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Three point masses are at the corners of...

Three point masses are at the corners of an equilateral traingle of side `r`. Their separations do not change when the system rotates about the centre of the triangle. For this, the time period of rotation must be proportional to

A

`a^(3//2)`

B

`a`

C

`m`

D

`m^(-1//2)`

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The correct Answer is:
A, D
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