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Homework Help: Finding the minimum time for crossing a river

  1. Dec 29, 2017 #1
    1. The problem statement, all variables and given/known data

    Finding the minimum time for crossing a river

    how is the minimum time crossed by distance between the banks/velocity of swimmer with respect to ground as mentioned in the video?

    2. Relevant equations

    3. The attempt at a solution
    The minimum time is only possible when velocity of man with respect to ground is at angle to the current flow so that he moves perpendicular to the river flow
  2. jcsd
  3. Dec 29, 2017 #2


    Staff: Mentor

    The first thing to do in a problem like this is to write down an equation for the time as a function of the angle. Can you do that?
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