The radius of circle, the period of revolution, initial position and sense of revolution are indicated in the figure.y-projection of the radius vector of rotating particle P is - Sri Chaitanya Infinity Learn Best Online Courses for NCERT Solutions, CBSE, ICSE, JEE, NEET, Olympiad and Class 6 to 12

$ω = \frac{2 π}{4} = \frac{π}{2}$

For y-projection, y = Acos( $ωt$ )

$\Rightarrow y = 3 \cos (\frac{πt}{2})$

The radius of circle, the period of revolution, initial position and sense of revolution are indicated in the figure.
y-projection of the radius vector of rotating particle P is