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When using the law of conservation to calculate the potential energy of a dam how do I calculate error? For example if a dam has

When using the law of conservation to calculate the potential energy of a dam how do I calculate error?

For example if a dam has PE = mgh =1x10^12 kg x 50m x 10 m/s^2 = 5x10^14 J

how would I calculate and explain error?

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