ما هي الطاقة؟

المصادر https://www.eia.gov/energyexplained/what-is-energy/ https://en.wikipedia.org/wiki/Energy https://www.forbes.com/sites/startswithabang/2019/08/14/is-energy-conserved-when-photons-redshift-due-to-the-expanding-universe/?sh=6c82d9353efa

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