QI For each of the following, is W positive, negative, or zero? A B B A Wis Quick Review of Potential Energy Wis Potential Energy PE is "stored energy". For example, in a spring-loaded gun, as the "bullet" is compressed against the spring, the spring has elastic potential energy relative to its uncompressed state. Once released, the PE of the spring is transferred to KE of the bullet. Another example is holding a book above the ground. The book has gravitational PE relative to the ground. Q2 At what position does a book have more gravitational PE relative to the ground, at a vertical height of 1 m or 2 m?, Explain why in terms of transferring PE to KE.