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

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3.5 km/s

7 km/s

72 km/s

14 km/s

answer is A.

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Detailed Solution

v∝1r. If orbital radius becomes 4 times then orbital velocity will become half. i.e. 72=3.5 km/s

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