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 A rocket is fired vertically with a speed of 5 kms-1 from the earth’s surface. How far from the earth does the rocket go before returning to the earth ? Mass of the earth = 6.0 ×1024kg; mean radius of the earth = 6.4 ×106m; G= 6.67 ×10-11N m2kg-2  

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(a) 8.0 ×106 m (b) 8.0 ×107 m (c) 8.0 ×109 km (d) 8.0 ×106 km 

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The correct option is  (a) 8.0 ×106 m

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