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Homework Help: Vector Problems!

  1. Sep 16, 2007 #1
    Here is the problem I can't solve:

    You are given a vector in the xy plane that has a magnitude of 80.0 units and a y component of -60.0 units.

    (a) What are the two possibilities for its x component?

    (b) Assuming the x component is known to be positive, specify the vector which, if you add it to the original one would give a resultant vector that is 70.0 units long and points entirely in the -x direction. (looking for Magnitude + Direction)
  2. jcsd
  3. Sep 16, 2007 #2
    Suppose that a vector has the components x and y, and a magnitude r. What's the equation that links x, y and r?
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