Who was the first one proved that acceleration due to gravity is approximately 9.8 m/s^2?
What does the plus and minus mean in this acceleration due to gravity answer: [math]g = 9.93 \pm 0.08 \, \mathrm m \, \mathrm s^{-2}[/math]? It’s from the equation [math]s=uv+\frac 12 gt^2[/math] (free fall)?