The main transformation of energy in this example is from the chemical energy in Jay's body to kinetic energy in the car.
Chemical energy is the energy of chemical substances that is released when they undergo a chemical reaction and transform into other substances.
Chemical energy from Jay's body to mechanical energy to wind up the key. Upon wind up the key, mechanical energy converted into potential energy within the spring. Next, the spring tries to releases itself and the potential energy is converted into kinetic energy as the toy car moves forward.
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