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The undamped mass spring system is forced by the harmonic force F (t) = F0cosΩt for the initial state x (0) = x0 and ẋ (0) = ẋ0. Write the equation of motion of the system for a) r ≠ 1 b) r = 1. (r is used to express resonance states.)
If r = 0 phase difference = 0
If r = 1 phase difference = 90
If r = infinite phase difference = 180

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