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A satellite with kinetic energy

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

(a)    Ek                                   (b)  2 Ek

(c)   1/2 Ek                                  (d)  3 Ek

Answer: a

 

(9)

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