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If veca and vecb are two unit vectors su...

If `veca` and `vecb` are two unit vectors such that `veca+2vecb` and `5veca-4vecb` are perpendicular to each other, then the angle between `veca` and `vecb` is

A

`120^(@)`

B

`90^(@)`

C

`60^(@)`

D

`45^(@)`

Text Solution

Verified by Experts

The correct Answer is:
C
`(veca+vec2b).(vec5a-vec4b)=0`
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