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Physics-

General

Easy

Question

Given $stack R with rightwards arrow on top equals stack A with rightwards arrow on top plus stack B with rightwards arrow on top$ and $R equals A equals B$ . The angle between $stack A with rightwards arrow on top blank a n d stack blank B with rightwards arrow on top$ is

60 $°$
90 $°$
120 $°$
180 $°$

The correct answer is: 120 $degree$

$R to the power of 2 end exponent equals R to the power of 2 end exponent plus R to the power of 2 end exponent plus 2 R to the power of 2 end exponent c o s theta$ or $R to the power of 2 end exponent equals 2 R to the power of 2 end exponent plus 2 R to the power of 2 end exponent c o s theta$
$fraction numerator 1 over denominator 2 end fraction equals 1 plus c o s theta$ or $c o s theta equals negative fraction numerator 1 over denominator 2 end fraction$ or $Error converting from MathML to accessible text.$

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