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Here are free fall data I took from the DSON017 movie which came on the
same CD-ROM as VideoPoint. Called "Vertical Ball Toss" it was recorded
at 30 fps. There are 29 frames but only the 2nd half, the ball on the
way down is analysed here. "Insignificant" digits were used to avoid
additional rounding errors (in that sense digits are very significant).
time(s) dist(m) speed(m/s) g(m/s^2)
0.36666 0.000 AVERAGES
0.40000 0.015 0.450
0.43333 0.047 0.960 15.30 As you can see, the
0.46666 0.088 1.230 8.10 11.1 values of g fluctuate
0.50000 0.140 1.560 9.00 between 5.4 and 18.7
0.53333 0.198 1.740 5.40
0.56666 0.271 2.190 13.50 10.8 The mean acceleration is
0.60000 0.359 2.640 13.50 10.66 (or 10.08 if 15.3
0.63333 0.453 2.820 5.40 and 18.72 are ignored).
0.66666 0.557 3.120 9.00 9.6
0.70000 0.677 3.600 14.40 The mean is very good
0.73333 0.897 3.900 9.00 but the constancy of g
0.76666 0.948 4.224 9.72 9.3 is not demonstrated. I
0.80000 1.099 4.530 9.18 the most simple way of
0.83333 1.265 5.001 14.13 calculating v and g.
0.86666 1.437 5.157 4.68 12.5
0.90000 1.630 5.781 18.72 Even averages of 3 values
fluctuate by more than 5%
...