# Answer on Mechanics | Relativity Question for Bryan

Question #19085

A 30,000 kg railroad car initially traveling to the right at 15 m/s collides inelastically with a 20,000 kg railroad car initially traveling to the left at 5 m/s. The cars stick together. What is their final speed?

Expert's answer

p1=30000*15

p2=20000*5

p1-p2=450000-100000=350000

p1-p2=p0

p0=m*V=>V=p0/m=350000/50000=7m/s

p2=20000*5

p1-p2=450000-100000=350000

p1-p2=p0

p0=m*V=>V=p0/m=350000/50000=7m/s

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