3) The vertical displacement From its natural length of a spring mass system is described by y" (t) + Ty'Lt) + 12 ylt) = 3, where time t is measured in seconds. using laplace transform solve the DE of the position of the mass after t = 20 seconds If the initial position is y(t) = 0 m/s and initial velocity y'lt) = -1 m/s when E = D.

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