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What does the “m” stand for in E = mc2?

Retry Correct Incorrect The twentieth-century physicist Albert Einstein devised this equation, in which E stands for units of energy, m stands for units of mass, and c2 is the speed of light squared.

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Universal History Archive/Getty Images

Universal History Archive/Getty Images

What does the “m” stand for in E = mc2?

• Millimeter
• Mass
• Meter
• Measurement