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.For a solid object like a solid sphere,the

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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.For a solid object like a solid sphere,the $COM$ lies within the body.For objects like a ring or a hollow sphere,the $COM$ lies at the geometric centre,which is outside the material of the body.For objects like an $L$-shaped lamina,the $COM$ may lie on the surface or even outside the physical boundaries of the object.Therefore,the centre of mass may lie within,outside,or on the surface of the body.

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