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A mass weighing 20 pounds stretches a spring 6 inches. The mass is initially released from...

A mass weighing 20 pounds stretches a spring 6 inches. The mass is initially released from rest from a point 4 inches below the equilibrium position.

(a) Find the position x of the mass at the times t = pi/12, pi/8, pi/6, pi/4, and 9pi/32 s. Use g = 32 ft/s^2 for the acceleration due to gravity.
(b) what is the velocity of the mass when t = 3pi/16 s?

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