There are two forces on the 2.13 kg box in the overhead view of the figure but only one is shown. For F1 = 26.7 N, a = 14.5 m/s2, and ? = 31.1°, find the second force
(a) in unit-vector notation and as
(b) a magnitude and
(c) a direction. (State the direction as a negative angle measured from the +x direction.)