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The distance between centre of the earth and moon is 384000 km. If the mass of the earth is 6

The distance between centre of the earth and moon is 384000 km. If the mass of the earth is 6 ×1024 kg  and G = 6.66 × 10-11Nm2/kg2. The speed of the moon is nearly

(a)  1 km/sec                            (b)  4 km/sec

(c)   8 km/sec                            (d)  11.2 km/sec

Answer: a

(39)

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