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At what height above the surface of the ...

At what height above the surface of the earth is the gravitational potential energy of a body equal to that on the surface of the moon ? Assume that the mass of the earth is 80 times that of the moon and the radius of the earth is 4 times that of the moon. Given ,Radius of the earth =6400 km.

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MODERN PUBLICATION-GRAVITATION-EXAMPLE
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  12. What do you mean by acceleration due to gravity?

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