As the figure shows, the ball on the spring moves around the axis.

The spring has a π/6 displacement, 30° amplitude and a period of 8 seconds.

Find a model for simple harmonic motion in the figure.

d=π/6 cos(π/4*t)

d=π/3 cos(π/4*t)

d=π/6 cos(π/2*t)

d=π/3 cos(π/2*t)