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Q.
The centre of mass of a body
System of Particles and Rotational Motion
Solution:
The position of centre of mass depend upon (1) its shape and (2) the way mass distributed on its shape. These two factor decide whether centre of mass of gravity lie inside the body or outside the body.
If the solid body has a regular structure and its mass is distributed uniformly over its body (i.e. for symmetrical objects) then its centre of gravity must lie inside the body.
But if solid body have irregular structure and mass is not distributed uniformly then centre of mass may lie inside the body or may outside the body.