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An $80\text{ kg}$ astronaut is moving horizontally at a constant speed of $2\text{ m/s}$. The gravitational field of the planet is $6 \text{ Newtons/kilogram}$. What is the mass of the astronaut?

$80\text{ kilograms}$

$160\text{ Newtons}$

$480\text{ kilograms}$

$480\text{ Newtons}$