9. If a weight has 500 J of potential energy when it is at height, how much kinetic energy would it have just as it hit the ground? 10. The same weight as in #9, how much kinetic energy would it have halfway to the ground? How much potential energy?

9. If the weight has 500 J of potential energy at its initial height, it will have **500 J of kinetic energy** just as it hits the ground. This is due to the conservation of energy. Assuming no energy is lost to air resistance or other forces, all the potential energy is converted into kinetic energy as the weight falls.<br /><br />10. Halfway to the ground, the weight will have converted half of its potential energy into kinetic energy. Therefore, it will have **250 J of kinetic energy**. Since total energy remains constant, it will also have **250 J of potential energy** remaining.<br />