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Consider the two statements: (1) The car left town and traveled 50 km. (2) The car left town and traveled 50 km NORTH.

In the first statement we are merely talking about the distance traveled We do not know which way the car went. This is speed. SPEED is only a magnitude. In the second, we are giving more info by adding the DIRECTION in which the car traveled. This is VELOCITY. VELOCITY gives speed together with DIRECTION. You can see that VELOCITY is more informative than SPEED. In everyday life, people in the streets use the two terms interchangeably, but in science and engineering the distinction is important.

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