If all the particles of a system lie in X-Y plane, is it necessary that the centre of mass be in X-Y plane ?

Answers (1)

Yes, if all the particles of a system lie in the X-Y plane, then it's necessary that its centre of mass lies in the X-Y plane.

As we know, 

As all the particles lie in the X-Y plane, their z -coordinates are zero.

Therefore, for the whole system, zcm=0 ; i.e., its centre of mass lies in the X-Y plane.

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