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The essential condition of placing the two masses, so that the system becomes dynamically equivalent, is (where l₁ and l₂ = Distance of two masses from the centre of gravity of the body, and kG = Radius of gyration of the body)

A. l₁ = kG

B. l₂ = kG

C. l₁l₂ = kG

D. l₁l₂ = kG²

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