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2. A 32Ib weight is attached to a spring whose spring constant is 4Ib/ft. there is no damping force, but there is a driving force of 10cos3t Ib present. the mass is released from an initial position of 1 ft below the equilibrium position with an initial upward velocity of 2 ft/s. a. Determine the equation of motion. b.What is the natural frequency of the apparatus?

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