[–30 –50]
[41.6 71.2]
[38.634 24.478 30.132]
680.88kg*m/s
44m/s
39m/s
[–44.44 55.56 –22.22]
[–13.636 12.727 29.091]
v1f = [–35.455 29.091 –23.636], v2f = [4.545 –0.909 –33.636]