Which statement is true for two pieces of iron at the same temperature? The total kinetic energy of their particles is equal.

Heat flows from the larger object to the smaller object.

The average kinetic energy of their particles is the same.

Heat flows from the object with higher potential energy to the object with lower potential energy

A. The average kinetic energy of their particles is the same.

Explanation:

The temperature of an object is proportional to the average kinetic energy of its particles, following the relationship:

E_k = \frac{3}{2}kTEk=23kT

where

E_kEk is the average kinetic energy of the particles

k is the Boltzmann constant

T is the absolute temperature

From this relationship, therefore, we see that the average kinetic energy of the particles in a substance depends only on its temperature: therefore, since the two pieces of iron have same temperature, they also have same average kinetic energy.