Why the unit of mass is taken in kg;weight in N? I'm confused with their units

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Solution

Mass is a fundamental quantity. It is a meaure of the amount of matter contained in an object. Its unit is Kg.
Weight is a force. Weight of any object is the force [force of gravity] with which earth pulls any object towards its centre. This is the reason why objects fall down when they are thown up. Since, weight is a force, its unit is Newton.

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