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A mass M at rest is broken into two piec...

A mass M at rest is broken into two pieces having masses m and (M-m). The two masses are then separated by a distance r. The gravitational force between them will be the maximum when the ratio of the masses [m: (M-m)] of the two parts is

A

`1 :1`

B

`1: 2`

C

`1: 3`

D

`1: 4`

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