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Calculating Period of Oscillation of a Mass Spring System

If a mass of 600.0 g is hung from the bottom of a vertical spring, the spring will stretch 28.0 cm. Now the hanging mass is removed, and the spring is placed horizontally on a frictionless table. One end of the spring is held fixed and the other end is attached to a 370.0 g mass. The mass is then pulled out a distance of 14.0 cm from its equilibrium position and released from rest. What is the period of oscillation of this mass/spring system?