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anonymous

  • 5 years ago

A single 1,300 kg cargo train car is rolling along a train track at 2.0 m/s when 400 kg of coal is dropped vertically into it. What is its velocity right afterward? Assume a closed system. 1.5 m/s 2.0 m/s 6.5 m/s 0.0011 m/s

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  1. JamesJ
    • 5 years ago
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    Use Conservation of Momentum. The momentum of the train before the coal added is equal to the momentum after the coal is added. See what to do now?

  2. anonymous
    • 5 years ago
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    not really :(

  3. anonymous
    • 5 years ago
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    The definition of momentum is\[\vec p = m \vec v\]So if momentum before the coal is dropped must equal the momentum before this event occurs. \[\vec p_i = \vec p_f\]Hopefully you can see what to do now!

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