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Four uniform spheres, with masses mA=40 ...

Four uniform spheres, with masses `m_A=40 kg, m_B=35 kg , m_C=200 kg` , and `m_D` = 50 kg, have (x,y) coordinates of (0, 50 cm), (0, 0), (–80 cm, 0), and (40 cm, 0), respectively. In unit-vector notation, what is the net gravitational force on sphere B due to the other spheres?

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