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try it gravitation
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Don't apply the approximation at the start. Get the complete ratio, then apply h<<R. The required ratio g0(1-h/R) / g0/(1+h/R)2 = (1-h/R) (1+h/R)2 = (1-(h/R)2 ) (1+h/R) As h<<R, (h/R)2<<1 So the required ratio is  (1+h/R)Hence linear variation |
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