Hooke s Law In Exercises 5 10 use Hooke s Law to determine the variable force in the spring problem 5 force of 5 pounds compresses a 15 inch spring a total of 3 inches How much work is done in compressing the spring 7 inches 6 A force of 250 newtons stretches a spring 30 centimeters How much work is done in stretching the spring from 20 centimeters to 50 centimeters