The potential energy, in Joules, of an object is described by the formula P.E. = mgh, where m = mass in kg, g = acceleration due to gravity in m/s2, and h = altitude in meters. Find the height above sea level of a 60 kg object with a potential energy equal to 4 × 106 Joules. Assume g = 10 m/s2. Round answer to the nearest meter.