No, not kinetic energy.
Burning fossil fuels turns potential energy into kinetic energy. Kinetic energy is energy in motion, which can be used to do work.
I would actually describe the energy as chemical, as the energy is being used to hold the chemical bonds of the hydrocarbons together. But it is certainly not kinetic, so give these two choices the answer is potential. It is potential energy waiting for a chemical reaction.
Fossil fuels contain energy that originally came from the sun, which was absorbed by plants through photosynthesis millions of years ago. This energy is stored in the form of carbon compounds in fossil fuels such as coal, oil, and natural gas. When these fuels are burned, they release this stored energy in the form of heat and light.
Chemical energy from organic matter is stored in fossil fuels. When burned, this energy is released in the form of heat, which is converted into kinetic energy to produce electricity or power engines, for example.
No. Fossil fuels store chemical energy. It is this chemical energy we tap by using them for fuels.
Potential
Fossil fuels like coal store potential energy in the form of chemical bonds. When they are burned, this potential energy is converted into heat energy (thermal energy) and released as a result of chemical reactions taking place. Kinetic energy is the energy of motion, and while there may be kinetic energy involved in the burning process (e.g., moving particles in the flame), the primary form of energy stored in fossil fuels is potential energy.
Fossil fuels contain chemical energy.
Fossil fuels contain energy that originally came from the sun. Plants and other organisms that lived millions of years ago absorbed sunlight through photosynthesis and stored this energy in their tissues. Over time, this organic matter was buried and compressed, eventually forming fossil fuels like coal, oil, and natural gas.
The heat is produced by the formation of chemical bonds between carbon and oxygen, and between hydrogen and oxygen. So CO2 and water are the necessary products when fossil fuel is burned, without which there would be no heat.
Chemical energy
When fossil fuels are burned, the chemical energy stored in the fuel is converted into heat energy. This heat energy is then used to produce steam in power plants, which drives turbines to generate kinetic energy that is ultimately converted into electricity.