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1 August, 08:47

A 50-kg student gets in a 1000-kg elevator at rest. As the elevator begins to move, she has an apparent weight of 600 N for the first 3 s. How far has the elevator moved, and in which direction, at the end of 3 s?

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  1. 1 August, 11:27
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    The elevator has moved 54 meters upwards.

    Explanation:

    m = 50kg

    F = 600 N

    t = 3 sec

    a = [F - (m*g) ]/m

    a = (600N-490N) / 50kg

    a = 2.2 m/s²

    h = (a*t²) / 2

    h = (2.2m/s² * (3 sec) ²) / 2

    h = 9.9 m
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