First slide
The steps in collision
Question

Assertion : There is no loss in energy in elastic collision.
Reason : Linear momentum is conserved in elastic collision. [AIIMS 2019)

Easy
Solution

In elastic collision, total energy, kinetic energy and momentum remain conserved, therefore no loss in energy
occurs in elastic collision.
Hence, both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

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