Question

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Why does the total amount of energy remain constant in the law of conservation of energy?

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Answer 1

The energy conservation law is a consequence of the shift symmetry of time; energy conservation is implied by the empirical fact that the laws of physics do not change with time itself.

Step-by-step explanation:

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Answer 2

Mechanical energy is the sum of the potential and kinetic energies in a system. The principle of the conservation of mechanical energy states that the total mechanical energy in a system remains constant as long as the only forces acting are conservative forces.

Step-by-step explanation: