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When a mass of 3 kilograms is attached to a spring whose constant is 48 N/m,...

When a mass of 3 kilograms is attached to a spring whose constant is 48 N/m, it comes to rest in the equilibrium position. Starting at t = 0, a force equal to f(t) = 51e−2t cos 4t  is applied to the system. Find the equation of motion in the absence of damping.

x(t)= ?? m

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