Posted by Kiley on Sunday, November 2, 2008 at 11:06am.
Add the two vectors. Since they are perpendicular, you can get the magnitude from the Pythagorean theorem.
The ratio 55/225 is the tangent of the resultant ground velocity, angle east of north
How do you add the vectors?
http://www.ac.wwu.edu/~vawter/PhysicsNet/Topics/Vectors/VectorAdditionSteps.html
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