Question

Three particles m, 2m and 4m are placed on print (a,2a), (2a,a) and (a,a) respectively. Where should the
fourth particles of mass m be kept on x-y plane such that the centre of mass will lie on origin.
a) (9a,8a)
b) (8a,9a)
c) (-8a,-9a)
d) (-9a,-8a)
Can anyone EXPLAIN this answer please?? I need it now ​

Answer 1

Answer:

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Explanation: