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

Question

Quizplus · Accepted Answer

The speed of the car remains constant at 5.74 m/s because the system conserves momentum. The leaking water does not exert a horizontal force on the car, so its speed does not change.

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

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