An open box-car has a mass of 30,000 kg and is moving on a level railroad track at 4.00 m/s. 1,000 kg of water falls straight down into the box-car. The velocity of the box-car after the water falls into the box- car is
A. 7.01 m/s.
B. 6.55 m/s.
C. 5.02 m/s.
D. 3.87 m/s.
E. 2.89 m/s.
D. 3.87 m/s.
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