What vector must be added to the two vectors $\hat i - 2\hat j + 2\hat k$ and $2\hat i + \hat j - \hat k,$ so that the resultant may be a unit vector along $X-$axis
What vector must be added to the two vectors $\hat i - 2\hat j + 2\hat k$ and $2\hat i + \hat j - \hat k,$ so that the resultant may be a unit vector along $X-$axis
- A
$2\hat i + \hat j - \hat k$
- B
$ - 2\hat i + \hat j - \hat k$
- C
$2\hat i - \hat j + \hat k$
- D
$ - 2\hat i - \hat j - \hat k$
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- [JEE MAIN 2019]