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Q.

The orbital speed of an artificial satellite very close to the surface of the earth is  V0. Then the orbital speed of another artificial satellite at a height equal to three times the radius of the earth is

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a

4 Vo

b

2 Vo

c

0.5 Vo

d

3 Vo

answer is C.

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Detailed Solution

v∝1r, If r=R then v=V0 If r=R+h=R+3R=4R then v=V02=0.5V0
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