Physics
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What is the total gravitational potential energy of this system of masses?
−1.52×10−9-1.52\times10^{-9} J
−3.49×10−8-3.49\times10^{-8} J
−7.78×10−8-7.78\times10^{-8} J
−1.75×10−7-1.75\times10^{-7} J