Assertion : In an elastic collision of two billiard balls, the to… - Vidyadip

MCQ

$Assertion$ : In an elastic collision of two billiard balls, the total kinetic 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.

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
✓
If both the Assertion and Reason are incorrect.

✓

Answer

Correct option: D.

If both the Assertion and Reason are incorrect.

d
In an elastic collision, no conversion of energy, so $K.E.$ remains constant during the time of collision. There is no friction acting in this case. In case of friction too conservation of energy is followed provided we take into account all the transformations there.

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