1. The problem statement, all variables and given/known data Preliminary questions: 1. John's weight is 618 N. He is sitting on a bosun's chair which is suspended from a spring. John's feet are pressing vertically down on a bathroom scale which reads 45 kg. What force is John exerting on the bathroom scale? Correct, computer gets: 441 N 2. What force is John applying to the spring? Correct, computer gets: 177 N The spring task: Here is a table of the force applied to a spring and the resulting extension, Δl. Force (N) Δl (m) 281 0.10 358 0.15 685 0.30 1012 0.45 1089 0.50 Plot a graph of Force vs. Δl. What is the spring constant? If you don't plot a graph (or use a fitting program), you will get wrong answers. Plot the graph and see why. 2. Relevant equations Not sure. 3. The attempt at a solution I've plotted a graph, and came up with Δl = 0.4. Then I devided 177 N by 0.4, but the resulting answer wasn't correct.