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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
P surface of earth. If earth's radius is \( 6.38 \times 10^{6} \mathrm{~m} \) and

WV \( g=9.8 \mathrm{~m} \mathrm{~s}^{-2} \), then the orbital speed of the satellite is
(a) \( 9.13 \mathrm{~km} \mathrm{~s}^{-1} \)
(b) \( 6.67 \mathrm{~km} \mathrm{~s}^{-1} \)
(c) \( 7.76 \mathrm{~km} \mathrm{~s}^{-1} \)
(d) \( 8.56 \mathrm{~km} \mathrm{~s}^{-1} \)
\( (2015) \)
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