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7.
An object of a mass of 2 Kgs is attached to a spring having spring constant k = 32 N/m.
When the system comes to rest in equilibrium position, att = 0, we apply an external force
F(t) = 68 e-ª cos 4t to the system, which is assumed to be undamped. Determine the motion
of the system.
[y(t) = } (e -24 –1) cos 4t + G– 2e-24 ) sin 4t]

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