1. A collision is said to be inelastic if there is a loss in the kinetic energy during collision, but linear momentum is conserved.
2. In an inelastic collision, m1u1 + m2u2 = m1v1 + m2v2.
3. In an inelastic collision,

4. The loss in kinetic energy is either due to internal friction or vibrational motion of atoms causing heating effect.