1. At what height is an object that has a mass of 45 kg, if its gravitational potential energy is 9500 1? Given Unknown Solution Final Answer 2. A 20 kg mass is lifted to a height of 5 m. What is its potential energy at this position? Given Unknown Solution Final Answer3. What is the potential energy of a 500 g book on top of a 10 m shelf? Given Unknown Solution Final Answer 4. A 75,000 g refrigerator is located on the 70th floor of a skyscraper (300m above ground). What is the potential energy of the refrigerator? Given Unknown Solution Final Answer5. The potential energy of an apple is 6.0 joules. The apple is 3m high. What is the mass of the apple? Given Unknown Solution Final