During bond formation, potential energy of the system

During the formation of a chemical bond potential energy of the system

According to the valence bond theory, when a covalent bond is formed between two reacting atoms, the potential energy of the system becomes

There will be decrease in potential energy of the system, if work is done upon the system by

Change in potential energy of the system is equal to

The formation of a chemical involves an increase in the potential energy of the system.

A particle moving with kinetic energy K makes a head on elastic collision with an identical particle at rest. Find the maximum elastic potential energy of the system during collision.