Question

Anyone good at acceleration analysis?

Answer 1

My concern is velocity at C. I think there is a i and j component at C, right?

Answer 2

I assume CD is vertical.

The instantaneous centre of rotation is at O, which is the intersection of AB and DC, and directly higher than C.
Since the point C "appears" to rotate about point O, so its motion is perpendicular to OC, hence horizontal, no j-component. I get Vc=0.253 m/s in +x direction using the instantaneous centre method.