The centre of mass of a body

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(B) The centre of mass $(COM)$ of a body is a point where the entire mass of the body is assumed to be concentrated for the purpose of describing its

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May lie within,outside or on the surface of the body

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(B) The centre of mass $(COM)$ of a body is a point where the entire mass of the body is assumed to be concentrated for the purpose of describing its translational motion.For a solid object like a solid sphere,the $COM$ lies within the body.For objects with specific geometries,such as a ring or an $L$-shaped lamina,the $COM$ can lie outside the material of the body.For some objects,the $COM$ may lie on the surface of the body.Therefore,the $COM$ may lie within,outside,or on the surface of the body.

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