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16 October, 02:06

From what height should you drop a ball if you want it to hit the ground in exactly 3 seconds?

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  1. 16 October, 04:06
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    44.1 m

    Explanation:

    Given:

    v₀ = 0 m/s

    a = - 9.8 m/s²

    t = 3 s

    Find: Δy

    Δy = v₀ t + ½ at²

    Δy = (0 m/s) (3 s) + ½ (-9.8 m/s²) (3 s) ²

    Δy = - 44.1 m

    The ball should be dropped from 44.1 meters.
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