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Those of us that have analyzed real experimental data may have a different
perspective as to what looks linear. Video analysis is an experimental tool,
not a computer game. As such, the data is real. Video files are just large
(visual) data base recordings of position versus time. They are not created
animations produced to fit physical laws. ... When using video analysis as
an experimental tool, experimental design is just as important as with any
other experimental method. Done correctly, this approach gives comparable
results to other timing methods including spark timers, smart pulleys, and
sonic rangers.