You find your mass to be 42 kg on a weighing machine. Is your mass more or less than 42 kg?
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As we know that the mass of an object is constant throughout the universe, if the object is at rest or moving with an ordinary speed. So if its mass is 42kg when it is weighed its mass is exactly 42 kg neither more nor less than that.
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Even gases like air exert an upward force on the objects placed in them. Now, when we stand on a weighting machine, then the air exerts an upward force on our body and makes us slightly lighter than we actually are. So, if weoghting machine shows our mass to be 42 kg, then our actual mass will be slightly more than 42 kg.
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