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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. |
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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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