URGENT: Please help with Physics

Suppose the mass of each of two spherical objects is doubled, and the distance between their centers is three times as large. How is the magnitude of the force of gravity between them affected?
(Points : 5)
It is 4/9 as large.

It is 4/3 as large.

It is 2/9 as large.

It is 3/2 as large.

It is 2/3 as large.

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asked by Jill
  1. initially, F = Gmm/r^2
    later, we have G(2m)(2m)/(3r)^2 = 4/9 F

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    posted by Steve
  2. 3/2

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    posted by Shira

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