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[" 65.A man weighs "80kg" on the surface...

[" 65.A man weighs "80kg" on the surface of earth of radius "R" .A "],[" what height above the surface of earth his weight willy "],[40kg" ? "],[" a."(R)/(2)],[" c."(sqrt(2)-1)Rquad " b."sqrt(2)R],[" 6.The gravitational potential energy of an isolated system "]

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