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What is the escape speed for an object i...

What is the escape speed for an object in the same orbit as that of Earth around sun (Take orbital radius R) but far from the earth? (mass of the sun =`M_(s)`)
(b) If an object already has a speed equal to the earth's orbital what minimum additional speed must it be given to escape as in (a) ? .

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The correct Answer is:
(a)`sqrt((2GM_(s))/(R))`
(b) `(sqrt2-1)sqrt((GM_(s))/(R))` .
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