The three spheres in Figure with masses mA = 80 g, mB = 10 g, and mC = 20 g, have their centers on a common line, with L = 12 cm and d = 4.0 cm. You move sphere B along the line until its center-to-center separation from C is d = 4.0 cm. How much work is done on sphere B?

(a) By you and

(b) By the net gravitational force on B due to spheres A andC?

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d- B.