A 2.7 kg mass accelerates at 7 m/s^2 in a direction 28 degrees north of east. One of the two forces acting on the mass has a magnitude of 12.6 N and is directed north. Determine the magnitude of the second force. Answer in units of N. I did F2= sqr rt (ma^2+ F1^2) = 22.715 N This is apparently incorrect. This seems too easy and yet I cannot figure it out. I'm assuming F2 is in the positive "x" direction w/o a "y" component. Any help appreciated.