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An object will fall 4.9 meters in the first second [d=0.5*g*t^2]. Orbital velocity is 7,700 m/s (both at sea level) [V=(g*m/R)^0.5]. By definition, at orbital velocity the earth falls away at the same rate as you travel. So, 7.7 kilometers from where you are standing the earth has 'dropped away' 4.9 meters. Re-calculating for 1 kilometer: d=0.5*9.8*(1/7.7)^2 = 0.08 meters.
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