I'm making a billiard game and I have two questions:

How do I find the velocity of two balls when they collide with each other and how do I apply it to both balls  ?

I already know the angles that they're gonna move, I just need to find the velocity that they'll move in those directions.

I was never good at physics/physics programming so I would appreciate any help given! Btw, my game is in 3D.

Thank you for your time!

I'm making a billiard game and I have two questions:

How do I find the velocity of two balls when they collide with each other and how do I apply it to both balls?

I already know the angles that they're gonna move, I just need to find the velocity that they'll move in those directions.

My game is in 3D, and I'm using Unity. I don't want to use Unity's built-in physics to compute the result in this case, I'd like to know how to compute it myself.