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5kg rock is dropped into a well and a splash is heard after 3 seconds , how deep is the well? Ignore air resistance

  • Physics -

    you need to know the speed of sound (v). The total time is time to fall plus time to wait for the sound.

    If the depth is s,

    s = 1/2 gt^2 + v(3-t)
    Plug in g and v and you get s.

    The 5kg is spurious. Time to fall does not depend on mass.

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