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