Look for the book on platforms like Labirint or Ozon where teachers often share digital keys in the reviews or forums.
Many editions of the book (like the 1983 or 1987 versions) actually include solutions and detailed hints at the back, which acts as the official GDZ. gdz po fizike 10-11 klass bakanina belonuchkin kozel
The problems aren't just about plugging numbers into a formula. They require "physical thinking"—the ability to estimate values and understand complex, real-world phenomena. Look for the book on platforms like Labirint