Explain $E = m c^{2}$

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Solution

$E = m c^{2}$
E is the energy of an object at rest, m is the object's mass, and c is the speed of light in vacuum. The equation tells us that energy and mass are, effectively, the same thing, and it also tells us how much energy is contained in a given mass, or vice versa. In other words, mass can be thought of as very tightly packed energy. That energy and mass are equivalent is quite an extraordinary claim and seems to go against two laws that had been established by scientists before Einstein came along:

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