A simple two-degree-of-freedom system with harmonic excitation is illustrated the system, let m₁ = 9kg, m2 = 1kg, k₁ = 24 N/m and k₂ = 3 N/m and the damping is assumed to be proportional with a = 0 and ẞ= 0.1. Calculate the responses of the system. . In k₁ m₁ 3 C1 k₂ m2 x2 x1 F2(t) = 3 cos 2t