A satellite with kinetic energy E_k is revolving round the earth in a circular orbit. How much more kinetic energy should the given to it so that it may just escape into outer space

Q: A satellite with kinetic energy Ek is revolving round the earth in a circular orbit. How much more kinetic energy should the given to it so that it may just escape into outer space

(a) $ E_k$

(b) $ 2 E_k$

(c) $ \frac{1}{2} E_k$

(d) $ 3 E_k$

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Ans: (c)