A rod of length 50 cm is pivoted at one end. It is raised such that if makes an angle of 30° from the horizontal as shown and released from rest. Its angular speed when it passes through the horizontal (in rad s-1) will be (g = 10 ms-2)
1
\(\sqrt {\frac{{30}}{2}} \)
2
\(\sqrt {30} \)
3
\(\frac{{\sqrt {20} }}{3}\)
4
\(\frac{{\sqrt {30} }}{2}\)