You are walking from your math class to your science class. You are carrying books that weigh 20 N. You walk 45 m down the hall, climb 15 m up the stairs, and then
walk another 30 m to your science class. What is the total work performed on your
books?

1800J

Explanation:

Given parameters:

Weight of the book  = 20N

Total distance covered  = 45m + 15m + 30m  = 90m

Unknown:

Total work performed on the books  = ?

Solution:

To solve this problem we must understand that work done is the force applied to move a body through a certain distance.

So;

    Work done  = Force x distance

  Work done  = 20 x 90  = 1800J