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The ask Dantes anything thread part II

Athens

Greatest Bloke Ever [Citation Needed]
Member
Dantes, say I have a 10 kg weight hanging on a 10 metre chain. I pull it back as far as I can and let it swing freely. Is the energy produced by it swinging less than the energy it took to pull it back as far as I could?

Please explain this in a language that I can understand.
 
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