Which of the following quantities could be written in evev ? case a: gravitational potential energy ℎmgh , where mm is the mass of the object, is the acceleration due to gravity (length divided by time squared), and ℎh is the height of the object measured with respect to a reference position case b: electric potential energy δδv , where is the charge of the particle in coulombs and δδv is the potential difference in volts through which the particle is being accelerated case c: rest energy mc2mc2 , where mm is the mass of the object, and cc is the speed of light (length divided by time)