Select the correct answer.
Which statement is true according to the kinetic theory?

The true statement is that different gases with the same mass and temperature always have the same average kinetic energy. This is one of the postulates of the kinetic theory of matter.

If we two objects A and B, they will have mass mA and mB and velocity vA and vB  respectively. If K.E = 1/2mv^2 . Then it follows that

1/2mAvA = 1/2mBvB. Since the mass is the same it means the velocity of the two objects should be the same so that they have the same average kinetic energy.