A spaceship is launched into a circular orbit close to the earth’s surface. The additional velocity now to be imparted to the spaceship in the orbit to overcome the gravitational pull is

Q: A spaceship is launched into a circular orbit close to the earth’s surface. The additional velocity now to be imparted to the spaceship in the orbit to overcome the gravitational pull is (in ms-1)

(a) $2 \sqrt{g R}$

(b) $(\sqrt{2}+1 ) \sqrt{g R}$

(c) $ \sqrt{2 g R}$

(d) $(\sqrt{2} -1 ) \sqrt{g R}$

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Ans: (d)