Why is the CM of a 1 -m length of pipe at its midpoint, whereas this is not true for your arm or leg?
Location of centre of mass depends upon the distribution of mass of the body.
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Center of mass of a body is an imaginary point at which whole mass of the body is supposed to be concentrated.
We consider that the net force acts on the centre of mass of body, insteads of considering that it acts on each and every point on the body for simpler calculation.