일반물리학 1 — Vectors: Problem 18

18 In the sum \(\vec{A} + \vec{B} = \vec{C}\), vector \(\vec{A}\) has a magnitude of \(12.0 \text{ m}\) and is angled \(40.0^\circ\) counterclockwise from the \(+x\) direction, and vector \(\vec{C}\) has a magnitude of \(16.0 \text{ m}\) and is angled \(20.0^\circ\) counterclockwise from the \(-x\) direction. What are (a) the magnitude and (b) the angle (relative to \(+x\)) of \(\vec{B}\)?