Skier, on Jun 22 2007, 03:59 PM, said:
Without getting into a big Physics debate, the above is incorrect. To paraphrase Newton's 1st law, A object in motion tends to stay in motion. So an object with a horizontal velocity dropped from a chair or plane would tend to continue in the horizontal direction. (Air resistance would slow you down but should be negligible in the chair example) Once off the chair the only external force would be gravity which will effect the vertical speed only.
In principle, the idea that move horizontal speed could reduce the impact of a fall on a sloped surface appears correct. However, I don’t suspect that the difference in speed between a high speed lift and normal speed lift would be significant in most scenarios.