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Homework Help: Thermal Energy

  1. Dec 8, 2005 #1
    I've got a question on thermal energy:

    Two railroad cars, each of mass 6500 kg and traveling 86 km/h, collide head-on and come to rest. How much thermal energy is produced in this collision?

    Converted 86 km/h to m/s = 2.389 m/s
    I assumed that KE converted all into thermal energy:
    KE = 1/2 mv^2, but it doesn't turn out right.

    Thank you beforehand for any help!
  2. jcsd
  3. Dec 8, 2005 #2


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    Check your conversion. Also, did you include the kinetic energy of both cars?
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