A remote-sensing satellite of earth revolves in a circular orbit at a height of \( 0.25 \times 1...

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A remote-sensing satellite of earth revolves in a circular orbit at a height of \( 0.25 \times 10^{6} \mathrm{~m} \) above the surface of earth. If earth's radius is \( 6.38 \times 10^{6} \mathrm{~m} \) and \( g=9.8 \mathrm{~ms}^{-2} \), then the orbital speed of the satellite is
[AIPMT 2015]
(a) \( 5.86 \mathrm{~km} \mathrm{~s}^{-1} \)
(b) \( 9.13 \mathrm{kms}^{-1} \)
(c) \( 6.67 \mathrm{~km} \mathrm{~s}^{-1} \)
(d) \( 7.76 \mathrm{~km} \mathrm{~s}^{-1} \)
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