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Mechanical energy is defined as the sum of kinetic energy + potential energy.
An automobile IS not energy; it merely USES energy.
The possessive form for the noun automobile is automobile's.
An energy transformation I've observed in class is chemical energy from a battery to electrical energy.
During combustion, energy is released. Some of this energy takes the form of light, making the flame visible.
chemical
Mechanical energy
Kinetic energy ----> Heat
The plural form for the noun automobile is automobiles.
fire energy
Automobile.
car.