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7 March, 13:01

A rock falls (vi=0) from the top of a 128 m cliff to the ground below.

How long does it take for the rock to fall?

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Answers (1)
  1. 7 March, 13:06
    0
    5.11 s

    Explanation:

    Given:

    v₀ = 0 m/s

    y₀ = 128 m

    y = 0 m

    a = - 9.8 m/s²

    Find: t

    y = y₀ + v₀ t + ½ at²

    (0 m) = (128 m) + (0 m/s) t + ½ (-9.8 m/s²) t²

    t = 5.11 s
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