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Weight = mass x gravity Weight = 50Kg x 9,8 m/s^2 = 490.0 Newtons
This is not a valid conversion; milligrams (mg) and grams (g) are measures of weight or mass and mL (milliliters) is a measure of volume.
density = mass/volume 78/29 = 2.69 g/ml
"Kilogram" is not a unit of weight. It's reasonable to expect that a cat might have a mass of four kilograms.
Eight tenths of a pond, presumably. It is not possible to be more precise without knowing if it is pound (money) or pound (mass).