1. ( [mathrm{Ch} 6-4] ) For the system below, write down the equation of motion of the system then arrange it in the matrix form as follows ( oldsymbol{M} ddot{oldsymbol{x}}+oldsymbol{K} oldsymbol{x}=0 ), where ( oldsymbol{x}=left[egin{array}{lll}x_{1} & x_{2} & x_{3}end{array} ight]^{T} ) is the displacement vector, and ( oldsymbol{M}, oldsymbol{K} ) are the mass and stiffness matrix respectively.

[Ch 64 ] For the system below, write down the equation of motion of the system then arrange it in the matrix form as follows Mx+Kx=0, where x=[x1x2x3]T is the displacement vector, and M,K are the mass and stiffness matrix respectively