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The vector projection of 3a - b onto a - 3b is the one I labelled in red on the left hand side.

But the length of that projection is a scalar (length is a scalar, independent of the direction). So using the scalar projection formula is sufficient for this question.

But the length of that projection is a scalar (length is a scalar, independent of the direction). So using the scalar projection formula is sufficient for this question.

Date Posted:
4 months ago

Also, cos 60 = half.

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I have no idea how to calculate modulus part so I am guessing here. I only know how to do first part. Sorry.

Date Posted:
4 months ago