Hi jersmi well spotted on the collision detection on the RHS paddle. I'll go back to this and make the paddles move more smoothly. I could also have sub-patched the composition and arrange nodes more clearly I guess. I appreciate your feedback and challenges to help me learn..
Here's a bouncing ball without using the Curve node so that the vectors location and velocity can be used and seen in the composition. There is symmetry within my composition which suggests that it could be simplified. Any help or improvements appreciated.