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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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Having trouble understanding why the total work is 0

The work exerted on the block because the gravity is equal to kinetic energy loss because the friction (this using energy conservation principle). …
Gabriel Sandoval's user avatar