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If an undamped spring-mass system with a mass that weighs 24 lb and a spring constant...

If an undamped spring-mass system with a mass that weighs 24 lb and a spring constant 9 lbin is suddenly set in motion at t=0 by an external force of 180cos(8t) lb, determine the position of the mass at any time. Assume that g=32 fts2. Solve for u in feet.

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