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