Discussion
The projection of \( \mathbf{A} = 4\mathbf{a}_x + 3\mathbf{a}_y \) on \( \mathbf{a}_x \) is
Answer: B
The projection on a unit vector is the dot product with it, which picks out the corresponding component. Dividing by the magnitude of the vector would instead give the direction cosine of 0.8, which is a different quantity.
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