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Mass M is split into two parts m and (M-...

Mass `M` is split into two parts `m` and `(M-m)`, which are then separated by a certain distance. What is the ratio of `(m//M)` which maximises the gravitational force between the parts ?

A

`2//3`

B

`3//4`

C

`1//2`

D

`1//3`

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