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The three spheres in the figure, with masses mA = 75
g, mB = 9 g, and mc = 23 g, have their centers on a
common line, with L = 23 cm and d = 4 cm. You move
sphere B along the line until its center-to-center
separation from C is d = 4 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 and C?
B
L
·d
C

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