I'm doing a problem on the simple harmonic motion but I didn't understand it really well.
The problem says: "A point describes a simple harmonic motion centered at the origin, the period is T=0.628s. For t = 0 point's position is x=0.15m etc..."
What it means with "harmonic motion is centered at the origin"? I thought that x=0 when t=0 but this is not right apparently.