The answer
Imagine energy and mass are the same thing, just in different forms. E=mc² means energy (E) equals mass (m) times the speed of light (c) squared. The speed of light is super fast (300,000 km/s), so even a tiny bit of mass holds a huge amount of energy. Like, the mass in a small paperclip could power a whole city if converted! This is how the sun shines—it turns a little mass into lots of energy. In exams, remember: c is constant, and this formula shows mass can become energy (and vice versa) in nuclear reactions.
