This document describes a 2kg mass oscillating on a vertical spring with a spring constant of 200N/m and completing one oscillation every 2 seconds. An equation of motion is derived using the given information and simple harmonic motion equations. The equation is x(t)=0.14cos(πt+0.775), which models the position of the mass as a function of time t. The intervals when the displacement is negative are (0.253+2n, 1.253+2n) where n is an integer. The maximum velocity achieved by the mass is determined to be ±√2 m/s through an energy analysis.