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Orbital velocity of earth’s satellite near the surface is 7 kms^–1. When the radius of orbit is 4 times that of earth’s radius

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Orbital velocity of earth’s satellite near the surface is 7 kms–1. When the radius of orbit is 4 times that of earth’s radius, then orbital velocity in that orbit is = ……….. kms–1 

(A) 3.5 

(B) 17 

(C) 14 

(D) 35

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1 Answer

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Best answer

Correct option: (A) 3.5

Explanation:

V ∝ (1 / √r)

(V2 / V1) = √(r1 / r2)

V2 = V1 × √(r1 / r2)

∴ V2 = 7 × √(r1 / 4r1)

V2 = 3.5 km/s   

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