Two ball at the same temperature collide which is consved?

Two balls at the same temperature collide. What is conserved?

Two balls at the same temperature collide inelastically. Which of the following is not conserved? (1) Kinetic energy (2) Velocity (3) Temperature (4) Momentum

There are two spherical balls A and B of the same material with same surface, but the diameter of A is half that of B . If A and B are heated to the same temperature and then allowed to cool, then