So chemgeek thinks that a person accelerates up at about 1g while jumping. I think it's more like 3g.

If he's right and it's 1g, then the extra 5/6 g of being on the moon (and not having to fight earth's gravity while pushing off from the ground) would greatly increase your jumping speed. But if I'm right and it's 3 or 4g, then the extra 5/6 g from being on the moon probably won't add that much.

Now I want to try and think of a simple way to find out how fast we accelerate while we push off from the ground. It could be calculated from the ratios of how much we crouch to how high we go in the air, for example. But without Mythbusters-style high-speed footage of someone jumping in front of a wall painted in horizontal black-and-white bands, it's hard to come up with a number that's any better than one we just make up.

See how much good (ish) science this Happy Meal bag has stimulated? ;]