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According to the universal law of gravitation,gravitational force exerted on an object of mass m is given by Where, Mass of Earth, M = 6 x 10 24 kg Mass of object, m = 1 kg Universal gravitational constant, G = 67 x 10 11 Nm 2 kg 2 Since the object is on the surface of the Earth, r = radius of the Earth (R) r= R = 64 x 106 mUniversal gravitational constant, G = 67 × 10 −11 Nm 2 kg −2 Since the object is on the surface of the Earth, r = radius of the Earth (R) r = R = 64 × 10 6 mThe formula of gravitation can be stated as F = G * (m1*m2)/R2 In this gravitational force equation F → Magnitude of the gravitational force G → It is the gravitational constant and its size depends on the system of units used m1, m2 → Masses of the two objects R Distance between the masses Cbse Class 9 Science Chapter Gravitation Notes Part I Gravitational constant formula class 9