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The resultant of two velocity vectors ve...

The resultant of two velocity vectors `vec(A)` and `vec(B)` is perpendicular to `vec(A)`. Magnitude of Resultant `vec(R )` is equal to half magnitude of `vec(B)`. If the angle between `vec(A)` and `vec(B)` is `(30 theta)^(@)`, then value of `theta` is ?

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The correct Answer is:
5

`sin alpha = (B//2)/(B) = (1)/(2)`
`alpha = 30^(@)`
`theta = 150^(@)`
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