What is the gravitational potential energy of a 1.02 kg book on the top of a 2.0 m locker?

The gravitational potential energy of an object can be calculated using the formula PE = mgh, where m is the mass of the object (1.02 kg), g is the acceleration due to gravity (9.81 m/s^2), and h is the height (2.0 m). Plugging in the values, we get PE = 1.02 kg * 9.81 m/s^2 * 2.0 m = 20.0844 J. So, the gravitational potential energy of the book on top of the locker is approximately 20.08 Joules.