The collisions are of two types as,
1. Elastic Collision: It is a collision in which the momentum of the system and net energy of the system before and after the collision remain same.
2. Inelastic Collision: It is a collision in which the momentum of the system before and after the system remain conserved but there is a loss in the energy takes place during the collision. Thus, the energy of the system does not remain conserved before and after the collision.
Hence, the energy of the material is a physical property of the same material that plays an important role in determining if the collision is elastic or not.