The wheel of radius r rolls without slipping, and its center O has a constant velocity v...

The wheel of radius r rolls without slipping, and its center O has a constant velocity v_O to the right. Determine expressions for the magnitudes of the velocity v and acceleration a of point A on the rim by differentiating its x- and y-coordinates. Represent your results graphically as vectors on your sketch and show that v is the vector sum of two vectors, each of which has a magnitude v_O.