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5 November, 23:48

Eric has a mass of 80 kgkg. He is standing on a scale in an elevator that is accelerating downward at 1.7 m/s2m/s2. What is the approximate reading on the scale?

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  1. 6 November, 02:22
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    The answer will be 936 N.

    Explanation:

    Given that

    m = 80 kg

    Acceleration of the elevator, a = 1.7 m/s² (upward)

    The gravity force on the mass = m g

    The reading on the scale = F N

    Now by applying the Newton's second law

    F - m g = ma

    F = m g + m a

    F = m (g + a)

    F = 80 (10 + 1.7) N (take g = 10 m/s²)

    F=80 x 11.7 N

    F = 936 N

    Therefore the reading on the scale will be 936 N.

    The answer will be 936 N.
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