Force of gravity from different heights

[IceIsFun]

How do I find the difference in gravity pull on a object dropped from 1km, 10km and 100km based on the objects mass (such as Earth vs the moon)

e: Don't care about drag

 

[TimGrebin]

You can use the equation:

F = (-G x m1 x m2) / r^2

F is Force
G is Gravitational constant (6.7x10^-11) (Make it negative to show attraction)
m1 is the mass in kg of an object
m2 is the mass in kg of another object
r is the radius or the distance in meters between the objects.

Hope this helps!