1. The problem statement, all variables and given/known data an object of mass 750 kg is lifted from the earth's surface to a height of 6.8 x 10^6 m above its surface. Calculate the change in gravitational potential energy for the object. 3. The attempt at a solution I used this formula ΔEg = Eg2 - Eg1 ΔEg = -(GMm/r2) - (-GMm/r1) Eg2 = -(GMm/r2) Eg2 = -(6.67x10^-11 Nm^2/kg^2)(5.98 x10^24kg)(750kg)/(6.8x10^6m)+(6.37x10^6m) Eg2 = -2.27 x 10^10 J Eg1 = -(GMm/r1) Eg1 = -(6.67x10^-11 Nm^2/kg^2)(5.98 x10^24kg)(750kg)/(6.37x10^6m) Eg1 = -4.7x 10^10 J ΔEg = Eg2 - Eg1 ΔEg = -2.27 x 10^10 J + 4.7x 10^10 J ΔEg = 2.43 x 10^10 J Is my process correct?