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A coyote chases a rabbit basic vector problem

  1. Sep 27, 2011 #1
    A coyote chasing a rabbit is moving 8.00 due east at one moment and 8.80 due south 3.80 later. Find the direction of the coyote’s average acceleration during that time (west of due south)?


    i found Ax = -2.11 and Ay = -2.32. i used the theta = arctan(Ay/Ax) formula and got 47.7 but that isnt the right answer. am i using the wrong formula or am i in the wrong quadrant?
     
  2. jcsd
  3. Sep 27, 2011 #2

    PeterO

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    Actually you want arctan(Ax/Ay) since they asked for the angle West of South, not the direction South of West.

    EDIT: A diagram would have helped.
     
  4. Sep 27, 2011 #3
    can anyone else confirm this is true?
     
  5. Sep 27, 2011 #4

    PeterO

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    I mean a diagram of the two vectors would have helped you see which angle you were after.
     
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