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A spring is stretched 6 m by a mass that weighs 8 kg. The mass is...

A spring is stretched 6 m by a mass that weighs 8 kg. The mass is attached to a dashpot mechanism that has a damping constant of 0.25 Ns/m, and is acted on by an external force of 4 cos(2t) N.

(a) Write down the IVP that describes the system.

(b) Determine the steady-state response of this system (you may simply use the formula in the text and plug in the appropriate numerical coefficients). Note: You do not need to find the phase shift.

(c) If the given mass is replaced by a mass m, determine the value of m for which the amplitude of the steady-state response is maximum. Give an exact (not decimal) answer.

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