Posted by **Ray** on Tuesday, September 20, 2011 at 7:28pm.

You are given a vector in the xy plane that has a magnitude of 70.0 units and a y component of -55.0 units. What are the two possibilites for its x component? Please explain, thanks! :)

- Physics -
**bobpursley**, Tuesday, September 20, 2011 at 7:29pm
x^2=70^2-55^2

x= +- sqrt above.

- Physics -
**Ray**, Tuesday, September 20, 2011 at 7:40pm
Thanks so much! I should have thought of the pythagorean therom, but why x^2=70^2-55^2 rather than x^2+(-55^2)=70^2?

- Physics -
**bobpursley**, Tuesday, September 20, 2011 at 7:50pm
They both are the same thing. Solve for x^2 in your equation...

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