1. (3 pts) In each case, three forces act on a 1 kg object to give it the specified acceleration, but only two are shown. Note that the grid has units of 1 N. Draw in the missing vector (F3). Fy (N)1 F1 F2 FA F2 Fx (N) FX (N) FX (N) F, a) b) C) ax = 3 m/s2 ar = -4 m/s2 The object is stationary. ay = -1 m/$2 ay = +3 m/s2