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Two vectors of equal magnitude 2 are at...

Two vectors of equal magnitude 2 are at an angle of `60^(@)` to each other find magnitude of thei. Sum & difference .

Text Solution

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`|veca + vecb| = sqrt(2^2 + 2^2 + 2 xx 2 xx 2cos 60^@)`
`= sqrt(4+ 4 +4)`

`|veca - vecb| = sqrt(2^2 + 2^2 + 2 xx 2 xx 2cos 120^(@))`
`sqrt(4 + 4 - 4) = 2`
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