Surely you need to take into account the ratio of the lever length either side of the pivot point . Your analysis assumes a 11 ratio . If you made the distance from the 90 kg projectile to the pivot point twice the distance from the pivot point to the counterweight , you could half the counterweight . Actually , dont you need to take the total length of the lever into account ? If it was a long lever , it would move faster than a short lever , thus throwing the 90 kg projectile further , dare i say further than 300 meters ? That said im 4 shots into a bottle of vodka so i could be talking codswallop . <| sep |> Agreed , I ' m glad electronic voting is getting attention . I too thought the election was rigged towards Clinton even after she lost , now I ' m not so sure .