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  • In an elastic collision of two billiard balls, which of the following quantities remain conserved during the short time of collision of the balls (i.e., when they are in contact).(a) Kinetic energy.(b) Total linear momentum? Give reason for your answer

In an elastic collision of two billiard balls, which of the following quantities remain conserved during the short time of collision of the balls (i.e., when they are in contact).
(a) Kinetic energy.
(b) Total linear momentum?
Give reason for your answer in each case.

Answers (1)

In the given case of the question, when two balls collide with each other, both; the Kinetic energy, as well as the total linear momentum, remains conserved. There is no presence of any non-conservative force like friction, electrostatic force, etc. in this case and also the balls do not get deformed upon collision; hence both of them remain conserved. If there is a deformation of the ball then the kinetic energy is not conserved but the total energy is conserved. 

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