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8 May, 11:21

A rock is dropped from a bridge to the water below. It takes 3.2 s for the rock to hit the water. Find the speed (in m/s) of the rock as it hits the water. How high (in m) is the bridge above the water

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  1. 8 May, 12:59
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    Kinematic equations

    v=at. v=9.81x3.2 v=32m/s (approx)

    v^2=2axheight.

    32x32/2x10=height

    16x32/10 = height

    height is approx 48metres
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