Four particles of mass 5,3,2,4 kg are at...

Four particles of mass `5,3,2,4 kg` are at the points `(1,6),(-1,5),(2,-3),(-1,-4)` . Find the coordinates of their centre of mass.

`(2,7,23/4)`

`(1/7,23/4)`

`(2/7,11/4)`

`(1/7,23/3)`

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