1. The problem statement, all variables and given/known data The left end of a spring is attached to a wall. When bob pulls on the right end with 200N force, he stretches the spring by 20cm. The same spring is then used for tug of war between bob and Carlos. Each pulls on the spring with a 200N force. How far does Carlos's end of the spring move? explain 3. The attempt at a solution If I think of this as the spring hanging in a gravitational field. I put a weight on it that was 200 N it will pull it down 20cm. but if my spring is hanging on a nail, that is also providing a force of 200N in the opposite direction. So i think that the spring will be stretched still by 20cm. Although I am not sure if it will be stretched by 10cm at Carloss's end or zero.