At a instant when a 4.5 kg object has an acceleration equal to ~a = (axˆi + ay ˆ|), where ax = 6.4 m/s2, ay = 2.9 m/s2, one of the two forces acting on the object is known to be ~f1 = (f1xˆi + f1y ˆ|), where f1x = 12 N, f1y = 24 N. Determine the magnitude f2 of the other force acting on the object. Answer in units of N