1. The problem statement, all variables and given/known data A sensitive gravimeter is carried to the top of Chicago’s Willis (formerly Sears) Tower, where its reading for the acceleration of gravity is 1.36 mm/s^2 lower than at street level. Find the building's height, h=? 2. Relevant equations 3. The attempt at a solution I started this problem with this: g - g' = 0.00136 m/s^2 now find the change in potential energy of gravity: GMm/(Radius of earth)^2 - GMm/(Radius of earth + h)^2 using this we should be able to simplify but i am not getting too far from here, it is a bit messy and i am not getting too much to cancel out here...why? can anyone help me out? please and thank you!