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What should be added in vector `a=3hati+4hatj-2hatk` to get its resultant a unit vector `hati`?

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What should be added in vector `a=3hati+4hatj-2hatk` to get its resultant a unit vector `hati`?
A. `-2hati-4hatj+2hatk`
B. `-2hati+4hatj-2hatk`
C. `2hati+4hatj-2hatk`
D. none of these
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1 Answer

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Correct Answer - A
Let b should be added, then `a+b=hati`
`impliesb=hati-a=hati-(3hati+4hatj-2hatk)`
`=-2hati-4hatj+2hatk`
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