1.

If |vecP+vecQ|=|vecP|+|vecQ|. The angle between the vectors vecPandvecQ is

Answer»

<P>`0^(@)`
`180^(@)`
`60^(@)`
`90^(@)`

Solution :Square on both sides and the resultant becomes
`P^(2)+Q^(2)+2PQcostheta=P^(2)+Q^(2)+2PQ`
`costheta=1""0-0^(@)`


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