Posted by Ariza on Tuesday, May 4, 2010 at 5:44pm.
Did you make a diagram?
I drew the 20 N line, and at its end drew the 50 N line with an angle of 120° between them.
(you should be familiar with the parallelogram resulting from the addition of 2 vectors with the diagonal representing the resultant R)
|R|^2 = 50^2 + 20^2 - 2(50)(20)cos 120°
= 2500 + 400 - 2000(-1/2)
= 3900
|R| = √3900 = appr. 62.45 N
now you can use the Sine Law to find the angle between either vector and the resultant.
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