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A satellite is revolving in an orbit clo...

A satellite is revolving in an orbit close to the earth’s surface. Taking the radius of the earth as `6.4 x× 10^(6)` metre, the value of the orbital speed and the period of revolution of the satellite will respectively be ( g = `9.8 "meter"//sec^(2)`)

A

7.2 km /sec , 84.6 minutes

B

2.72 km/sec , 84.6 minutes

C

.72 km/sec ., 8.6 minutes

D

7.2 km/sec ., 8.6 minutes

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