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http://img136.imageshack.us/img136/6353/mechanicsau9.jpg [Broken]

I have this question for my WebAssign and im not sure what to do with it. I thoght about how to use the X1 and X2 to get delta r but I really have no idea where to start. Please help! Much appreciated

I have this question for my WebAssign and im not sure what to do with it. I thoght about how to use the X1 and X2 to get delta r but I really have no idea where to start. Please help! Much appreciated

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