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The coordinates of the centre of mass of...

The coordinates of the centre of mass of a system of three particles of mass 1g,2g and 3g are (2,2,2). Where should a fourth particle of mass 4 g be positioned so that the centre of mass of the four particle system is at the origin of the three-dimensional coordinate system ?

A

`(1,1,1)`

B

`(2,2,2)`

C

`(3,3,3)`

D

`(-3,-3,-3)`

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The correct Answer is:
D
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