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Railroad Car

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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. :)

Find Railroad Car On eBay Below:

LIONEL 6 28440 PENNSYLVANIA RAILROAD MOTORIZED INSPECTION CAR LN IN BOX
LIONEL 6 28440 PENNSYLVANIA RAILROAD MOTORIZED INSPECTION CAR LN IN BOX
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MTH RAIL KING UNION PACIFIC RAILROAD bay window CABOOSE O GAUGE + generator car
MTH RAIL KING UNION PACIFIC RAILROAD bay window CABOOSE O GAUGE + generator car
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Vintage MARX 553 SANTA FE MIDDLE STATES OIL TANK TRAIN CAR Tin Railroad Parts
Vintage MARX 553 SANTA FE MIDDLE STATES OIL TANK TRAIN CAR Tin Railroad Parts
$4.50
Vintage O27 Train Lionel Lines Bucyrus Erie Class 250 Railroad Crane Car 2460
Vintage O27 Train Lionel Lines Bucyrus Erie Class 250 Railroad Crane Car 2460
$47.50
Lot Of 5 Vintage Lionel Train Railroad Cars 1007 6017 6472 6462 6465
Lot Of 5 Vintage Lionel Train Railroad Cars 1007 6017 6472 6462 6465
$32.95
MTH CNJ RAILROAD PASSENGER CARS 346 AND ASBURY PARK DOME OBSERVATION VERY NICE
MTH CNJ RAILROAD PASSENGER CARS 346 AND ASBURY PARK DOME OBSERVATION VERY NICE
$70.00
Kalamazoo Trains Pennsylvania Railroad 1877 9 Undecorated Flat Car w Stakes
Kalamazoo Trains Pennsylvania Railroad 1877 9 Undecorated Flat Car w Stakes
$29.99
Sunset 3rd Rail Long Island Railroad P54 Passenger Car Number 164
Sunset 3rd Rail Long Island Railroad P54 Passenger Car Number 164
$150.00
LIONEL TRAIN ART 26269 WABASH AMERICAN TRANSIT RAILROAD REEFER CAR W BOX 6 17304
LIONEL TRAIN ART 26269 WABASH AMERICAN TRANSIT RAILROAD REEFER CAR W BOX 6 17304
$12.00
New K Line Ringling Bros Barnum  Bailey Crane Car K6810 O Gauge Railroad Rare
New K Line Ringling Bros Barnum Bailey Crane Car K6810 O Gauge Railroad Rare
$34.99
Sunset 3rd Rail Long Island Railroad P54Combine Car Number 614
Sunset 3rd Rail Long Island Railroad P54Combine Car Number 614
$150.00
New K Line Ringling Bros Barnum  Bailey Box Car Clown K487 OGauge Railroad Rare
New K Line Ringling Bros Barnum Bailey Box Car Clown K487 OGauge Railroad Rare
$19.99
Sunset 3rd Rail Long Island Railroad P54 Passenger Car Number 157
Sunset 3rd Rail Long Island Railroad P54 Passenger Car Number 157
$150.00
Vintage Lionel 3859 Automatic Dump Car w Original Box Prewar Railroad Train O
Vintage Lionel 3859 Automatic Dump Car w Original Box Prewar Railroad Train O
$29.99
1999 Lionel Holiday Season 40 Railroad Box Car 6 26243
1999 Lionel Holiday Season 40 Railroad Box Car 6 26243
$14.99
Vintage Lionel Lines No 813 Live Stock Cattle Car Prewar Railroad Train O Gauge
Vintage Lionel Lines No 813 Live Stock Cattle Car Prewar Railroad Train O Gauge
$15.49
Vintage Lionel Lines No 813 Live Stock Cattle Car Prewar Railroad Train O Gauge
Vintage Lionel Lines No 813 Live Stock Cattle Car Prewar Railroad Train O Gauge
$15.99
LIONEL CANADA DRY GINGER ALE SODA POP BILLBOARD RAILROAD BOX CAR 6 7802 MIB
LIONEL CANADA DRY GINGER ALE SODA POP BILLBOARD RAILROAD BOX CAR 6 7802 MIB
$13.59
LIONEL TRAIN BO BALTIMORE OHIO 50 DOUBLE DOOR RAILROAD BOX CAR 6 17209 MIB
LIONEL TRAIN BO BALTIMORE OHIO 50 DOUBLE DOOR RAILROAD BOX CAR 6 17209 MIB
$12.50
