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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)/(4)`

B

`(pi)/(2)`

C

`pi`

D

0

Text Solution

Verified by Experts

The correct Answer is:
C
a and b vectors are in the same direction. B and c are in the opposite direction.
`implies`a and c are in opposite directions.
`therefore` Angle between a and c is `pi`.
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