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The non-zero vectors are vec a,vec b an...

The non-zero vectors are `vec a,vec b and vec c` are related by `vec a= 8vec b and vec c = -7vec b`. Then the angle between `vec a and vec c` 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
`therefore` a is parallel to b and c is anti-parallel to b.
`implies `a and c are anti-parallel
`implies` Angle between a and c is `pi`.
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