For an elastic collision:

Question

Question

Answer 1

CONCEPT:

Collision: In physics, a collision is an event in which two or more bodies exert forces on each other in a relatively short time.
There are two types of collisions namely:

Elastic Collision	Inelastic Collision
An elastic collision is a type of collision where there is no net loss in kinetic energy in the system as the result of the collision.	An inelastic collision is a type of collision where this is a loss of kinetic energy. The lost kinetic energy is transformed into thermal energy, sound energy, and material deformation
The total kinetic energy is conserved.	The total kinetic energy of the bodies at the beginning and the end of the collision is different.
Momentum is conserved.	Momentum is conserved.
No conversion of energy takes place.	Kinetic energy is changed into other energy such as sound or heat energy.

F1 Jitendra 3.12.20 Pallavi D6.1

EXPLANATION:

From the above, it is clear that in an elastic collision both the kinetic energy and the momentum are conserved. Hence, option 1 is correct.