Given information
From the question we can get some values, those are-
The railroad car's mass, 
The initial speed of the load, 
The initial speed of the railroad car, 
The mass of the load, 
Step-by-step explanation
The railroad car and its load are treated as if they were a separate system. Internal forces are those that act between the automobile and the load. When the weight is dumped onto the automobile, there is no external force acting on the mechanism. After then, the system's momentum is preserved.
Momentum is a measure of mass in motion: how much mass is moving and how fast. It is commonly denoted by the letter p.
We know that, the initial momentum of the system = The final momentum.
There,
the initial momentum of the car indicates=
the load indicates 
.
The car, together with the load, moves at a speed of v after the weight is put on it.
The car's ultimate momentum and the load = 
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Physics: Principles with Applications
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