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There are two common forms ofthe equations used to model simple harmonic motion (SHM), which is the motion of springs, swings, tides, and many other periodic phenomena. These equations are y (t) = A sin(wt + ()5) and y (t) = 623111 wt + 51608 wt, where: y(t) = distance of weight from equilibrium position a.) : angular frequency (measured in radians per second) A = amplitude