You want to weigh your horse, so you mount a platform to the top of a vertical spring. With the loading of the platform and horse, the spring is 1.54 inches shorter than the unloaded length. Assume that the platform weighs 30 pounds, the spring has a constant of 700 Ibf/in, and that you can train your horse to stand on your platform. How much does your horse weight? How much work is being done on the spring?