What makes some collisions elastic and others inelastic?

question 17 options:

if the collision involves sticking together, it is elastic.

if there is energy lost in the collision to sound, heat, etc., the collision is inelastic.

if there is no loss of kinetic energy in the collision, it is inelastic.

if the collision involves bouncing, it is elastic.

If there is energy lost in the collision to sound, heat, etc., the collision is inelastic.

Hope this helps

the answer is

If there is energy lost in the collision to sound, heat, etc., the collision is inelastic.

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