ok ,we have some clever dudes on this site,now i,m going to give you a puzzle that,s not listed,(as far as i know)this is in 2 parts ,,if you was standing on top of a train carriage and the train is traveling at 50 miles an hour,if you jump up would you land in the same spot? now take it a little further, you are standing inside a train carriage that is going 50 miles an hour,if you jump up in the air will you land in the same spot, or will the train have moved forward , he he,mike