The radius of circle, the period of revolution, initial position and sense of revolution are indicated in the fig.

y - projection of the radius vector of rotating particle P is:

A

$$y (t) = 4 \sin \left(\frac{\pi t}{2}\right),$$ where y in m

B

$$y (t) = 3 \cos \left(\frac{3 \pi t}{2}\right),$$ where y in m

C

$$y (t) = 3 \cos \left(\frac{\pi t}{2}\right),$$ where y in m

D

$$y (t) = -3 \cos 2 \pi t$$ where y in m