Final answer:
As the electric potential energy of a charged object decreases, its kinetic energy increases.
Step-by-step explanation:
When a charged object moves freely in an electric field, as its electric potential energy decreases, its kinetic energy increases.
As the charge moves in the electric field, the force due to the electric field accelerates it, causing its potential energy to be converted into kinetic energy. This is similar to how a mass falls in a gravitational field, where the potential energy decreases and the kinetic energy increases.
Therefore, as the electric potential energy of the charged object decreases, its kinetic energy increases.