Videos determine the Moon's g using Tracker and The Apollo 15 Hammer-Feather Drop video large version

was reading http://iopscience.iop.org/0031-9120/46/1/F01 by J R Persson and J E Hagen

website: http://nssdc.gsfc.nasa.gov/planetary/lunar/apollo_15_feather_drop.html
video: ftp://nssdcftp.gsfc.nasa.gov/miscellaneous/planetary/apollo/AS15_Ham_feath_drop3.mov

decided to try it out myself.
if the assumption of the man in space suit is 2.0 m, the value of g on moon is roughly 1.6 to 2.0 m/s^2 from my analysis.

this activity is indeed becoming scientist!
something i thought that could be shared as one of the feedback in YJC tracker scaling, the comment was "he or she or the group did not feel they are thinking like scientist".