Whats wrong with my bike?

stevengeelan
stevengeelan Posts: 6
edited September 2009 in MTB beginners
I bought a GT Aggressor XC3 at the weekend. I've had it out a twice with no problems, but tonight when going down hill, if I stopped pedaling the chain would become slack and if I moved the pedals backwards the chain would move backwards? Whats the problem with this? Has the bike been set up incorrectly?

I apologize for the lack of a technical explanation thanks for your help.

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