1.

The magnitude of resultant of two vectors acting at an angle of `60^(@)` to each other is `sqrt(21)` units. The first vector has magnitude of 4 units. The magnitude of second vector is _________units.

Answer» Correct Answer - `0001`
`A^(2)+B^(2)+AB=C^(2)`
`16+B^(2)+4B=21`
`B^(2)+4B-5=21`
`B^(2)+5B-B-5=0`
`B(B+5)-1(B+5)=0`
`B=1`


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