In an elastic collision is conserved

in an elastic collision Kinetic energy is conserved

Explanation:

There are two types of collision

1. Elastic collision

2. Inelastic collision

In elastic collision when two objects were collide and separate from each other then after separation the two objects will have no change in their shape and size.

so here in this type of collision the initial total kinetic energy of the system will remain conserved after the collision

While in inelastic collision there is permanent change in shape after collision between two objects due to which some of its kinetic energy is lost in the form of elastic potential energy and hence energy is not conserved in this type of collision

so here correct answer is kinetic energy conserved in elastic collision