A body of mass m is lifted up from the surface of the earth to a height three times the radius of the earth. The change in potential energy of the body is (where g is acceleration due to gravity at th

Question

A body of mass m is lifted up from the surface of the earth to a height three times the radius of the earth. The change in potential energy of the body is (where g is acceleration due to gravity at the surface of earth.)

TestHub · Accepted Answer

The change in potential energy is Δ U = 1 + h / R m g h ​ . Here h = 3 R , so Δ U = 1 + 3 R / R m g ( 3 R ) ​ = 4 3 m g R ​ .

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