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[" 54.The gravitational potential cneryy...

[" 54.The gravitational potential cneryy of a body at a distance "],[r" from the center of the earth is "U" .The gravitational "],[" force at that point is "],[[" (1) "(U)/(r^(2))," (2) "(U)/(r)," (3) Ur "]],[" 55.If "M" is the mass of sarth and "M" ,is the mass of moon "]

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