Which fundamental principle governs the recoil of a gun and the propulsion of a rocket in space?

💡 Explanation:

The recoil of a gun and rocket propulsion are classical examples of the Law of Conservation of Linear Momentum. The forward momentum of the ejected mass (bullet or exhaust gases) is equal in magnitude and opposite in direction to the backward momentum (recoil) of the system's main body, ensuring the total momentum of the closed system remains constant.