Assertion : In an elastic collision of two bi | vedclass

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(D) In an elastic collision,the total kinetic energy is conserved throughout the process,including the time of contact. During the collision,kinetic e

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If both the $Assertion$ and $Reason$ are incorrect.

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(D) In an elastic collision,the total kinetic energy is conserved throughout the process,including the time of contact. During the collision,kinetic energy is temporarily converted into elastic potential energy and then back into kinetic energy,so the total mechanical energy remains constant. Thus,the $Assertion$ is incorrect because kinetic energy is not conserved *during* the contact time (it is converted to potential energy).The $Reason$ is also incorrect because the law of conservation of energy is a universal law; energy spent against friction is converted into heat or sound,and the total energy of the system (including heat/sound) remains conserved.

$Assertion$ : 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.

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$Assertion$ : 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.