Consider the following spring system.
$c_1 = 8,\quad c_2 = 10 \\ m_1 = 3,\quad m_2 = 6, \quad m_3 = 2$
Write the elongation matrix $A =$$\left[\Rule{0pt}{2.4em}{0pt}\right.$$\left]\Rule{0pt}{2.4em}{0pt}\right.$ (assume down is the positive direction).
Write the spring constant matrix $C =$$\left[\Rule{0pt}{2.4em}{0pt}\right.$$\left]\Rule{0pt}{2.4em}{0pt}\right.$
Write the stiffness matrix $K =$$\left[\Rule{0pt}{3.6em}{0pt}\right.$$\left]\Rule{0pt}{3.6em}{0pt}\right.$