A large number of energetic cosmic-ray particles reach Earth's atmosphere continuously and knock electrons out of the molecules in the air. Once an electron is released, it responds to an electrostatic force that is due to an electric field produced in the atmosphere by other point charges. Near the surface of the earth this electric field has a magnitude of 150N/C and is directed downward. Calculate the change in electric potential energy of a released electron when is moves vertically upward through a distance d=650m.