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The Lambeau Leap is a beloved tradition for Green Bay Packer fans in which a player, upon scoring a touchdown, runs through the endzone and jumps up into the stands to be congratulated by his rabid fan base.  Initially concieved by Leroy Butler in 1993, the practice has been going strong for almost two decades.     By now, you may have become so inclined as to wonder exactly how much energy it would take for Desmond Bishop ( pictured above ) to catapult himself up and over a six-and-a-half-foot wall. Amazingly enough this is a relatively simple calculation when utilizing the law of conservation of mechanical energy, which states that in an isolated system the total mechanical energy is always conserved.     In this case Desmond Bishop is about to apply enough of a force against the Earth to provide himself a kinetic energy in the upwards direction that will be converted into potential energy at the top of his leap. Since we know that the total amount of energy within the system cannot change, and we know that Bishop's kinetic energy at the top of his leap is zero due to his velocity being zero, then all of his kinetic energy has turned into potential energy.  Therefore, if we can find his potential energy at the top, then we will know his kinetic energy at the bottom.  Fortunately for us, potential energy is very easy to calculate.    The potential energy of an object is its mass times gravity times its change in height.  For Mr. Bishop, who's center-of-mass should be right around his navel,  the change in height would be approximately  three-and-a-half feet or 1.07 meters. His mass is 107.9 kg.  Therefore his kinetic energy at the commencement of the leap is his potential energy at the apex of his leap which is: 107.9 kg X 9.81 m/s/s X 1.07 m  =  1,132.6 Joules