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Homework Help: Two train cars being coupled on tracks

  1. Apr 22, 2012 #1
    3. Two train cars are to be coupled on the tracks. One of the cars, say A is initially at rest. The other car, say B is travelling at a speed v toward A: Car B is empty, whilst car A is full of pig iron and has a mass of 102mB: After coupling, the two cars travel a distance of 20 meters before coming to rest. The coefficient of static friction of iron-on-iron is 1.1. Assume the tracks are level.
    (a) What was the initial speed v of car B?
    (b) How much energy was given up to the coupling process?
  2. jcsd
  3. Apr 22, 2012 #2
    Again, please show us your attempt at a solution. We are not allowed to help unless you have shown that you have already tried the problem.
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