A train car is moving at constant velocity when rain stars entering into it. C. The car slows down because there more mass and the overall momentum remains constant.
A train car with an open top is traveling at a constant velocity, when it starts raining, causing the car to take on water. We need to consider the momentum of the system.
The momentum (p) is the quantity of motion of a moving body, measured as a product of its mass (m) and velocity (v).
p = m × v
It is a law according to which the momentum that characterizes motion never changes in an isolated collection of objects; that is, the total momentum of a system remains constant.
When the train car is filled with water, the total mass increases. To conserve the momentum constant, the velocity decreases.
Which statement best describes the change in motion the car experiences?
A train car is moving at constant velocity when rain stars entering into it. C. The car slows down because there more mass and the overall momentum remains constant.
The question was incomplete. The complete question is:
A train car with an open top is traveling with a constant velocity. It starts raining causing the car to take on water. Which statement best describes the change in motion the car experiences?
A. There is no change. The extra water causes no change in the car's motion.
B. The car speeds up due to the extra mass of the water increasing the total momentum.
C. The car slows down because there more mass and the overall momentum remains constant.
D. The car slows down because the overall momentum decreases due to the extra mass.
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