hello everyone. me and my mates as some fun over the school holidays are having a competition to see who can throw 1Kg the highest without the use of electronics due to an unfair advantage to those more well off etc. my first idea was a rail gun but as that requires electronics it is unable to be used. other conditions on the competition is that the device/machine has to be no taller than 2m and no wider then 1mX1m. i was thinking some sort of pully system where i can put in a lot of force on the one end and achieve massive acceleration on the other. just wanted to get any tips on my idea or any other better ideas before i get making. thanks.