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5.6k views
in Physics by (54.5k points)

A book is lifted from the floor and is kept in an almirah. One person says that the potential energy of the book is increased by 20 J and the other says it is increased by 30 J. Is one of them necessarily wrong?

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by (65.0k points)
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Yes. Because in this case difference in potential energy depends on the height of the almirah which is fixed. So only one person is right and the other is necessarily wrong.  

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