Question

At what angle do billiard balls scatter if they collide off center?

Answer 1

The spheres are hard and friction is ignored. I've tried googling a lot. All of the examples include the final angle as given.

Answer 2

There is friction between the balls and between each ball and the felt. The incident ball may or may not be rolling without slipping. Even if the incident ball was rolling without slipping, both balls may be slipping after the collision.

HOPE IT HELPS ✌