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The resultant of vectors vec(OA) and vec...

The resultant of vectors `vec(OA) and vec(OB)` is peerpendicular to `vec(OA)`. Find the angle AOB.

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The correct Answer is:
A, B, C
Their x components should be equal and opposite.
`:. 6cos theta = -4`
or ` theta = cos^(-1) (-(2)/(3))`
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