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Homework Help: Force applied by water

  1. Dec 15, 2009 #1
    At an altitude of 315 m above a lake, a hot-air balloon pilot drops a 2.50 kg sandbag. If the bag comes to a stop 4.50 m below the surface of the lake, what force was applied by the water on it?

    Mass:2.50kg
    velocity: 2.50kg*9.81m/s=61.31?

    I cant remember how to figure out what the time would be?
     
  2. jcsd
  3. Dec 15, 2009 #2

    rock.freak667

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    Homework Helper

    It's easier to use a conservation of energy method. So try that instead
     
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