Question

If E=mc², meaning we can't get free energy?

Why do we have to apply energy before energy can be gained??​

Answer 1

Answer:

Explanation:

Energy doesn’t have components, at least in the same way.

Instead, energy is kind of like an accounting phenomenon. It’s a number associated with the state of a physical object or system, not a substance that’s part of a physical object or system. And it’s a useful concept because the total energy of certain systems doesn’t change. Or maybe slightly more generally speaking, if the energy of a system does change, it has to go somewhere or come from somewhere.

Kinetic energy is the idea that energy can “hide” in the form of velocity. The equation E=mc2 simply says that energy can hide in the form of mass.