Given: Each railroad car has a mass of 78000 kg Five coupled railroad car moving

Question

Given: Each railroad car has a mass of 78000 kg

Five coupled railroad car moving with a speed of 3.9 m/s collide and couples with six other coupled railroad cars moving in the same direction with an initial speed of 1.2 m/s.

a) What is the speed of all eleven cars after the collision? Answer in units of m/s

b) How much energy is lost in the collision?

Please provide a good explanation. I have an exam on Thursday and I'm pretty sure there will be a problem similar to this so I need to know how to redo this problem on my own.

Explanation / Answer

M1V1 = M2V2 M1 = mass before collision = 78,000 x 5 =390,000 V1 = 3.9 m/s M2 = mass after = 11 x 78,000 = 55,000,000 V2 = M1V1/M2 = [(390,000)(3.9)]/(55,000,000) = .027 m/s + initial = .027 m/s + 1.2 = 1.227 m/s B) Energy loss = change in speed lost

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