Final answer:
The warhead of a practice rocket typically contains high explosives, such as TNT.
Step-by-step explanation:
The warhead of a practice rocket typically contains high explosives. High explosives, such as TNT (trinitrotoluene), are commonly used in rockets due to their ability to generate a large amount of explosive energy when ignited. The explosives create a powerful explosion upon detonation, propelling the rocket forward or creating a burst of energy and light.