Posted by mark on Sunday, February 20, 2011 at 6:47pm.
Apply Newton's Universal Law of Gravity and solve for M1*M2.
F = 2.5*10^-10 = G M1*M2/(0.25)^2
Once you know M1*M2 and M1 + M2 (= 4 kg), you can solve for M1 and M2 separately.
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