Answer: vf= 51 m/s and d= 112 m
Explanation: solution attached
Answer:
500000000
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Thermal energy, radiant energy
Answer:
The momentum would be doubled
Explanation:
The magnitude of the momentum of the freight train is given by:

where
m is the mass of the train
v is its speed
In this problem, we have that the speed of the train is unchanged, while the mass of the train is doubled:

therefore, the new momentum is

so, the momentum has also doubled.