When a 4 kg mass is attached to a spring whose constant is 100 N/m, it comes to rest in the equilibrium position Starting at t=0, a force equal to f(t) = 12e cos 4t is applied to the system. In the absence of damping, -5t (a) find the position of the mass when t=ä. (b) what is the amplitude of vibrations after a very long time?

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