Answer: chemical energy- thermal energy- mechanical energy
Step-by-step explanation:
Fossil fuels are the organic fuels produce by the activity of microbes living in the soil. These fossil fuels consist of elements which are the source of chemical energy. When these chemicals are burned they produce intense heat energy along with gases which exerts pressure over the machinery in the vehicle, which facilitates it's movement.
Therefore, chemical energy is converted into thermal energy and finally to mechanical energy.