A pendulum is constructed from a 5 kg mass attached to a strong cord of length 0.9 m also attached to a ceiling. Originally hanging vertically, the mass is pulled aside a small distance of 8.9 cm and released from rest. While the mass is swinging the cord exerts an almost-constant force on it. For this problem, assume the force is constant as the mass swings. How much work in J does the cord do to the mass as the mass swings a distance of 8.0 cm?

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