Douglas_Knight comments on Open Thread: March 2010 - Less Wrong
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Having less information makes easier the problem of satisfying the teacher. It does not make easier the problem of determining when the ball hits the ground. Incidentally, I got the impression somehow that there are venues where physics teachers scold students for using too much information.
ETA (months later): I do think it's a good exercise, I just think this is not why.
Here, though, the problem actually is simpler the less information you have. As an extreme example, if you know nothing, the probability is always 1/2 (or whatever your prior is).