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(a) State Newton’s law of gravitation. Obtain an expression for the gravitational force between two mass bodies.

(b) What is the value of G? Also, write its S.I. unit.

1 Answer

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(a) According to this law, the force of gravitation acting between two bodies is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. The direction of the force is along, the line joining the two masses.

where G is proportionality constant, called universal gravitational constant.

(b) Value of G is 6.67 x 10-11 N-m2/kg2

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