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(1) According to Archimedes principle: f float = ρ gas gvrow =1.29kg/m3×10n/kg×103 =129n;

(2) Loadable goods: G object =F floating -G ball =F floating-ρ hydrogen gV platoon =129N-0.09/m3×10n /×10m3 =120n;

When it is at rest in the air, it is acted by a balancing force, so the resultant force is zero.

So the answer is:129; 120; 0.