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If one math book weighs 1 kilogram, then 10 math books will weigh 10 kilograms in total. Each math book contributes 1 kilogram to the total weight, so multiplying by 10 gives the weight of 10 math books as 10 kilograms.
It depends on the size, material, and contents of the book bag. Many book bags weigh more than 1 pound, especially if they are made of sturdy materials and are filled with books or other items.
The work done on the books would be 20 N * (45 m + 15 m + 30 m) = 20 N * 90 m = 1800 J.
A typical math textbook may weigh around 2-4 pounds, depending on its size and thickness. A textbook with more pages and a hard cover will typically weigh more than a thinner, paperback version.
You would typically use centimeters (cm) or millimeters (mm) to measure the width of a book. These units provide a more precise measurement for smaller objects like books.