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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
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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

User Mpcabd
by
6.7k points

1 Answer

2 votes
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
User Virtuexru
by
7.4k points
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