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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. :)

Find Railroad Car On eBay Below:

Vintage LIONEL Model Railroad BIG TRAIN PASSENGER CAR  517 Red Green Tin Toy
Vintage LIONEL Model Railroad BIG TRAIN PASSENGER CAR 517 Red Green Tin Toy
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Lionel 6 19047 BALTIMOREOHIO RAILROAD COMBINATION CAR OBILLUMINATED
Lionel 6 19047 BALTIMOREOHIO RAILROAD COMBINATION CAR OBILLUMINATED
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LIONEL TRAIN BEECHNUT CHEWING TOBACCO BILLBOARD RAILROAD BOX CAR 6 7703
LIONEL TRAIN BEECHNUT CHEWING TOBACCO BILLBOARD RAILROAD BOX CAR 6 7703
$12.00
VINTAGE Model Railroad Train FREIGHT CAR 12 Orange Box Car LIONEL
VINTAGE Model Railroad Train FREIGHT CAR 12 Orange Box Car LIONEL
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Vintage Marlines B  O Railroad Train Car 254000
Vintage Marlines B O Railroad Train Car 254000
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1999 Lionel Holiday Season 40 Railroad Box Car 6 26243
1999 Lionel Holiday Season 40 Railroad Box Car 6 26243
$14.99
LIONEL TRAIN NP NORTHERN PACIFIC 40 RAILROAD FREIGHT BOX CAR 6 9770
LIONEL TRAIN NP NORTHERN PACIFIC 40 RAILROAD FREIGHT BOX CAR 6 9770
$10.00
LIONEL  25185 GREAT WESTERN RAILROAD BAGGAGE CAR WITH AIR WHISTLE LINCOLN LOG
LIONEL 25185 GREAT WESTERN RAILROAD BAGGAGE CAR WITH AIR WHISTLE LINCOLN LOG
$35.00
20 90309 Union Railroad Car no 101622 3 Car Hot Metal Car Set MTH
20 90309 Union Railroad Car no 101622 3 Car Hot Metal Car Set MTH
$495.00
MTH Premier Conrail 70 ABS RPO Passenger Car Smooth 3 Rail O Scale Road  33
MTH Premier Conrail 70 ABS RPO Passenger Car Smooth 3 Rail O Scale Road 33
$99.99
LIONEL 35200 STRASBURG RAILROAD PASSENGER OBSERVATION CAR TRAIN O GAUGE PARADISE
LIONEL 35200 STRASBURG RAILROAD PASSENGER OBSERVATION CAR TRAIN O GAUGE PARADISE
$179.95
LIONEL  6 9758 ALASKA RAILROAD BOX CAR IN BOX
LIONEL 6 9758 ALASKA RAILROAD BOX CAR IN BOX
$24.99
LIONEL TRAIN CHESSIE CO CHESAPEAKE OHIO WAFFLE SIDE RAILROAD BOX CAR 6 15002
LIONEL TRAIN CHESSIE CO CHESAPEAKE OHIO WAFFLE SIDE RAILROAD BOX CAR 6 15002
$29.99
LIONEL 0 027 PENNSYLVANIA 9162 CABOOSE MODEL RAILROAD TRAIN CAR
LIONEL 0 027 PENNSYLVANIA 9162 CABOOSE MODEL RAILROAD TRAIN CAR
$18.99
LIONEL 0 027 GUAGE I LOVE PENNSYLVANIA MODEL RAILROAD TRAIN CAR 6 19906
LIONEL 0 027 GUAGE I LOVE PENNSYLVANIA MODEL RAILROAD TRAIN CAR 6 19906
$14.95
Antique IVES Litho Tin Train 1707 Gondola Railroad Car
Antique IVES Litho Tin Train 1707 Gondola Railroad Car
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THE LIONEL LINES PRE WAR No 811 MAROON FLAT CAR 0 SCALE TRAIN RAILROAD
THE LIONEL LINES PRE WAR No 811 MAROON FLAT CAR 0 SCALE TRAIN RAILROAD
$9.99
LIONEL 6 81199 PENNSYLVANIA RAILROAD TANK CAR MADE IN THE USA
LIONEL 6 81199 PENNSYLVANIA RAILROAD TANK CAR MADE IN THE USA
$62.49
LIONEL 7 11107 G GAUGE PRR TANK CAR Pennsylvania railroad set add on NEW
LIONEL 7 11107 G GAUGE PRR TANK CAR Pennsylvania railroad set add on NEW
$38.64
Marx 352 Rock Island Railroad Car Vintage Railroad Car
Marx 352 Rock Island Railroad Car Vintage Railroad Car
$5.39
MTH RAILKING PRR TRAIN CABOOSE 30 4226 1 car o gauge 30 4226C NEW
