The least velocity required to throw a body away from the surface of a planet so that it may not return is (radius of the planet is 6.4×106m, g=9.8 m/sec2)

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9.8×10−3m/sec

12.8×103m/sec

9.8×103m/sec

11.2×103m/sec

answer is D.

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Detailed Solution

Escape velocity from surface of earth ve=2gR=2×9.8×6.4×106=11.2×103 m/s

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