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3-1.Vectors
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If $A$ and $B$ are two vectors such that $| A + B |=2| A - B |$ the angle between vectors $A$ and $B$ is
A$45^{\circ}$
B$60^{\circ}$
C$30^{\circ}$
Ddata insufficient
Solution
(d)
$\sqrt{A^2+B^2+2 A B \cos \theta}=2 \sqrt{A^2+B^2-2 A B \cos \theta}$
From this equation, we cannot find $\theta$.
$\sqrt{A^2+B^2+2 A B \cos \theta}=2 \sqrt{A^2+B^2-2 A B \cos \theta}$
From this equation, we cannot find $\theta$.
Standard 11
Physics
