Oh, you actually calculated it? And still, a metal helmet on a minetrack hitting you would be pretty painful. And I calculated it being in the nether. Since distances are 8x shorter in the nether, it would be moving at 160 MPH there. And this is getting seriously off-topic. This guy wanted a way to turn EU into EMC by using it to power a quarry or something, how'd it get into talking about physics? Also, if minecraft was more realistic, if you had iron armor, water would rust it. Liquids would leak through open doors. You'd die because of thin air if you went too high up. Also,zombies would just kill you in one hit because they'd infect you.