Question

suppose you are reshelving books in a library. you lift a book from the floor to the top shelf . the kinetic energy of t e book from the floor was zero, and the kinetic energy of the book on the top shelf is zero, so there is no change in kineti energy. yet you did some work in lifting the books. is there work energy theorum violated?

Answer 1

Question:

suppose you are reshelving books in a library. you lift a book from the floor to the top shelf . the kinetic energy of the book from the floor was zero, and the kinetic energy of the book on the top shelf is zero, so there is no change in kineti energy. yet you did some work in lifting the books. is there work energy theorem violated?

Answer: No. the work energy theorem is not violated here

Initially when the books are on the floor they do not have any potential energy.
When we do some work on them by lifting them to the top shelf, they obtain potential energy. So the work we have done is stored in the form of potential energy in the books. So the work energy theorem is still valid.