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Railroad Car

what is the speed of the railroad car?

A railroad hopper car filled with sand is rolling with an initial speed of 11.0 m/s on straight, horizontal tracks. You can ignore frictional forces on the railroad car. The total mass of the car plus sand is 82,000 kg. The hopper door is not fully closed so sand leaks out the bottom. After 44 min, 14,000 kg of sand has leaked out. Then what is the speed of the railroad car?

I'm probably wayyyy wrong but, assuming you are counting air resistance as part of the "frictional forces", wouldn't that then make the sand irrelevant and therefore without being acted on by another force, wouldn't the speed remain 11.0 m/s (39.6Km/h)? Just my guess. :)

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Lionel 614 Alaska Railroad Diesel Car
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Lionel Trains 1989 Railroad Club Tool Car 6 16802
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MTH The New York NEW HAVEN and Hartford Railroad Co Tank Car ref 20 90027C NEW
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Lionel Special Edition Railroad Club Searchlight Car 16803 NEW MINT IN BOX
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Lionel 6 16803 Railroad Club Searchlight car in original Box
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O Freight Car Data Railroad Roman White Decals 2 Sheets Microscale 48 660 y
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LIONEL 25185 GREAT WESTERN RAILROAD BAGGAGE CAR WITH AIR WHISTLE LINCOLN LOG
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Lionel Trains Railroad Hand Car Centennial Anniversary 1900 2000
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Lionel O gauge 6565 old number Box car 29295 NIB Road Pennsylvania Rail road
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