1.

When vec(A).vec(B)=-|A|.|B| then :

Answer»

`vec(A)` and `vec(B)` are PERPENDICULAR to each other
`vec(A)` and `vec(B)` act in the same direction
`vec(A)` and `vec(B)` act in the opposite direction
`vec(A)` and `vec(B)` can act in any direction

Solution :Here `Abcostheta=(|A|)(|B|)=-AB`
`costheta=-1, theta=180^@`
`vec(A)` and `vec(B)` are opposite to each other.


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