Best approach to physics animation in Silverlight?

Question

I am new to Silverlight and want to revive a ball that is fired from a cannon and then moves through the air according to the laws of physics (so rude, along an elliptical path).

My tendency is to use a callback timer and move the small ball every 50 ms by changing its Canvas.LeftProperty and Canvas.TopProperty values. Is this the right approach or should I use DoubleAnimation? My resistance to using animations here is that I would have to create many different animations in a row.

Which way will the Silverlight guru take?

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Of course, it will include nontrivial math to determine the exact numbers to enter in AccelerationRatio , DecelerationRatio , SpeedRatio , Duration , From, and To . But you have to work, no matter what method you use.