Can anyone help with a question please....

Hi there,
This is my first post on the forums (hello all!) and I have a theoretical question that's been bugging me - I'm really hoping somebody here might be able to answer it....

If a one metric tonne weight was raised to a height of 5m and then allowed to descend in a controlled manor whilst connected to a system of cogs & gears which in turn are connected to a turbine/generator - by the time it's descended how much electricity could be generated?
I'm thinking it could be around 0.01 Kwh but could really do with somebody else's input.

Much appreciated,
Simon

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