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20 November, 18:55

A firewoman dropped a person onto the safety net. Right before the person hit the net he had a

velocity of 11.2 m/s and 1800 J of kinetic energy. What was the mass of the person?

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  1. 20 November, 20:11
    0
    The Mass of a person is calculated to be 28.6kg.

    Explanation:

    This is based on Kinetic energy and we know, that Kinetic energy is the energy possessed by body by virtue of its motion.

    It can be calculated by expression:

    K. E=1/2mv²

    Velocity of a person = 11.2m/sec

    Kinetic energy = 1800J

    Mass of person = ?

    We know,

    K. E=1/2mv²

    so, putting values we have:

    1800=1/2 x m x (11.2) ²

    That is,

    m=1800 x 2 / 11.2 x 11.2

    or

    m=3600/125.44

    m = 28.6 kg
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