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I correctly found the impulse by determining the area underneath the curve. It's 7 N s. I know that we can determine the final velocity by using this equation: I=m∆v. I also saw a topic somewhere on this site where someone suggested the same formula. I used this formula and I get the wrong answer.

7 = .583(vf - 0) vf = 13.011m/s

I also tried inputting -13.011m/s and that was also incorrect. I don't know where I'm going wrong.