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Simple Vector problem agian

  1. Sep 19, 2009 #1
    The unit vector that has the same direction as the vector from the point A=(2,2) to the point B=(4,0) is?

    I chose to find the length so that would be A-B right?
    I got (-2,2) as the vector between the two points.
    I found its magnitude which was 2, then I divided the vector <-2,2> so it'll be a unit vector.

    My answer was <-1,1> but I'm wrong.
     
  2. jcsd
  3. Sep 19, 2009 #2
    You're pretty close

    Magnitude = sqrt(deltaX^2 + deltaX^2) <> 2

    And you want the vector going in the direction that would get you from a to b. So you want to subtract b-a to get the direction
     
  4. Sep 19, 2009 #3
    Ahah, Thank you

    Sometimes my mind keeps flipping numbers around and the strange thing is I repeat the same mistakes over and over its like a disease or something haha.

    Thanks,

    Ray
     
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