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Mechanics 2 - Energy Work and Power Question - HELP! watch

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    Hi guys,

    I'm really quite confused at this question I've just done on Jan 2013 Mechanics paper.

    The paper is available to download here: http://tinyurl.com/m93d388.
    And the question I don't understand is: 2ii.

    What I don't understand is why you take away the total work done away from the GPE?

    If someone could shine some light on this for me I'd highly appreciate it!
 
 
 

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