Q. 73.8( 5 Votes )
One person says that potential energy of a particular book kept in an almirah is 20 J and other says it is 30J . Is one of them necessarily wrong? Give reasons.
Nobody is wrong. Potential energy of an object depend upon the consideration of zero potential energy.
If we consider ground as zero potential energy lifting a 1kg object to a height of 3m taking g=10 brings the object to 20J potential energy , whereas considering the surface at a vertical height of 1 m above ground as zero potential lifting a 1kg object to 2m makes the potential to 30J.
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