How does the vertical projection a_y (the y-component of the vector of acceleration a) change in time?

Make measurements for the following experiment, and observe, that the zero values of projections are obtained for the angles of 0^o and 180^o, and the maximal values are for 90^o and 270^o, that is typical for sin function!

Initial Values of Parameters

Radius of circle (R) 5 m

Velocity (V) 5 m/sec