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The vector that must be added to the vec...

The vector that must be added to the vector `hati-3hatj+2hatk` and `3hati+6hatj+7hatk` so that the resultant vector is a unit vector along the y-axis is

A

`4hati +2hatj +5hatk `

B

`-4hati +2hatj +5hatk `

C

`3hati +4hatj +5hatk `

D

Null vector

Text Solution

Verified by Experts

The correct Answer is:
B
(b) `hatj=(hati-3hatj+2hatk)+(3hati+6hatj-7hatk)+C`
`"Here",C=-4hati-2hatj+5hatk`
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