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To understand how to apply the law of conservation of energy to situations with and without nonconservative forces acting. The law of conservation of energy states the following: In an isolated system the total energy remains constant. If the objects within the system interact through gravitational and elastic forces only, then the total mechanical energy is conserved. The mechanical energy of a system is defined as the sum of kinetic energy KKK and potential energy UUU. For such systems where no forces other than the gravitational and elastic forces do work, the law of conservation of energy can be written as
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