t)= (1)/(2) kA^(2) e^(-(bt)/(m)), b lt lt sqrt(km)` then
`(b)/(sqrt(km)) lt lt 1`, by taking b=0
`therefore E(t) = (1)/(2) kA^(2)`.
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