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Assertion: In an elasticcollision of two...

Assertion: In an elasticcollision of two billard balls, the total `KE` is conservation during the short times of collision of the balls`(i.e., when they are in constant).
Reason: Energy spend against friction does not follow the law of conservation of energy.

A

If both assertion and reason are true and reason is the true explanation of assertion.

B

If both assertion and reason are reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
A
(a) Since the balls are in contact in the deformed state their total energy is in the form of potential energy and kinetic energy, so kinetic energy is less than the total energy. The energy spent against friction is dissipated in the form of heat which is not available for doing work.
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Assertion : In an elastic collision of two billiard balls, the total knetic energy is conserved during the short time of oscillation of the balls ( i.e. when they are in contact ) . Reason : Energy spent against friction does not follow the law of conservation of energy .

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