Vector A has a magnitude of 3.0 units and makes an angle of $-90.0^{\circ}$ with the positive x-axis.Vector B has a magnitude of 4.0 units and makes an angle of $-120^{\circ}$ with the positive x-axis.What is the direction of the vector sum of A + B referenced to the positive x-axis?
A) $-107^{\circ}$
B) $55^{\circ}$
C) $-55^{\circ}$
D) $-145^{\circ}$

Question

Quizplus · Accepted Answer

The vector sum of A and B results in a vector with a direction of approximately -107° when calculated using vector addition and trigonometry.

Vector a Has a Magnitude of 3 −90.0∘-90.0^{\circ}−90.0∘ With the Positive X-Axis

Vector a Has a Magnitude of 3 $-90.0^{\circ}$ With the Positive X-Axis