A 6,600 kg train car moving at +2.0 m/s bumps into and locks together with one of mass 5,400 kg moving at -3.0 m/s.
What is their final velocity?
A.)-1.0 m/s
B.)+2.5 m/s
C.)-0.25 m/s
D.)+0.50 m/s
option B would be right one according to momentum conservation 6600*2 = 13200kgm/s 5400*3 = 16200kgm/s 16200-13200 = 3000 now 6600-5400 = 1200 kg thus 3000/1200 = 2.5 v
