The change in the P.E., when a body of mass m is displaced from Earth's surface to a vertical height equal to radius of earth (g = acceleration due to gravity on earth surface) is:
mgR2
2mgR3
mgR3
3mgR4
A
mgR2
B
2mgR3
C
3mgR4
D
mgR3
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Solution
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ΔPE=GMmR{1−12}=GMm2R gR=GMR ΔPE=mgR2
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