Notes

Inelastic Collision…

Inelastic Collision – The collision is said to be inelastic, if the bodies do not return to their original form after the collision. In this type of collision, the total linear momentum of the system of bodies will remain conserved, but kinetic energy of the system is not conserved.
i.e. p_initial = p_final ⇒ ∆p = 0
But K_initial ≠ K_final ⇒ ∆K ≠ 0