The centre of mass of a body

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(B) The centre of mass $(COM)$ is a point that represents the average position of all the mass in a system.It does not necessarily have to be located

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

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(B) The centre of mass $(COM)$ is a point that represents the average position of all the mass in a system.It does not necessarily have to be located within the physical material of the object.For a solid sphere,the $COM$ lies within the body.For a hollow object or a ring,the $COM$ lies outside the body.For certain shapes like an $L$-shaped lamina,the $COM$ may lie on the surface or even outside the material.Therefore,the $COM$ may lie within,outside,or on the surface of the body.

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