What is true about kinetic energy?

Question

Molecules within a substance have kinetic energy when that substance moves.

Molecules of liquids and gases are in constant motion, so they have kinetic energy.

Cold molecules have potential energy but no kinetic energy, as kinetic energy is experienced as heat.

All molecules are in constant motion, so they all have some kinetic energy.

Answer 1

Molecules of liquids and gases are in constant motion, so they have kinetic energy.