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Q.

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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a

1 km/sec

b

4 km/sec

c

8 km/sec

d

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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