Aperson places an object on the shelves. 1. at which location on the shelves (w, x, y, or z) would the object have the most gravitational potential energy? explain your answer. a book with a mass of 0.21 kg is placed at location x. a magazine with a mass of 0.11 kg is placed at location y. 2. does the book or the magazine have more potential energy? show your calculations and include units in your answer. a 2.5 kg object is placed at location x where it has 10 j of potential energy. a person bumps the shelf, causing the object to fall to the ground. 3. assuming air resistance is negligible, explain how conservation of energy is demonstrated as the object falls to the ground. 4. calculate the speed of the 2.5 kg object just before it hits the ground. show your calculations and include units in your answer.