A ball is thrown horizontally from a cliff and hits the ground 4 seconds later 40 meters from the base of the cliff. How high was the cliff (rounded to the nearest tenth of a meter)?

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  1. height h is given by

    h = h0 - 4.9t^2
    so, to find h0, set h=0

    0 = h0 - 4.9(16)
    h0 = 78.4m

    the horizontal distance is irrelevant to finding the cliff height

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  2. 78.4

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