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    How much do you know about Mechanical Aptitude?

    In a horizontal displacement, if constant kinetic friction acts opposite the movement, the work of the friction is:

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    Positivo, porque empuja
    Negative, because it dissipates energyCorrect
    Cero, porque es horizontal
    Indeterminate, because it depends on the mass

    Friction does negative work: W = −f_k·d if it opposes displacement, converting mechanical energy into heat.

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