Can somebody please help me? I would like to calculate a circle's two xy velocities after collision with another circle, so I set up this simulation. If you'd like to run the code in the screenshot, download [5SNEE3KJ] If anybody can solve this I will be eternally grateful, this is the one algorithm that I have been avoiding... I am clueless.

Could you download M3XNNEKY and refer to EX_CIRCOL1 or EX_CIRCOL2. EX_CIRCOL2 is physically stricter than EX_CIRCOL1.

Yes yes thank you Hanzo!

Hanzo do you think you could explain how your solution EX_CIRCOL2 works?

I think my English vocabulary is not enough to explain it, but I'll make efforts. #1: When an impact is applied, rotate circle 1 around circle 2 with velocity vectors until the line connecting center of circle 1 with circle 2 overlaps X axis. #2: Swap X components of velocity vectors of 2 circles. #3: Restore #1 to original status.

Could you download B5E3C3QV and refer to EX_CIRCOL2E? It explains the process to calculate velocity vectors after collision.