if a father weights 80 kg in earth then what will be his weight in mars
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Weight is not measured in Kg. It is measured in Newtons. Mass is measured in Kg and is a measure of the amount of inertia (or resistance to being pushed or pulled) that is a fundamental property of each object. Weight is a force and is dependent on the local value for the gravitational acceleration and changes as that value changes.
If a person has a mass of 80kg, then they will weigh 80kg x 9.8m/s^2 or 784 Newtons on the Earth.
That same person would weigh 80kg x 9.8m/s^2/3 or 261.33 Newtons on Mars, which the person might think was 26.66 Kg (although he would be incorrect since his mass has not changed).
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Answer:
in earth it will 80 kg in mars it will be 80 kg of course
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