The displacement of the body is the line AB. Using the cosine law, from the triangle △AOB, we can find:
AB2=AO2+BO2−2AB⋅BOcos120°=2R2−2R2cos120° using the trig identity:
cos(180°−α)=−cosα get:
AB2=2R2+2R2cos60°=2R2+2R2⋅21=3R2AB=3R2=R3 Answer. C-R3.
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