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    Question

    The SI unit of mechanical energy

    is
    A Joule Correct Answer Incorrect Answer
    B Watt Correct Answer Incorrect Answer
    C Newton-second Correct Answer Incorrect Answer
    D Joule-second Correct Answer Incorrect Answer

    Solution

    Mechanical energy is the sum of kinetic and potential energies, and both are measured in Joules (J). A Joule is defined as the work done when a force of 1 Newton displaces an object by 1 meter in the direction of the force.

    • Watt is the unit of power.
    • Newton-second is the unit of momentum.
    • Joule-second relates to Planck's constant but is not used for mechanical energy.

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