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 :
Answer & explanation
Correct answer: option 2
Work done = \(U_{final} - U_{initial}\)
= \(U_{\infty} - U_R\)
= \(0 - (\frac{-GMm}{R})\)
=\(\frac{GMm}{R}\)
= \(\frac{GM}{R}\) ... [As mass m = 1 kg]