Gravitation Question 126

Question: If mass of earth is M, radius is R and gravitational constant is G, then work done to take 1 kg mass from earth surface to infinity will be [RPET 1997]

Options:

A) [GM2R]

B) [GMR]

C) [2GMR]

D) [GM2R]

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Answer:

Correct Answer: B

Solution:

Potential energy of the 1 kg mass which is placed at the earth surface = [GMR] its potential energy at infinite = 0 Work done = change in potential energy = [GMR]



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