Can Kinetic Energy Be Completely Lost in a Collision?

[TwinGemini14]

It is not possible for a system to lose all of its kinetic energy in a collision.

A) True
B) False

This question seems really tricky, but I believe the answer to be A: true. Even if two identical masses are approaching each other head-on at the same velocity (two billiard balls), when they collide they bounce off each other and continue with KE. Is this right?

 

[LowlyPion]

It is not possible for a system to lose all of its kinetic energy in a collision.

A) True
B) False

This question seems really tricky, but I believe the answer to be A: true. Even if two identical masses are approaching each other head-on at the same velocity (two billiard balls), when they collide they bounce off each other and continue with KE. Is this right?

That is true for elastic collisions.

What about inelastic collisions - say 2 equal balls of damp clay that deform and stick together?