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Weight is the mass of an object times the gravitational acceleration it undergoes. The gravitational acceleration of Earth is approximately 9.8 m/s^2. So in this case 70/9.8 = 7.14 kg

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Q: What is the mass of a book that weighs 70N?
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Calculate the upthrust on a body which weighs 100N in air and appears to weigh 70N in H20.?

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