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**Review problem for classical, help please!!!**

**Hi I just started my classical mechanics class, and I was given this: a bunch of problems (image attached) (and one that I pulled from the notes I didnt know how to do as well.) that I could do for practice to refresh for the class, problem is I have no clue where and how to do any of these problems! I'm lost and this is the reivew :-( could anyone please help me figure out how to do these, I need to make sure i know how these are done for my quiz which i'm told is similar to these types of probelms or at least if I know how to do these I will be fine this friday.**

A) Given ((mdx^2)/(dt^2))=F(x)

prove conservation of energy

A) Given ((mdx^2)/(dt^2))=F(x)

prove conservation of energy