Question

A book of mass 1kg is on the floor. If the book is lifted from the floor to the top shelf which is 2 meters from the floor, how much work is done on the book?

Answer 1

Answer:

19.6 J

Explanation:

Here, the work done will be against the gravity. The force acting is only the gravitational force and the book is lifted against it.

We know that

Work done on lifting a body of mass m to the height h = mgh, where g is acceleration due to gravity

Therefore, the work done on the book = 1 × 9.8 × 2 kg × m/s²

                                                                 = 19.6 Joule