A mass of 361 grams is hung from the bottom of a vertical spring and the spring stretches 64.3 cm. 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 649 gm mass. The 649 gm mass is then pulled to a distance of 64.3 cm and released from rest. What is the period of oscillation of this mass/spring system? Just starting these types of SHM problems. How do I go about solving this?