1. The problem statement, all variables and given/known data a trophy being shown off by a careless athlete slips from the athlete's hands and drops on his toe.Choosing floor level as the y=0 point of your coordinate system,estimate the change in gravitational potential energy of the trophy-Earth system as the trophy falls.Repeat the calculation,using the top of the athlete's head as the origin of the coordinate. The trophy has a mass of 2 kg,and the top of a person's toe is about 0.03m above the floor.Also the trophy falls from a height of 0.5m. 2. Relevant equations (? U)=(U final)-(U inetial) 3. The attempt at a solution I'm not sure how to get started as I'm not good in solving equations of energ. I don't know how can I differentiate between potential energy & kinetic energy ??