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I avoid noise in the free fall data by having the students use 16
positions evenly spaced in time. The key point is that *no* position
gets used more than once. I ask them to calculate the average velocity
between the 1st and 9th point, the 2nd and 10th point, etc. to the 8 and
16th points. This means they only get 8 velocities, BUT THEY ARE
INDEPENDENT, AND ARE OVER LONG DISTANCES-SO SMALL POSITION ERRORS ARE'T
FATAL.