Respuesta :
Answer:
The speed decreases.
Explanation:
This can be explained using the conservation of linear momentum.
Since there is no friction, the initial moment of the train must be equal to its linear moment after it is filled with water.
the initial linear momentum is
[tex]m_{1}v_{1}[/tex]
where [tex]m_{1}[/tex] is the initial mass of the train, and [tex]v_{1}[/tex] the initial speed of the train.
And linear momentum after the water filled the train car is
[tex]m_{2}v_{2}[/tex]
where [tex]m_{2}[/tex] is mass of the train after the rain, and [tex]v_{2}[/tex] the speed of the train after the rain
the equality must be fulfilled:
[tex]m_{1}v_{1}=m_{2}v_{2}[/tex]
We know that if water is added to the train, [tex]m_{2}[/tex] that is the mass after the water is added, is greater than [tex]m_{1}[/tex] which is the mass of the train without the water.
Therefore, in order for the conservation of the linear momentum to be fulfilled: [tex]m_{1}v_{1}=m_{2}v_{2}[/tex]
the speed after the water is added ([tex]v_{2}[/tex] ) must be smaller than the initial train speed ([tex]v_{1}[/tex] ) . So the speed of the car decreases.
