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mechanical engineering theory of machines
1. A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if
(A): all of the above
(B): the centre of gravity of the two masses coincides with that of the body
(C): the sum of mass moment of inertia of the masses about their centre of gravity is equal to the mass moment of inertia of the body
(D): the sum of the two masses is equal to the total mass of body
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