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Four particle, each of mass m, are place...

Four particle, each of mass m, are placed at corners of a square of side a in the x-y plane. If the origin of the co-ordinate system is taken at the point fo intersection of the diagonals of the square, the co-ordinates of the centre of mass of the system are:

A

`(a,a)`

B

`(-a,a)`

C

`(a,-a)`

D

`(0,0)`

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