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

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If an undamped spring-mass system with a mass that weighs 24 lb lb and a spring constant 16 is suddenly set in motion at t = 0 by an in external force of 336 cos(12t) lb, determine the position of the mass at any time t. Assume that g = 32 ft $2 Solve for u, where u is in feet and t is in seconds. u(t) = If an undamped spring-mass system with a mass that weighs 24 lb lb and a spring constant 16 is suddenly set in motion at t = 0 by an in external force of 336 cos(12t) lb, determine the position of the mass at any time t. Assume that g = 32 ft $2 Solve for u, where u is in feet and t is in seconds. u(t) =