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The gravitational force between two obje...

The gravitational force between two object is F.How will this force change when
(i)distance between them is reduced to half?
(ii) the mass of each object is quadrupled?

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Force of gravitation, `F=(Gm_(1)m_(2))/r^(2)`.
When distance between the objects, i.e., r is reduced to half `(r//2)`, force F would become 4 times.
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