Final answer:
The SI unit of heat energy, work, and energy is the joule (J), often expressed in kilojoules (kJ) for larger amounts. This unit is interchangeable in various energy-related calculations.
Explanation:
The SI unit of heat energy is the joule (J), which is also the SI unit for work and energy. For example, a kilojoule (kJ) is commonly used for larger amounts of energy. In a practical example, the kinetic energy of a moving car traveling at a certain speed can be expressed in joules or kilojoules.
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