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As I understand it there are two different words for "how fast an object is moving" in English:
velocity, tells you how the x,y,z (in 3 dimensions) coordinates of an object change over time. It's a vector quantity, hence has direction and magnitude. For example
speed, tells you how fast the object covers distance. It's a scalar quantity with no direction. For example
Do you distinguish between the vector / scalar quantity in German too? I only know the word "Geschwindigkeit" and I think it's used in both cases. Is there another word that only describes either "speed" or "velocity"?