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Three particles of the same mass lie in ...

Three particles of the same mass lie in the x-y plane. The (x,y) coordinates of their positions are (1,1),(2,2) and (3,3) respectively. The (x-y) coordinates of the centre of mass are:

A

(1,2)

B

(2,2)

C

(4,2)

D

(6,6)

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