Question

the work done by gravitational force on the book

Answer 1

heya friend the work done on the book is 0 since the book is not displaced from its initial position

hope it helps u

Answer 2

There is no work done on the book by Gravitational force if it is place on a table or shelf
If the book is freely falling from a height then work is said to be done on the book as work is force * displacement.......................