I have two curves/paths (path A and B) and a null point A that follows path A with an arbitrary speed.
I need a null point B that follows the path B but with a speed dependent to null point A x position. In other words, point B must follow the path B but accordingly to point A x position.
As you see in the image, at time 0 and 1, point B has the x position shared with point A while point B y position is on the intersection of the vertical axis, passing trough point A, and path B.
I need an expression for null point B position that can do that.
Thank you for your help.