I can't seem to figure this problem out... Three forces in the x-y plane act on a 3.70 kg mass: 14.50 N directed at 478.0°, 11.00 N directed at 117.0°, and 10.70 N directed at 222.0°. All angles are measured from the positive x-axis, with positive angles in the counter-clockwise direction. Calculate the magnitude of the acceleration. I am not sure what I am doing wrong here. I am adding the x components and y components of the 3 forces then I am finding the resultant vector. Next I take that and divide it by the mass to get the acceleration, using Newtons 2nd Law.....Is that not right?