MTH RAILKING PRR TRAIN CABOOSE 30 4226 1 car o gauge 30 4226C NEW
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O Gauge Alaska Rail Road O Gauge Hopper Car 279 3065 New in Box
O Gauge Alaska Rail Road O Gauge Hopper Car 279 3065 New in Box
$34.99
LIONEL 6 9704 O gauge Norfolk  Western 40 RAILROAD FREIGHT BOX CAR
LIONEL 6 9704 O gauge Norfolk Western 40 RAILROAD FREIGHT BOX CAR
$12.99
LIONEL TRAIN LINES RAILROAD CATTLE STOCK CAR W 4 HORSES W BOX 6 26139
LIONEL TRAIN LINES RAILROAD CATTLE STOCK CAR W 4 HORSES W BOX 6 26139
$15.00
LIONEL TRAIN DRGW 6464 650 DENVER RIO GRANDE 40 RAILROAD BOX CAR 6 29290
LIONEL TRAIN DRGW 6464 650 DENVER RIO GRANDE 40 RAILROAD BOX CAR 6 29290
$12.50
LIONEL TRAIN PFE 6464 700 PACIFIC FRUIT EXPRESS 40 RAILROAD BOX CAR 6 39269
LIONEL TRAIN PFE 6464 700 PACIFIC FRUIT EXPRESS 40 RAILROAD BOX CAR 6 39269
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LIONEL TRAIN DM 6464 725 DETROIT MACKINAC 40 RAILROAD FREIGHT BOX CAR 6 39254
LIONEL TRAIN DM 6464 725 DETROIT MACKINAC 40 RAILROAD FREIGHT BOX CAR 6 39254
$11.45
LIONEL TRAIN 6464 US UNITED STATES AIR FORCE RAILROAD FREIGHT BOX CAR 6 39275
LIONEL TRAIN 6464 US UNITED STATES AIR FORCE RAILROAD FREIGHT BOX CAR 6 39275
$20.50
Lionel Trains Railroad Hand Car Centennial Anniversary 1900 2000
Lionel Trains Railroad Hand Car Centennial Anniversary 1900 2000
$19.99
LIONEL TRAIN ARR 6464 825 ALASKA RAILROAD SERIES X 40 FREIGHT BOX CAR 6 39205
LIONEL TRAIN ARR 6464 825 ALASKA RAILROAD SERIES X 40 FREIGHT BOX CAR 6 39205
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Plasticville O O27 1625 100 Original Railroad Work Car Exc Condition
Plasticville O O27 1625 100 Original Railroad Work Car Exc Condition
$75.00
LIONEL TRAIN LINES PWC 6801 RAILROAD FLAT CAR W SPEED BOAT LOAD W BOX 6 26048
LIONEL TRAIN LINES PWC 6801 RAILROAD FLAT CAR W SPEED BOAT LOAD W BOX 6 26048
$15.50
LIONEL TRAIN LINES PWC 6500 RAILROAD FLAT CAR W RED  WHITE AIRPLANE 6 29461
LIONEL TRAIN LINES PWC 6500 RAILROAD FLAT CAR W RED WHITE AIRPLANE 6 29461
$14.50
LIONEL TRAIN LINES PWC 6800 RAILROAD FLAT CAR W YELLOW  BLACK AIRPLANE 6 19487
LIONEL TRAIN LINES PWC 6800 RAILROAD FLAT CAR W YELLOW BLACK AIRPLANE 6 19487
$24.49
Lionel6468TUSCAN Automobile Car1955BO Baltimore Ohio w Box Railroad Train Rare1
Lionel6468TUSCAN Automobile Car1955BO Baltimore Ohio w Box Railroad Train Rare1
$399.00
LIONEL 40 TON CBQ BURLINGTON RAILROAD CATTLE STOCK CAR W BOX  COWS 6 17705
LIONEL 40 TON CBQ BURLINGTON RAILROAD CATTLE STOCK CAR W BOX COWS 6 17705
$21.50
MTH RAIL KING TRAIN AMTRAK 1505 RAILROAD REEFER CAR W BOX 30 7811
MTH RAIL KING TRAIN AMTRAK 1505 RAILROAD REEFER CAR W BOX 30 7811
$6.50
MTH TRAIN BO BALTIMORE OHIO 8000 GALLON RAILROAD TANK CAR W BOX 20 96155
MTH TRAIN BO BALTIMORE OHIO 8000 GALLON RAILROAD TANK CAR W BOX 20 96155
$14.94
ATLAS O SCALE 977 1 ERIE RAILROAD 526 FLAT CAR 8073 w PIPE LOAD 2 RAIL LNOB
ATLAS O SCALE 977 1 ERIE RAILROAD 526 FLAT CAR 8073 w PIPE LOAD 2 RAIL LNOB
$46.95
MTH TRAIN LIGHTED NYC NEW YORK CENTRAL RAILROAD SNOW PLOW CAR UNIT 20 98219
MTH TRAIN LIGHTED NYC NEW YORK CENTRAL RAILROAD SNOW PLOW CAR UNIT 20 98219
$17.50


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