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Physics-

General

Easy

Question

The sum of two vectors $stack A with rightwards arrow on top$ and $stack B with rightwards arrow on top$ is at right angles to their difference. Then

$A = B$
$A = 2 B$
$B = 2 A$
$\vec{A}$ and $\vec{B}$ have the same direction

The correct answer is: $A equals B$

$open parentheses stack A with rightwards arrow on top plus stack B with rightwards arrow on top close parentheses bullet open parentheses stack A with rightwards arrow on top minus stack B with rightwards arrow on top close parentheses equals 0$
$A to the power of 2 end exponent minus B to the power of 2 end exponent equals 0$ or $A equals B$ .

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