Gravity inside Earth Model  

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position_of_object(t) = position_of_object(t - dt) + 
                        (change_in_position) * dt 
INIT position_of_object = radius_of_the_Earth 
change_in_position = velocity_of_object 

velocity_of_object(t) = velocity_of_object(t - dt) + 
                        (change_in_velocity) * dt 
INIT velocity_of_object = 0 
change_in_velocity = acceleration 

acceleration = -force_on_object/mass_object 
force_on_object = 6.67e-11*mass_Earth*mass_object*
                  position_of_object/ (radius_of_the_Earth^3) 

mass_Earth = 6e24 
mass_object = 1 
radius_of_the_Earth = 6.4e6 

Time Specs:Duration 0-10000, dT=1
Integration Method = Runge-Kutta 2 
Time Specs Settings
Range: 0-10000; dt = 1; Integration Method = Runge-Kutta 2



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