Well, for one thing, the Earth isn't made of chocolate in a thin candy shell.
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At the Earth's surface, the acceleration due to gravity is 9.8 m/s2.
Earth's velocity through space is 297,800 m/s
4×107 m which is 40000000 m. 12.7x10^6. Or 12700 km
9.80665 m/s^2 Depending on where you are on the earth's surface the acceleration of gravity can vary by about 0.1 m/s^2. The average on earth though is taken to be 9.80665, in physics calculations 9.81 m/s^2, 9.8 m/s^2, or even 10 m/s^2 are often used. Note: 10 m/s^2 is actually a fairly good approximation and can speed up calculations significantly.
meters grams like K H D M D C M m is meters the unit rate for measuring the unit rate is like the middle value