The speed of a satellite that revolves around earth at a height 3R from earth's surface is (g=10m/s2 at the surface of earth, radius of earth R=6400 km)
4 km s−1
8 km s−1
2√2 km s−1
4√2 km s−1
A
2√2 km s−1
B
4 km s−1
C
4√2 km s−1
D
8 km s−1
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