Lionel O Gauge 6 17406 Pennsylvania Railroad PRR Gondola Train Car W Covers NIB
Lionel O Gauge 6 17406 Pennsylvania Railroad PRR Gondola Train Car W Covers NIB
$7.50
Vintage Lionel Lines No 3811 Log Dump Lumber Car Prewar Railroad Train O Gauge
Vintage Lionel Lines No 3811 Log Dump Lumber Car Prewar Railroad Train O Gauge
$13.37
Vintage Lionel Lines No 811 Maroon Box Lumber Car Prewar Railroad Train O Gauge
Vintage Lionel Lines No 811 Maroon Box Lumber Car Prewar Railroad Train O Gauge
$19.99
Vintage Lionel Lines No 815 Pea Green Tank Car Prewar Railroad Train O Gauge
Vintage Lionel Lines No 815 Pea Green Tank Car Prewar Railroad Train O Gauge
$19.99
Lionel Train Republic Steel Yellow Railroad Gondola Car W 3 Canisters 6 9055
Lionel Train Republic Steel Yellow Railroad Gondola Car W 3 Canisters 6 9055
$20.00
Vintage Lionel Lines No 2815 Sunoco Gas Oil Tank Car Prewar Railroad Train O
Vintage Lionel Lines No 2815 Sunoco Gas Oil Tank Car Prewar Railroad Train O
$17.00
Lionel 6 9551 Western  Atlantic Railroad Baggage Car w Box for the GENERAL
Lionel 6 9551 Western Atlantic Railroad Baggage Car w Box for the GENERAL
$29.00
Plasticville O O27 45983 Railroad Work Car Only Excellent Condition
Plasticville O O27 45983 Railroad Work Car Only Excellent Condition
$18.50
Lionel O Gauge Pennsylvania Railroad Box Car
Lionel O Gauge Pennsylvania Railroad Box Car
$18.00
Lionel 6 19100 Amtrak Baggage Passenger Car O Gauge Model Trains Railroads
Lionel 6 19100 Amtrak Baggage Passenger Car O Gauge Model Trains Railroads
$89.95
MTH RailKing 30 74824 Happy Holidays Box Car O Gauge Model Railroads Trains
MTH RailKing 30 74824 Happy Holidays Box Car O Gauge Model Railroads Trains
$49.95
MTH Premier 20 96269 Nourse Motor Oil Tank Car O Scale Model Railroads Trains
MTH Premier 20 96269 Nourse Motor Oil Tank Car O Scale Model Railroads Trains
$64.95
MTH RailKing 30 74823 Christmas 2015 Box Car O Gauge Model Railroads Trains
MTH RailKing 30 74823 Christmas 2015 Box Car O Gauge Model Railroads Trains
$49.95
Vintage HO Gauge LN Log Flat Car 24562 Collectible Railroad Model Train Antique
Vintage HO Gauge LN Log Flat Car 24562 Collectible Railroad Model Train Antique
$17.39
American Flyer Prewar O 311267 Red Pennsylvania Railroad PRR Hopper Car 4 Wheel
American Flyer Prewar O 311267 Red Pennsylvania Railroad PRR Hopper Car 4 Wheel
$4.99
LIONEL 19924 19930 19935 19940 RAILROAD CLUB ASSORT CARS  29232 LENNY THE LION
LIONEL 19924 19930 19935 19940 RAILROAD CLUB ASSORT CARS 29232 LENNY THE LION
$99.95
Early Vintage HO Marklin Talbot Hopper Car Train 367 All Metal Germany Railroad
Early Vintage HO Marklin Talbot Hopper Car Train 367 All Metal Germany Railroad
$14.95
O  027 LIONEL SCRAP YARD I LOVE PENNSYLVANIA BOX CAR MODEL RAILROAD TRAIN
O 027 LIONEL SCRAP YARD I LOVE PENNSYLVANIA BOX CAR MODEL RAILROAD TRAIN
$4.99
Bing Pennsylvania Railroad 4 Axle Box Car O Gauge VG 1912 to 1926
Bing Pennsylvania Railroad 4 Axle Box Car O Gauge VG 1912 to 1926
$250.00
Lionel Train Cracker Jack Candy Billboard Railroad Reefer Car 6 9853
Lionel Train Cracker Jack Candy Billboard Railroad Reefer Car 6 9853
$8.50
Lionel O Gauge Pennsylvania Railroad Single Dome Tank Car
Lionel O Gauge Pennsylvania Railroad Single Dome Tank Car
$25.00


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