This transformed energy may appear as kinetic energy. \(m\) is the mass of the object in kilograms (\(kg\)) and \(v\) is the speed of the object in metres per second (\(m\,s^{-1}\)).

When an electron is ejected from a metal surface it has kinetic energy. The amount of kinetic energy the electron has depends on the difference between the energy of the photon and the work ...