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An object is orbiting earth at a height of $100$ $km$ from the surface. What's the period in $seconds$?

Gravitational Constant, $G=6.673\times10^{-11}$ $Nm^2kg^{-2}$
Mass of the Earth, $M_e = 6\times 10^{24}$ $kg$
Radius of the Earth, $R=6400$ $km$

Hint: Do you know Kepler's third law?

Astrophysics

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