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    Physics A-Level

    Conservation of energy including rest energy

    What Conservation of energy including rest energy means in Physics A-Level, as defined for AQA.

    Definition of Conservation of energy including rest energy

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    Reference: AQA

    The total energy of the system remains constant in any interaction, and this includes rest energy, so a decrease in rest mass appears as an increase in kinetic energy or as photon energy.
    AQA · Applications of conservation laws (study guide)

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