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A few years ago, a similar idea occurred to me but I never carried it out.
Steve I'm glad you did. The idea occurred to me while watching the movie,
Cannery Row. Nick Nolte plays "Doc" in the film. At one point the scene
shows Doc laying on his bed and repeatedly throwing a baseball straight up
above him and catching it as it falls back down toward him. Doc lives in
his lab (he's a pro baseball pitcher turned biologist) so the ceiling in
the room is apparently fairly high. The scene appears to be filmed in
telephoto so there is this sensation of the ball getting bigger and then
smaller while the whole scene stays in focus.
I have wondered whether one
could take diameter vs time data on the ball and determine "g" or other
things from this. (I doubt that air resistance would be extremely
significant for a baseball, given the heights that might be achieved during
the throw.)