How do you derive #g=(Gm)/r^2# and #V=-(Gm)/r#?
Here you go....
Weight of an object on Earth = Gravitational force exerted on an object by the Earth.
Let us consider a body having mass "m".
g=acceleration due to gravity,
M=Mass of the Earth,
and R=radius of the Earth.
Weight of the body (on Earth)=
Cancel out the