Astudent lifts a set of books off a table and places them in the upper shelf of a book case which is 2 meters above the table. if she applies a force of 5 newtons to lift these books, what is the work done? 0 joules 2.5 joules -2.5 joules 10 joules -10 joules

The work done is the product between the intensity of the force applied F, the amount of the displacement d of the book and the cosine of the angle  between the direction of the force and the direction of the displacement:

In our problem, the student is lifting the book, so he is applying a force directed upward, and the book is moving upward, so F and d are parallel and therefore the angle is zero, so 
Therefore, the work done is