We have posted an article on our site about how you can make a 2D platformer and use a physics engine for collision detection. http://www.defold.com/doc/platformer
The article is for beginners, but others might find something of value as well. We wrote it in the context of our gamedev platform Defold, but the code and methods should be easily ported to other platforms or languages (we use Lua). Hope you find it useful, let me know if anything is confusing or plain wrong and I will correct it. Thanks!
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