In an elastic collision between two particles

Options

A. the total kinetic energy of the system is always conserved.
B. the kinetic energy of the system before collision is equal to the kinetic energy of the system after collision.
C. the linear momentum of the system is conserved.
D. the mechanical energy of the system before collision is equal to the mechanical energy of the system after collision.

Answer

B, C, D

Explanation

In a elastic collision, linear momentum of the system ws always conserved i.e., the in all the three stages of collision. But the kinetic energy of the system is not always conserved. It is conserved only before and after the collision. During collision it gets converted into potential energy.