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In an elastic collision of two billiard ...

In an elastic collision of two billiard balls,which of the 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.

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The correct Answer is:
No
No, KE is not conserved during the short time of collision.
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