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The law of conservation of energy, which states that the amount of energy in a system is constant. For questions about Earth's environment, see the climate-science tag instead.

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Intuitively, why is the quantity of kinetic energy conserved in a 1-dimensional elastic coll... [closed]

Two blocks of masses and velocities $(m_1, \textbf{v}_{1,\:i})$ and $(m_2, \textbf{0})$ composed of identical material move towards each other on a frictionless plane in vacuum. They collide. It is a …
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