All the particles of a body are situated at a distance r from the origin.the distance of centre of mass of body from origin will be-
(a)=r
(b)< or = r

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Originally Posted by SIA MANCHANDANI

All the particles of a body are situated at a distance r from the origin.the distance of centre of mass of body from origin will be-
(a)=r
(b)< or = r

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If you try a couple of examples you should be able to get this. What if there is only one particle, located at x = r? What if there are two particles, one located at x = -r and the other at x=r? What do you conclude?