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avatarAlligatorTurquoise1170
Secondaire 3 • 2a

Why is the speed of light squared in E =mc²

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  • Explication d'Alloprof

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      avatarKylan Tteacher check
      Équipe Alloprof • 2a

      Hi AlligatorTurquoise,

      Thanks for your question!

      This is simply a matter of units. Energy (E) is measured in Joules (J), which is the same as kg m^2 s^-2. Mass (m) is measured in kg.

      m^2 s^-2 is the same as m^2/s^2, which is m/s squared (the squared speed, thus the c^2 instead of simply c).

      Therefore: E = mc^2 -> kg m^2 s^-2 = kg m^2 s^-2. The units are all the same each side of the equation.

      You cas check out this web page if you need more information:

      https://www.wikihow.com/Understand-E%3Dmc2

      Don't hesitate to reach out again if needed:)

      Kylan

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