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Q.

Assertion : In an elastic collision of two bodies, the momentum and energy of each body is conserved.

Reason : If two bodies stick to each other after colliding, the collision is said to be perfectly elastic.

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a

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

b

If both assertion and 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.
 

answer is D.

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Detailed Solution

In an elastic collision both the momentum and kinetic energy remains conserved. This rule is not for individual bodies but for the centre of mass of the system of bodies before and after the collision.

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