The coefficient of restitution of a perfectly plastic impact is

Explanation:Coefficient of restitution (e):Coefficient of restitution or coefficient of the resilience of a collision is defined as the ratio of the relative velocity of separation after the collision to the relative velocity of the approach before the collision.Coefficient of restitution (e) =\(\frac{Relative\;velocity\;after\;collosion}{Relative\;velocity\;before\;collosion}=\frac{v_B-v_A}{u_A-u_B}\)A perfectly inelastic collision also called perfectly PLASTIC collision is a limiting case of inelastic collision in which the two BODIES STICK together after impact.Since both bodies stick together in a perfectly plastic collision. Therefore VA = vB, Thus e = 0Properties of different types of collision are given in the table below:Types of CollisionLinear momentumTotal energyKinetic energyCoefficient of restitutionPerfectly elastic collisionConservedConservedConservede = 1Inelastic collisionConservedConservedNot-Conserved0 < e < 1Perfectly inelastic collisionConservedConservedNot-Conservede = 0