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posted by Anonymous Monday, November 19, 2012 at 4:07pm.
A 40,000 kg railroad car initially traveling at 10 m/s collides inelastically with a 20,000 kg railroad car intially at rest. The cars stick together. What is their final speed?
m1•v1 =(m1+m2)v v= m1•v1/m1+m2)
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