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Energy is the conserved quantity associated to time-translation invariance and represents the work a system is capable of doing. Use this tag for questions about energy, and consider adding the [energy-conservation] tag if it is specifically about its conservation.
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What is the physical significance of momentum and energy in kinematics?
Thank you all for the insightful comments on my previous question Are the concepts of motion such as mass, momentum, impulse, work, energy, force etc. fictitious/abstract concepts or are they real "things … Same question applies to energy, etc. …