Answer with reason: In an elastic collision of two billiard balls, is the total kinetic energy conserved during the short time ofcollision of the balls (i.e., when they are in contact )?

Answer with reason: In an elastic collision of two billiard balls, is

1.	Answer with reason: In an elastic collision of two billiard balls, is the total kinetic energy conserved during the short time ofcollision of the balls (i.e., when they are in contact )?
Answer» SOLUTION :The collision produces a SLIGHT deformation of both the balls. A partof the KE is used for that deformation , so the total KE is not CONSERVED during the short time of collision. However,due to the elastic stress DEVELOPED in the perfectly elastic balls, the kinetic ENERGY is regained after the collision.