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60 bytes added ,  17:53, 2 October 2012
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Can you derive this?
 
Can you derive this?
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[[Image:Gravitation%20for%20wiki_html_m290004f7.gif]] <br>
    
G m1 Ms / r12 = m1 (v12)/ r1
 
G m1 Ms / r12 = m1 (v12)/ r1
3,913

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