Two balls collide, they are elastic if: a. Total Momentum before and after is the same.
b. Total Kinetic Energy before and after is the same.
c. Total Momentum and Kinetic before and after are the same.
d. Total Potential energy is the same before and after a collision,

C. Total Momentum and Kinetic Energy before and after are the same.

Explanation:

Elastic collisions are collisions in which both momentum and kinetic energy are conserved.

In this type of collision (elastic), there is no net loss in kinetic energy in the system as a result of the collision. Therefore, both momentum and kinetic energy are conserved quantities in elastic collisions.

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the answer would be c