g=(G*M)/r²
g-acceleration due the gravity, g=?
G-the universal gravitational constant, G=6.673x10^(-11)N*m²/kg²
M-the mass of the earth, M=5.98x10^(24)kg
r-the radius of the earth, r=6370km=6370000m
g=(6.673x10^(-11)N*m²/kg²)*(5.98x10^(24)kg)/(6370000m)²
g=9.834m/s²