The Maths as promised:
Time of fall (Box is actually 23inches above snow level):
2ft = 1/2(32)t^2
2/16 = t^2
t = .35s
Distance traveled:
253 strides x 2.5ft/stride = 633ft
Speed:
v = d/t
v = 633/.35
v = about 1800fps
this seems really fast so as a check I looked at the video to find how fast the gun recoiled (good thing I didn't put a rock behind it) I know the mass of the 2 objects and I know that the momentum should be the same assuming no losses. the gun weighs 3.7kg and the ball weighs .0
