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Because those people are only at user level 1, so limiting their ability to post reduces the amount of spam/chat/nonsense they can post before any violations are reported and removed.
Sharon
Learn about Points & Levels: /info/scoring_system
Daniel
Because that's the Limit for Level 1 users Yahoo has a Limit on the Number of Questions that can be Answered Each Day for Each Level to Prevent Spam and Misuse on this Site
Anonymous
Limiting newbies to 20 answers a day is meant to stop them and spammers from flooding the site with things the site isn't for
Benito Camelas
It depends on the level you are in. We who are at level 7 can answer 160 questions per day.