A vector (\vec{a}) makes equal acute angles on the coordinat... | Mathematics | SolveeIt | Solveeit

Today, August 18

Question

A vector $\vec{a}$ makes equal acute angles on the coordinate axis.Then the projection of vector $\vec{b}=5\hat{i}+7\hat{j}-\hat{k}$ on $\vec{a}$ is

A

$\frac{11}{15}$

B

$\frac{11}{\sqrt3}$

C

$\frac{4}{5}$

D

$\frac{3}{5\sqrt3}$

Answer

$\frac{11}{\sqrt3}$

Explanation

Solution

The correct answer is (B) : $\frac{11}{\sqrt3}$ /