A student performs two experiments. In both, he pulls with a force of 45 N on an ideal rope that is attached to an ideal spring (k = 80 N/m) that is attached to another ideal rope. In the 1st, the rope he is not pulling on is attached to a wall. In the 2nd, another student holds the loose end and pulls with 45 N of force. How much does the spring stretch in the 1st experiment, and using a F-B diagram, how much does the second experiment's stretch compare to the first?

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