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Homework Help: How deep is the well

  1. Feb 4, 2009 #1
    1. The problem statement, all variables and given/known data

    How deep is the well remember its takes him 3.8 seconds to hear the stone hit the bottom not 3.8 to see it hit the bottom.

    2. Relevant equations

    Not 100% sure what equations to use becuase my teacher goes to quickly

    3. The attempt at a solution

    Would you be able to show me the equations to use to solve it.
    Thanks Nick.
  2. jcsd
  3. Feb 4, 2009 #2
    Try these

    Depth = InitialSpeed*DropTime + 0.5*Acceleration*DropTime²

    SpeedOfSound = Depth/EchoTime

    TotalTime = DropTime + EchoTime
  4. Feb 4, 2009 #3
    Thanks mate, I got 35.28m for the depth of the well, is that correct??
  5. Feb 4, 2009 #4
    Dunno mate! I didn't get that far.
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