An open train car, with a mass of 2010 kg, coasts along a horizontal track at the speed 2.73 m/s. The car passes under a loading chute and, as it does so, gravel falls vertically into it for 2.99 s at the rate of 435 kg/s. What is the car\'s speed after the loading is completed? Ignore rolling friction (as unrealistic as that may be).