1.

If `vecA+veB` is a unit vector along x-axis and `vecA=hati-hatj+hatk`, then what is `vecB`?A. `hatj+hatk`B. `hatj+hatk`C. `hati+hatj+hatk`D. `hati+hatj-hatk`

Answer» Correct Answer - B
`vecA+vecB=hati`
`vecB=hati-vecA=jati(hati-hatj+hatk)-hatj-hatk`


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