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Homework Help: Kinematic questions

  1. Sep 17, 2008 #1
    1. The problem statement, all variables and given/known data
    A pilot heads his airplane due east at a speed of 75 m/s. While he is flying, a wind blows at 60 degrees North East with a constant speed of 25 m/s. What is the reultant velocity of the plane?


    2. Relevant equations
    s=(u+v/2)t, v=u+at, and s=ut+1/2at²


    3. The attempt at a solution
    (none as of yet... im completely stumped.... my professor just threw this onto us without giving us any previous info and ive searched everywhere for the answer, textbook, internet and i went to him and he was just like do it yourself)
     
    Last edited: Sep 17, 2008
  2. jcsd
  3. Sep 17, 2008 #2
    Express both velocities as rectangular vectors and use vector addition.
     
  4. Sep 17, 2008 #3
    Draw a vector triangle and use the cosine rule.

    resultant velocity^2 = 75^2 + 25^2 - 2(75)(25) cos 150, in degrees.
     
  5. Sep 17, 2008 #4
    thank you so much mate... this site is a life saver... like a professor here helping me 24/7 much appreciated
     
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