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22 November, 10:42

What is the mass of a rock that weights 49 newtons?

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  1. 22 November, 13:19
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    Remember that the Weight of any mass is

    Weight = (mass) x (gravity)

    and gravity on Earth is 9.8 m/s².

    Now just fill in the numbers we know:

    49 Newtons = (mass) x (9.8 m/s²)

    49 kg-m/s² = (mass) x (9.8 m/s²)

    Divide each side by (9.8 m/s²), and we have

    mass = (49 kg-m/s²) / (9.8 m/s²)

    mass = (49 kg-m/s²) x (s²/9.8m)

    mass = (49/9.8) x (kg-m-s²/s²-m)

    mass = 5 kg
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