A girl picks a 0.57 kg book up off the floor and places it on a bookshelf 1 meter above the floor. The book now has 5.6 J of potential energy, how much work did the girl do?

Work done to pull the book upwards is 5.6 J

Explanation:

As we know be the relation of work and potential energy that change in gravitational potential energy of the system is equal to the work done on it

so we will have

when book is placed on the ground then its initial potential energy is given as

final position potential energy is given as

now we have