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The projection of the vector $\mathbf{i}+\mathbf{j}+\mathbf{k}$ along the vector $\mathbf{j}$ is
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Projection of the vector $\mathbf{i}+\mathbf{j}+\mathbf{k}$ along vector
$\mathbf{j}=\frac{(\mathbf{i}+\mathbf{j}+\mathbf{k}) \cdot \mathbf{j}}{|\mathbf{j}|}=\frac{1}{1}=1 .$
$\mathbf{j}=\frac{(\mathbf{i}+\mathbf{j}+\mathbf{k}) \cdot \mathbf{j}}{|\mathbf{j}|}=\frac{1}{1}=1 .$
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