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E=mc² in AP Physics 2
Written by the Fiveable Content Team • Last updated August 2025
Verified for the 2027 exam
Verified for the 2027 exam•Written by the Fiveable Content Team • Last updated August 2025
Definition
E=mc² is Einstein's famous equation that relates energy (E) to mass (m) and the speed of light (c). It states that energy is equal to mass multiplied by the square of the speed of light.
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