Hi! So i have been having this discussion with a friend. we have an old shaft going down about 100meters and we want to tie a 100kg sand bag and use it to generate electricity as it falls. (we will simply pull it back up) if my understanding is right, then: i can either generate 980kw for 1 second OR aprox 200watts for 1 hour. am i correct? if i am correct, then how exactly do i make the weight fall over 1 hour? also, i know that the figure of 980kw does not take into account efficency loss so can i get plz get some advice on this as well? what will be the true output once friction and all that is taken into account?