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At a playground, a 19 child plays on a slide that drops through a height of 2.5 . The child starts at rest at the top of the slide. On the way down, the slide does a nonconservative work of -366 on the child. What is the child's speed at the bottom of the slide?

I know how to do the problem.... The only thing that is throwing me off is the "nonconservative force." Can someone explain what that is and how to utilize it? Do I just subtract that from the total work done? thanks!