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23 January, 18:53

11. You want to calculate the displacement of an object thrown over a bridge. Using - 10 m/s2 for acceleration due to gravity, what would be the total displacement of the object if it took 8 seconds before hitting the water?

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  1. 23 January, 19:01
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    Displacement is d

    Vf² = Vi² + 2 g d

    (-20²) = (+10²) + 2 (-9.8) d

    -19.6 d = 300

    d = - 15.3 m

    negative means lower

    time is t

    d = Vi t + 1/2 g t²

    -15.3 = 10 t + (-4.9) t²

    4.9 t² - 10 t - 15.3 = 0

    t = 3.06 s
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