_). Three forces are applied to an object, as shown in the gure. Force F1 has a magnitude of 24.3 newtons (24.3 N) and is directed 30.0 ) to the left of the +3; axis. Force F; has a magnitude of 15.6 N and points along the +x axis. What must be the (a) magnitude and (b) > direction (specied by the angle 6 in the drawing) of the third force F3 such that the vector sum of the three forces is 0 N? (a) Number n Units v (b) Number n Units V