A object is dropped from a height of 5.29 X 10^6 m above the surface of the Earth. What is its initial acceleration. The acceleration of gravity is 9.81 m/s^2 and the radius of the earth is 6.37 X 10^6 m. Answer in units of m/s^2. So my problem is that I was sick today and missed the class. I can't find any problem like this in my book and my friends have no idea how to solve it either. I thought of possibly using the fact that mg=G(m1 X m2)/D^2 but that didn't help me since I am not given the mass of the object or the mass of the Earth. The only other equations I have deal with orbits, and I do not see how they would apply in this problem. I have no equation that deals with acceleration like this. (I thought about possibly using a "big four" equation, but the acceleration is not constant, so there went that possibly solving method out the window with my sanity.) If anyone has any idea how to even approach this problem my entire physics class will be in your debt.