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A satellite revolves very near to the earth surface. Its speed should be around?

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A satellite revolves very near to the earth surface. Its speed should be around?

(a) 5km/s

(b) 8km/s

(c) 2km/s

(d) 11km/s
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Right option is (b) 8km/s

The explanation is: Near the earth’s surface,

v0=√gR=7.2km/s

Approximately 8km/s.
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