A man places a chain (of$$ mass m and length $$l) on a table slowly. Initially, the lower end of the chain just touches the table. The man brings down the chain by length $$l/2$$. Work done by the man in this process is

Question

Infinity Learn · Accepted Answer

The work done by the man is negative of the magnitude of decrease in potential energy of the chainwork done in lifting chain $$=mgl2n2$$ m  is mass of chain, g acceleration due to gravity,  l is length of chain, n is fraction of chain that is hanging here, work done $$=mgl2$$ $$1n21$$ $$-1n22$$ $$=mgl2$$ $$-mgl8$$ $$=3mgl8$$  but with a negative sign , as work is done by man against gravity

A man places a chain (of mass m and length l) on a table slowly. Initially, the lower end of the chain just touches the table. The man brings down the chain by length l/2. Work done by the man in this process is

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