what is not conserved in inelastic collision

In an inelastic collision, the kinetic energy is not conserved. This is because some of the kinetic energy is transferred to something else, such as thermal energy, sound energy, or material deformation. While momentum of the system is conserved in an inelastic collision, kinetic energy is not. The loss of kinetic energy is due to internal friction. In a perfectly inelastic collision, the colliding particles stick together, and the maximum amount of kinetic energy is lost. Therefore, the total kinetic energy before the collision is not equal to the total kinetic energy after the collision.