Consider a system consisting of three masses on the x axis. Mass m_1 = 1.10 kg
is at x_1 = 1.00 m;
mass m_2 = 1.80 kg
is at x_2 = 1.90 m;
and mass m_3 = 3.30 kg
is at x_3 = 3.40 m.
What is the total gravitational potential energy of thissystem?

I dont' understand it the answer given below was not clear..


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