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One person says that potential energy of...

One person says that potential energy of a particular book kept in an almirah is 20 J and other says it is 30 J. Is one of them necessarily wrong ? Give reasons.

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Two cases will arise in this situation.
Case - I : One of them will be wrong. If both of them kept the book in the same shelf of the almirah.
Case - II : Both of them will be correct. If the first person keeps the book in lower shelf and the second one keeps the book in upper shelf of the almirah.
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