일반물리학 1 — Vectors: Problem 11

11 (a) In unit-vector notation, what is the sum \(\vec{a} + \vec{b}\) if \(\vec{a} = (4.0 \text{ m})\hat{i} + (3.0 \text{ m})\hat{j}\) and \(\vec{b} = (-13.0 \text{ m})\hat{i} + (7.0 \text{ m})\hat{j}\)? What are the (b) magnitude and (c) direction of \(\vec{a} + \vec{b}\)?