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Three equal masses each of mass 'm' are ...

Three equal masses each of mass 'm' are placed at the three-corner of an equilateral triangle of side 'a'
If the given system of masses placed at three vertices of an equilateral triangle of side a is to be changed to side of 2a, then work done on the system is

A

`(Gm^(2))/(a^(2))`

B

`(4Gm^(2))/(3a^(2))`

C

`(3Gm^(2))/(a^(2))`

D

zero

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The correct Answer is:
A
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