When a 6?kg mass is attached to a spring whose constant is 24?N/m, it comes to...

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When a 6?kg mass is attached to a spring whose constant is24?N/m, it comes to rest in the equilibrium position. Starting at?t = 0, a force equal to ?f?(t) ?=?42e?7t?cos?4t ?is applied tothe system. In the absence of damping,
(a)find the position of the mass when ?t =?.
(b)what is the amplitude of vibrations after a very longtime?

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