Find the two natural frequencies when the first and second floor of the two$-$story building are identical, that is$,$ when $m1=m2=m$ and $k1=k2=k.$ What is the fundamental frequency $($the first natural frquency or the smallest modal frequency$)$ in rad$/$s$?$ Let $m=5\mathrm{.}7kg$ and $k=9\mathrm{.}9\frac{N}{m}.$ Enter your answer to the second nearest decimal place.