The mass of the earth is 5.97 x 1024 kg; the universal gravitational constant has a value of 6.67 x 10 11 m³kg ¹s 2. The distance of a geostationary satellite from the centre of the earth is: O 3.0 × 104 km 4.2 x 107 km O 4.2 x 104 km
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