Assertion (A): In an elastic collision of two | vedclass

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(D) In an elastic collision,the total kinetic energy is conserved only before and after the collision. During the short interval of collision,the ball

Vedclass · Accepted Answer

Both $A$ and $R$ are false.

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(D) In an elastic collision,the total kinetic energy is conserved only before and after the collision. During the short interval of collision,the balls undergo deformation,and a part of the kinetic energy is converted into elastic potential energy. Thus,the kinetic energy is not conserved during the contact time.Therefore,the Assertion $(A)$ is false.The law of conservation of energy is a universal law that applies to all physical processes,including work done against friction (where energy is converted into heat). Therefore,the Reason $(R)$ is also false.Since both statements are incorrect,the correct option is $(D)$.

Assertion $(A)$: In an elastic collision of two billiard balls,the total kinetic energy $(KE)$ is conserved during the short time of collision of the balls (i.e.,when they are in contact).
Reason $(R)$: Energy spent against friction does not follow the law of conservation of energy.

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Assertion $(A)$: In an elastic collision of two billiard balls,the total kinetic energy $(KE)$ is conserved during the short time of collision of the balls (i.e.,when they are in contact).Reason $(R)$: Energy spent against friction does not follow the law of conservation of energy.