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25. Orbital velocity of earth’s satellite near the surface is 7 km/s. When the radius of the orbit is 4 times than that of earth’s radius, then orbital velocity in that orbit is

(a)      3.5 km/s                           (b)  7 km/s

(c)   72 km/s                             (d)  14 km/s

Answer: a

(14)

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