1.

The unit vector parallel to the resultant of the vectors `vecA=4hati+3hatj+5hatk` and `vecB=-hati+3hatj-8hatk` is :A. `(1)/(2) [3hati+6hatj-2hatk]`B. `(1)/(7)[3hati+6hatj+2hatk]`C. `(1)/(49)[3hati+6hatj+2hatk]`D. `(1)/(49)[3hati+6hatj-2hatk]`

Answer» Correct Answer - A
`vecR=vecA+vecB=3hati+6hatj-2hatk`
Unit vector parallel to `vecR` is `(vecR=3hati+6hatj-2hatk)/sqrt(3^(2)+6^(2)+2^(2))`
`=(1)/(7)(3hati_6hatj-2hatk)`


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