A. y" – 3y' + 2y = 0 B. y" + 2y' +2y = 0 C. y" + 4y = 0 D. y" + 2y' + y = 0 Table 1: A-D are homogeneous second order linear equations. 19. Identify which differential equation(s) in Table 1: (a) do not represent the motion of a spring-mass system? Explain your reasoning. (b) represent an undamped vibration? Explain your reasoning. (c) represent a damped vibration? Explain your reasoning.

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