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A railroad hopper car filled with sand is rolling with an initial speed of 17.5 m/s on straight, horizontal tracks. You can ignore frictional forces

A railroad hopper car filled with sand is rolling with an initial speed of 17.5 m/s on straight, horizontal tracks. You can ignore frictional forces on the railroad car. The total mass of the car plus sand is 85,000 kg. The hopper door is not fully closed so sand leaks out the bottom. After 22.0 minutes, 1.40×104 kg of sand has leaked out.


Then what is the speed of the railroad car?

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