The stiffness matrix of a beam element is (2EI/L) \(\left[ \begin{matrix} 2 & 1 \\ 1 & 2 \\ \end{matrix} \right]\) which one of the following is its flexibility matrix?
1
(L/2EI)\(\left[ \begin{matrix} 2 & 1 \\ 1 & 2 \\ \end{matrix} \right]\)
2
(L/6EI)\(\left[ \begin{matrix} 2 & -1 \\ -1 & 2 \\ \end{matrix} \right]\)
3
(L/4EI)\(\left[ \begin{matrix} 2 & 1 \\ 1 & 2 \\ \end{matrix} \right]\)
4
(L/6EI)\(\left[ \begin{matrix} 1 & -2 \\ -2 & 1 \\ \end{matrix} \right]\)