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Homework Help: Relativity Question

  1. Feb 13, 2010 #1
    1. The problem statement, all variables and given/known data
    An airplane has a velocity relative to the air of 189 m/s in a westerly direction. If the wind has a speed relative to the ground of 50 m/s directed to the north, what is the speed of the plane relative to the ground?

    2. Relevant equations
    I'm not entirely sure..

    3. The attempt at a solution
    I figured speed of plane relative to the ground = speed of plane relative to the air + speed of air relative to ground.
    So I put in x=189+50
    Our homeworks are put online, and I already found out this answer was wrong.

    If anyone could help that'd be great! thanks!
  2. jcsd
  3. Feb 13, 2010 #2
    I would just add them vectorially, were the plane's velocity relative to the ground.. I'm not sure what they mean exactly by relative to the air, considering the vectors are perpendicular.
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