In this case, the sky diver has a mass of 64 kg, the acceleration due to gravity is 9.8 m/s$^2$, and the height is 0.90 km. Therefore, the potential energy at the initial altitude is:
$PE = (64 \mathrm{kg})(9.8 \mathrm{m/s^2})(0.90 \mathrm{km}) = 564.48
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