15.2: Simple Harmonic Motion - Physics LibreTexts The velocity is not v = 0.00 m/s at time t = 0.00 s, as evident by the slope of the graph of position versus time, which is not zero at the initial time. The data in Figure \(\PageIndex{6}\) can still be modeled with a periodic function, like a cosine function, but the function is shifted to the right.