Consider that the moon’s mass is M. As a result, the earth’s mass is 81M. The radius of the earth is R once more.
The mass of the earth is 81 times the mass of the Moon and the distance between the earth and the Moon is 60 times the radius of earth. If R is the radius of the earth, then the distance between the Moon and the point on the line joining the Moon and the earth where the gravitational force becomes zero is
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Principal, Babu Daudayal SVM, Mathura