Force Vector a Has a Length of 5 N and an Angle

Multiple Choice

Force vector A has a length of 5 N and an angle of 30 ^$\circ$ with respect to the positive x-axis.Force vector B has a length of 5 N and an angle of 150 ^$\circ$ with respect to the positive x-axis.What is the magnitude of the third force vector which must be added to A and B in order to make the net force equal to zero? (All three forces act on the same object) .

A) -10 N
B) -5 N
C) 0
D) 5 N
E) 10 N