E stands for the energy of the object in question. m stands for it's mass, and c stands for the speed of light in vacuum, ( which is: c = 2.99792458 108 m/s )
Answered by: Anton Skorucak, M.S. Physics, PhysLink.com Creator
'If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.'