Although linear momentum is conserved in every isolated collision
PHYSICS · Multi-part · CBSE · Physics · Work, Energy and Power · Work, Energy and Power
Problem
Although linear momentum is conserved in every isolated collision, kinetic energy is not necessarily conserved. Answer the following with appropriate reasoning and, where necessary, supporting algebra.
(i) Explain, without using numerical calculation, why kinetic energy cannot increase in a perfectly inelastic collision between two bodies on a frictionless line.
(ii) Describe qualitatively how the coefficient of restitution governs the amount of kinetic energy retained after a collision.
(iii) A student claims that by choosing suitable masses and initial velocities it is possible for the final kinetic energy of the system to exceed the initial kinetic energy even when e<1. Identify the flaw in this argument and justify your answer.