First slide
Concept of potential energy
Question

If g is the acceleration due to gravity on the earth's surface, the gain in the potential energy of an object of mass m  raised from the surface of earth to a height equal to the radius of the earth R, is

Moderate
Solution

Gain in potential energy  ΔU=mgh1+hR
If h=R then ΔU=mgR1+RR=12mgR

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