1. Mark the position of the end of the spring when it is empty. You will measure the stretching of the string from this position.
2. Suspend the weight hanger on the spring, record its mass, and read the spring extension x_0. Write down your values in table 1.
3. Add 0.5 kg to he hanger, record the new total weight and read the corresponding spring displacement. Repeat this step and fill table 1.