Install libbox2d-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libbox2d-doc
Description:
2D physics engine - documentation
2D rigid body simulation library for games. Programmers can use it in their games to make objects move in believable ways and make the world seem more interactive. . This package contains the API documentation and the manual.
Homepage: http://www.box2d.org/
Version: 2.3.1+ds-4
Section: universe/doc