The equation of free vibrations of a system is $$\frac{{{{\text{d}}^2}{\text{x}}}}{{{\text{d}}{{\text{t}}^2}}} + 36{\pi ^2}{\text{x}} = 0{\text{,}}$$ its natural frequency is
A. 3Hz
B. $$3\pi {\text{Hz}}$$
C. 6Hz
D. $$6\pi {\text{Hz}}$$
Answer: Option A
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w=6 pie
6pie=2*pie* N
N= 3