Question

Problem 21c

Answer 1

Given information

Friction is the force that resists motion when the surface of one object comes in contact with the surface of another.

Step-by-step explanation

Step 1.

 

As we know the work done by the gravitational force is given by

 

Where  is the mass of the book,   is the gravitational acceleration, and   is the height of the table.

If we ignore the air resistance, then the work is done only by gravitational force.