1.

If |vecP+vecQ|=|vecP|-|vecQ|, the the angle between the vectors vecPandvecQ

Answer»

<P>`0^(@)`
`90^(@)`
`180^(@)`
`360^(@)`

Solution :Square on both side `180^(@)` and the resultant BECOMES
`P^(2)+Q^(2)+2PQcostheta=P^(2)+Q^(2)-2PQ`
`costheta=-1""theta=180^(@)`


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