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    Momentum of Freight car containing a mass of sand

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    A freight car of mass M contains a mass of sand "m". At t=0 a constant horizontal force F is applied in the direction of rolling and at the same time a port in the bottom is opened to let the sand flow out at constant rate dm/dt.

    Find the speed of the freight car when all the sand is gone. Assume the freight car is at rest at t=0

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    Solution Preview

    We can start w/ Newton's law F=ma

    But in this case "m" is the mass of the car and the sand

    We should write this as...

    The mass of the sand lost is ...

    Solution Summary

    The solution includes all the formulas with explanations in solving the problem.