9. Am - 500 kg sack of coal falls vertically onto a M = 2000 kg railroad flatcar which was initially moving horizontally at 3 m/s. No external forces, including friction, acton the flatcar. After the sack rests on the flatcar, the speedof the flatcar is: a) 1.8 m/s b) 2.4 m/s c) 3.6 m/s d) 0.6 m/s e) 1.2 m/s

9. Am - 500 kg sack of coal falls vertically onto a M = 2000 kg railroad flatcar which was initially moving horizontally at 3 m/s. No external forces, including friction, acton the flatcar. After the sack rests on the flatcar, the speedof the flatcar is: a) 1.8 m/s b) 2.4 m/s c) 3.6 m/s d) 0.6 m/s e) 1.2 m/s