Question

The scalar components of the displacement vector are x = -3 m and y = 4 m. Determine the angle that this vector coincides with the positive direction of the x-axis.

Answer 1

$$\tan\theta=\frac{y}{x}$$

$$\theta=\tan^{-1}\frac{y}{x}=\tan^{-1}\frac{4}{-3}=127^{\circ}$$