The Brainliest Answer!
This a famous equation, An equation derived by the profound physicist Albert Einstein,E = mc2 E -units of energy, m -units of mass, and c^2 - speed of light squared.This equation says that mass is just one form of energy, and that mass can be created or destroyed very easily, so long as you convert that mass into another form of energy. Eg nuclear bomb or A bomb,where few ounces (grams) uranium material release MegaTons of energy.
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It  states that the energy ,mass  convertional  relationship if certain  energy  is  used  that  may  or  may nt be  take  enery form wholly  some  enery  may  get lost  through  mass,ligth,heat  etc ....,sooo  what  einstein  say  is  energy is  constant