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College Physics

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A rock is dropped from a sea cliff and the sound of it striking the ocean is heard 6.4 s later. If the speed of sound is 340 m/s, how high is the cliff?

  • College Physics -

    The time of 6.4 s is the sum of the time required for the rock to hit the sea, sqrt (2H/g), and the time for the sound to get back, (H/V).
    H = cliff height
    V = speed of sound
    g = acceleration of gravity

    Solve this equation for H:

    6.4 = H/340 + sqrt(H/4.9)

    That can be turned into a quadratic equation. Only one root will be positive.

  • College Physics -


  • College Physics -


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