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GRAVITATIONAL ACCELERATION


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The space shuttle orbits 300 km above Earth surface , that has radius 6400 km . What is the gravitational acceleration experienced by the space shuttle ? Answer is 8.9 m/s^2 . 

I'm trying to equal mv ^2 / r = mMG/r^2 , where v^2/r is "a", so that I get a= mMG/r .. and I put r= 6400+300 but it isn't correct.. 

just a hint would be great , thank you in advance!

 

Edited by Sara Taboni Miller
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