My answer is 5 kg. Do you know? Weight is a synonym of Mass.
Additional answer
Mass and weight are the same thing on Earth, but they are not when there's a change of gravity, and the words are not synonyms. If you go to the Moon your mass will not change, but you will weigh less. And in outer space you will weigh nothing but your mass will still be the same.
It's important to realise this because if you wanted to calculate how much thrust to use to change the speed or direction of a space vehicle, the mass of that vehicle would be a very important part of the calculation, even though it's weightless.
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The mass of a potato is certainly more than 5 g and definitely less than 5 kg.
On earth, 5 kg of mass weighs 49 newtons (11 pounds) at sea level. Less as rises above or sinks below the surface.
W = mg, where W is weight in Newtons, m is mass in kg and g is acceleration due to gravity, 9.8m/s2.W = 5kg x 9.8m/s2 = 49N = 50N rounded to 1 significant figure
The Earth weight of a particular substance in newtons is the product of its mass (in kg) and 9.8 meters per second per second, following this conclusion we shall get the mass of a substance if we divide its weight by 9.8 . Therefore applying this theory the mass of the book must or would be 0.51 kg.
Since kilograms is a measure of mass and weight is a force, we need to use the relation F=MA to determine the amount of weight exerted by 5 kg of mass. On Earth, gravitational accleration is roughly constant because most points on the surface are about the same distance from the Earth's center of gravity (The earth is a sphere). This acceleration is approximately 9.8 m/s². Multiplying mass (5 kg) and acceleration (9.8 m/s²), we get 9.8*5=49, and our units are kg*m/s², also known as Newtons (N), which is the metric unit of weight. Answer: 49 N