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

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.

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

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

Consider the two cases: a. A says that the potential energy of a book placed on a shelf is 10J . b. B says that the potential energy of the same book is -10J . Which one of them is wrong? Justify.

Consider the two cases: a. A says that the potential energy of a book placed on a shelf is 10J . b. B says that the potential energy of the same book is -10J . Which one of them is wrong? Justify.

Consider the two cases: a. A says that the potential energy of a book placed on a shelf is 10J . b. B says that the potential energy of the same book is -10J . Which one of them is wrong? Justify.

The sum of two integers is 20. If one of them is -5 then the other is

The potential energy of a particle executing SHM in its rest position is 15 J . The average kinetic energy of the particle during one oscillation is 5 J . The total energy of the particle is