Final answer:
The density of the book is 40g/cm³.
Step-by-step explanation:
The density of an object is calculated by dividing its mass by its volume. In this case, the book has a mass of 2000g and a volume of 50cm³.
To find the density, we use the formula:
Density = Mass / Volume
So, the density of the book is:
Density = 2000g / 50cm³ = 40g/cm³