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A mass attached to a spring oscillates with a period of 1.12·s and an amplitude of...

A mass attached to a spring oscillates with a period of 1.12·s and an amplitude of 40·cm. At time t = 0 the mass is at x = +28·cm and is moving in the positive direction (away from equilibrium). What is the phase constant? (degrees) Where is it at time t = 4.5·s? (cm)

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