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The angles between the two vectors vecA=...

The angles between the two vectors `vecA=3hati+4hatj+5hatk` and `vecB=3hati+4hatj-5hatk` will be

A

zero

B

`180^(@)`

C

`90^(@)`

D

`45^(@)`

Text Solution

Verified by Experts

The correct Answer is:
3
`cos theta = (vecA*vecB)/(AB) = ((3hati+4hatj+5hatk)*(3hati+4hatj-5hatk))/((5sqrt2)(5sqrt2))=0`
`rArr theta = 90^(@)`
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