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The potential energy of the rocks can be calculated using the formula PE = mgh, where m is the mass (100 kg), g is the acceleration due to gravity (9.8 m/s^2), and h is the height (50 m). Therefore, the potential energy of the rocks is PE = 100 kg * 9.8 m/s^2 * 50 m = 49,000 Joules.

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