determine the natural frequency, natural

time period of a system consisting of mass

$100kg$ attached to a horizontal cantilever

beam through a linear spring of stiffness $k.$

The thickness of the cantilever beam $0\mathrm{.}8$ cm

and $1\mathrm{.}2$ cm $($height$).$ Consider length as

$70cm$ and $K=10k$g$/$cm and $E=2\mathrm{.}1{10}^6$

kg$/$cm$2$