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Why do we have different units for the same physical quantity ?

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The value of any given physical quantity may vary over a wide range, so that, different units for same physical quantity are required. E.g. : Speed of a cycle can be measured in m/s, speed of a car can be measured in km/h and speed of a satellite can be measured in km/s.
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  1. Why do we have different units for the same physical quantity ?

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