# Homework Help: Damped Oscillatory motion : Period

1. Mar 31, 2015

### Bedeirnur

Relevant equations

1)
2) $$T = \sqrt{ \frac{m}{k} }$$
3) $$T = \frac{2 \pi }{ \omega }$$

In some problems about damped oscillatory motion, the requests ask for example "Calculate the amplitude after 20 oscillations"

I know that i need to find the period first of all but :

Do i find the period by using equation number 2? Is that constant? I've seen other threads where they calculated T with (2) and used it for everything but, if we have a different value of \omega overtime, why did we use the initial \omega to find the period?

If i divide 2π by

what do I find? Isn't that the period?

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