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The orbital speed of an artificial satellite very close to the surface of the earth is

The orbital speed of an artificial satellite very close to the surface of the earth is V° . Then the orbital speed of another artificial satellite at a height equal to three times the radius of the earth is

(a)     4  V°                            (b) 2 V°

(c)    0.5 V°                            (d) 4V°

Answer: c

(9)

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