(a) Centre of gravity (C.G.) of a body is the | vedclass

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(B) The Centre of Gravity $(C.G.)$ is defined as the point where the total gravitational force (weight) of the body acts.$(b)$ The Centre of Mass $(C.

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$(a)$ and $(b)$

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(B) The Centre of Gravity $(C.G.)$ is defined as the point where the total gravitational force (weight) of the body acts.$(b)$ The Centre of Mass $(C.M.)$ and $C.G.$ coincide if the gravitational field is uniform. If the Earth has an infinitely large radius,the gravitational field is uniform,so $(b)$ is correct.$(c)$ For a spherically symmetric body,the mass can be considered concentrated at the $C.G.$ for external gravitational field calculations. However,this is not true for all arbitrary bodies. In the context of standard physics problems,$(a)$ and $(b)$ are the most fundamentally correct statements regarding definitions.$(d)$ The radius of gyration $k$ is defined by $I = mk^2$,where $I$ is the moment of inertia. It is not simply the perpendicular distance from the $C.G.$ to the axis.

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