An object stretches a spring 6 inches in equilibrium. a) Find its displacement for t > 0 if it is initially displaced 4 inches below equilibrium and given an upward velocity of 8 ft/s. y(t) = = b) State the natural frequency of the oscillation. Wo = rad/s c) State the period of the oscillation. T = S d) State the amplitude of the oscillation. R ft = e) State the phase angle of the oscillation. The phase angle should be between π radians. Notes: rad π and 1. Use g = 32 ft/s². 2. Assume there is no damping in the system and displacement and velocity are positive upward.

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