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2015-09-11T15:07:43+05:30

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Let M1 remain same.  M2 and distance d change.

Gravitational force:  Newtons' law:

   F = G M1 M2 / d²    = G M1  M2' / d' ²

   => M2' / M2 = (d' / d)²

given   d' = 5 d       ( or  d' = 6 d  perhaps, it not very clear.  Normally we say distance is increased by a factor of 5  or  increased to 5 times its value..  increased by 5 times means the new value is 6 times old value.)

  M2' = 25 * M2

So the mass of the second object has to be increased by a factor of 25.

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