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The non-zero vectors veca, vecb and vecc...

The non-zero vectors `veca, vecb and vecc` are related by `veca = 8 vecb and vecc=-7 vecb.` Then the angle between `veca and vecc` is :

A

`pi`

B

`0`

C

`pi/4`

D

`pi/2`

Text Solution

Verified by Experts

The correct Answer is:
A
Since, `a=8b and c=-7b`
So, a is parallel to b and c is anti-parallel to b.
`implies a and c` are anti-parallel.
so, the angle between a and c is `pi`.
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