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A boat travels down stream, then travels up stream

  1. Sep 7, 2015 #1
    1. The problem statement, all variables and given/known data
    What is the time needed to complete a trip if v = V.

    2. Relevant equations
    t=(2Dv)/v^2-V^2)

    3. The attempt at a solution
    I drew a diagram and tried plugging values in.
     

    Attached Files:

  2. jcsd
  3. Sep 7, 2015 #2

    billy_joule

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    Science Advisor

    Think about what this means.

    Will a boat travel upstream if it's velocity is equal to that of the downstream water?
    Have you ever walked on a treadmill? What speed must you walk at to stay on the treadmill?

    And what was the result?
     
  4. Sep 7, 2015 #3
    Terrible diagram but why don't you attempt am answer?
     
  5. Sep 7, 2015 #4

    phinds

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    Gold Member
    2016 Award

    That's not a helpful description of your calculations. Be more specific
     
  6. Sep 7, 2015 #5
    So the velocity of the boat has to be greater than the velocity of the current when rowing back. I made a force diagram with vectors. I always have problems with problems that don't give numbers... so would v<V?
     
    Last edited: Sep 7, 2015
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