(a) A 5.5 kg particle and a 2.5 kg particle have a gravitational attraction with a magnitude of 2.8 multiplied by 10-12 N. What is the gravitational potential energy of the two-particle system?
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(b) If you triple the separation between the particles, how much work is done by the gravitational force between the particles?
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(c) How much work is done by you?
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