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Homework Statement
Determine the magnitude of the projection of force F = 700N along the u axis.
Homework Equations
Cosθ = (A • B)/(||A|| * ||B||)
The Attempt at a Solution
I'm guessing I have to use the above equation, but my problem is finding the B vector. A is easy enough (<-2, 4, 4> I believe), but what about that B? Or am I thinking of this in the wrong way?