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Just a note that PASCO scientific sells such a linear encoder. It is called
a rotary motion sensor ...
... and can be used with air tracks as you suggested.
It also has many more uses and is one of the most important sensors you
can purchase.
One version of what John refers to is a 'shaft encoder'. We use these for
pendulum experiments, and many other applications.
They can be mounted as pulleys at the end of the track. A light cord over the
pulley gives the displacement of the cart vs. time. The resolution of the
encoders is outstanding - much better than sonic rangers.