If a =2 i +5 j and b =2 i - j , then unit vector in the direction of a + b is

Mathematics · JEE Main · NTA Exams — Three Dimensional Geometry

1. \(\hat{\mathrm{i}}+\hat{\mathrm{j}}\)
2. \(\sqrt{2}(\hat{\mathrm{i}}+\hat{\mathrm{j}})\)
3. \((\hat{i}+\hat{j}) / \sqrt{2}\)
4. \((\hat{i}-\hat{j}) / \sqrt{2}\)

Answer

(C) ( i + j ) / 2

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