You multiply the mass by the gravity. Normal Earth gravity is about 9.8 (in meters/second2, or the equivalent newton/kilogram).
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Weight = (mass) x (local acceleration of gravity). Mass = (weight) / (local acceleration of gravity) If you know the weight and the local acceleration of gravity, you can calculate the mass. Anywhere on or near the surface of the earth, the local acceleration of gravity is about 9.82 meters per second2 . As an example, an object with a weight of 9.82 newtons has a mass of one kilogram.
40kg of mass, 400 (approx) N of weight.
Weight in Newtons Mass in kilograms
8kg is 78.46 Newtons on earth.
Weight = mass x gravity Weight = 50Kg x 9,8 m/s^2 = 490.0 Newtons