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A body of mass equal to 4 kg is attached to a spring of constant k...

A body of mass equal to 4 kg is attached to a spring of constant k = 64 N / m. If an external force F (t) = 3/2 cos 4t is applied to the system, determine the position and speed of the body at all times; suppose that the mass was in position x (0) = 0.3 m and, at rest, at time t = 0 s

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