Question

Assertion :In elastic collision, kinetic energy is conserved. Reason: Energy is always conserved.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
• C. Assertion is correct but Reason is incorrect.
• D. Both Assertion and Reason are incorrect.

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

Reason is correct because, the law of conservation of energy is always valid as long as all forms of energy are considered.

Assertion is also correct because in elastic collision, no permanent deformation of the colliding objects takes place. In an elastic collision, the deormations are fully recovered. So no potential energy is stored in the form of deformation. In elastic collision, kinetic energy of colliding bodies is not converted into other forms of energy (such as light, sound, heat, etc.).

Thus, both assertion and reason are correct but reason is not the correct explanation for assertion.