A cantilever beam of negligible weight is carrying a mass M at its free end. It is supported by an elastic spring support of stiffness K1 as shown in figure below. If K2 represents the bending stiffness of the beam, the natural frequency in rad/s is
1
\(\sqrt {\frac{{{K_1}{K_2}}}{{M({K_1} + {K_2})}}} \)
2
\(\sqrt {\frac{{({K_1} - {K_2})}}{M}} \)
3
\(\sqrt {\frac{{2({K_1} + {K_2})}}{M}} \)
4
\(\sqrt {\frac{{({K_1} + {K_2})}}{M}} \)
5
\(\sqrt {\frac{{({K_1})}}{M}} \)