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:
(1) $y(t)=-3\cos2\pi t,$ where y in m
(2) $y(t)=4\sin({\pi t\over2}),$ where y in m
(3) $y(t)=3\cos({3\pi t\over2}),$ where y in m
(4) $y(t)=3\cos({\pi t\over2}),$ where y in m