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Solve the given questions:

Question 1: Determine the gravitational potential energy, in kJ, of 2 m³ of liquid water at an elevation of 30 m above the surface of Earth. The acceleration of gravity is constant at 9.7 m/s2 and the density of the water is uniform at 1000 kg/m³.

Question 2: Determine the change in gravitational potential energy as the elevation decreases by 15 m.

Please show all intermediate steps and formulas for above questions.

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