The distance between centre of the earth and moon is 384000 km. If the mass of the earth is 6×1024kg and G=6.66×10−11Nm2/kg2. The speed of the moon is nearly

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1 km/sec

4 km/sec

8 km/sec

11.2 km/sec

answer is A.

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Detailed Solution

v=GMr=6.67×10−11×6×1024384000×103=1 km/s

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