Can someone explain the concept of relative velocity in physics?

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SUMMARY

The concept of relative velocity is crucial in understanding how two objects move in relation to each other. In the discussed example, two trains traveling in opposite directions at 80 km/h each have a relative velocity of 160 km/h. This is because, from the perspective of one train, the other train approaches at a speed that is the sum of their individual speeds. This principle applies universally to any two objects moving towards or away from each other.

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Bashyboy
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At the present moment, I am reading a section in my physics textbook concerning relative velocity. In an example the author provides, he states that two trains are traveling in opposite directions at a speed of 80 km/h; and relative two each other they are traveling at a speed of 160 km/h. Somehow, I cannot see why this is true, perhaps I have an underdeveloped physical intuition. Could someone help me with this concept?

Thank you
 
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Imagine yourself driving one train. As you look out the front window, you watch the other train approach. Doesn't it come towards you twice as fast as an object sitting on the ground next to the track would?

(Substitute "car" for "train" if that brings the situation more within the realm of your experience.)
 
Yes, it makes perfect sense, now. I feel like a bloody idiot.
 

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