pysc

a locomotive of mass 15000kg traveling at 2.5m/s collides and couples with a set of rail carts of mass 7000kg.calculate:
1.the combined velocity of the train and carts after impact
2.the loss in kinetic energy in the collision

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    Ms. Sue
  2. Now this time you told me the collision is inelastic, they stick together.
    Therefore we have one mass of 22,000 kg after collision.
    I assume the carts were stationary before the crash.
    Initial momentum=
    15,000*2.5 + 0 = 37,500 kg m/s
    = final momentum = 22,000 v
    so
    v = 1.68 m/s

    initial Ke = (1/2) (15,000)(2.5)^2
    final Ke = (1/2)(22,000)(1.68)^2

    subtract the final from the initial to find the loss in the heat of collision

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