[SOLVED] Gravitational Potential Energy 1. The problem statement, all variables and given/known data Calculate the change in potential energy of a 77.2-kg man when he takes an elevator from the first floor to 24th floor, if the distance between floors is 4.05 m. 2. Relevant equations Ug = mgy 3. The attempt at a solution Ug = (77.2kg)*(9.81m/s^2)*(24*4.05m) = 73612.67N*m What am I doing wrong??