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A 17000 kg railroad car travels along on a level frictionless track with a constant speed of 23.0 m/s. A 5100 kg additional load is dropped onto the car. What then will be its speed in meters/second?

  • Physics -

    u= m₁v/(m₁+m₂)=
    =17000•23/(17000+5100)=17.7 m/s

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