How do physics work for ball and paddle style games like Breakout and Pong?

I have the following game:

I have the rectangle collisions ready with the ball and with the tiles. but my problem is when the ball hits the tiles and the bat, what angle should开发者_开发技巧 the ball bounce at? How do I determine that?

You should read up on physics, specifically Reflection. There are lots of tutorials on Breakout style physics.

It's not that difficult, if the ball hits a vertical obstacle simply invert its x velocity, if it hits a horizontal obstacle invert its y velocity.

There is actually a built in method in the XNA Vector2 class just for this. Check out the Vector2.Reflect method.