Tom N. answered • 04/29/19

Strong proficiency in elementary and advanced mathematics

Use the equation for gravitational force F=GmM/r^{2} where m is the mass of the object, is the mass of the earth, r is the radius of the earth. Let mg = GmM/ (r+h)^{2} where h is the height from which the object is to be dropped.

Then g = GM/(r+h)^{2} and solve for h where g = .92g (r+h)^{2} =GM/.92g and h =√(GM/.92g) -r plug in the values for G,M,r and g and solve for h.