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I seem to understand the difference between the instantaneous speed and the average speed, but I still have some doubts. For example, the speed of the train after speed increase is 150km / h. I think I can also see that the speed of the train at a certain point of displacement is 150km / h. how to explain this and how to deal with this type of problem
It has nothing to do with physics. From the perspective of context, people will not speak so strictly in life
The average speed of the train reaches xxo km / h after the speed increase. It means that the average speed of the train is xxo km / h when the road condition is normal, excluding the acceleration and deceleration process such as entering the station and temporary parking
When taking EMU, you can see the real-time speed of the train, such as Xoo km / h, which can be approximated to the instantaneous speed
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