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
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On the earth, any mass of 5 kg weighs 49 newtons(11 pounds).On the moon, the same mass weighs 8 newtons (1.8 pounds).
to get weight multiply by acceleration of gravity which is 9.81 m/s/s. 5 x 9.81 = 49.05 kgm/s/s = 49.05 Newtons
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.
On earth, 5 kg of mass weighs 49 newtons (11 pounds) at sea level. Less as rises above or sinks below the surface.
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