Physics Help

[Nimmy]

The Earth has radius of 6,400 km. A satelite orbits the Earth at a distance of 12,800 km from the center of the Earth. If the weight of the satelite on Earth is 100 Kilonewtons, the gravitaional force on the satelite in orbit is

(A) 11 kilonewtons
(B) 25 kilonewtons
(C) 50 kilonewtons
(D) 100 kilonewtons
(E) 200 kilonewtons

[quasar987]

What do you think? What is the expression of the gravitationnal force?

[eutopia]

F = (Gm1m2)/r^2

u have all the variables

mass of the earth is 5.98x10^24 kg