We can confirm that Dylan was pushing back with a force of at least 221N, and it would take 18 students to push Dylan if she was withstanding 300N.
This has to do with the force being applied by each student. The question states that the students were each applying a force of 17 N , and Dylan will be withstanding 300, so we can divide these numbers and round up to arrive at the number of students needed, which equates to 18 students.
Therefore, we can confirm that Dylan was pushing back with a force of at least 221N, and it would take 18 students to push Dylan if she was withstanding 300N.
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