A Railroad Water Tanker Car with a Total Mass of 1.50·10⁵

Multiple Choice

A railroad water tanker car with a total mass of 1.50·10⁵ kg rolls without friction or air resistance along a straight,level track at a constant speed of 5.74 m/s.As the car rolls it springs a leak at the bottom of the tank,releasing a stream of water going straight down.What is the speed of the car after the 6.35·10⁴ kg of water have leaked out of the car?

A) 4.75 m/s
B) 13.6 m/s
C) 9.95 m/s
D) 12.5 m/s
E) 5.74 m/s