state universal law of gravitation. explain significance . masof a number is 20 kg. find its weight on Earth and on moon ( gravity of moon is 1.6 m/ s2)
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The force is along the line joining the centres of two objects . after solving we get, g= 9.8 m/s² , where G is universal gravitational constant, M is mass of earth and r is the radius of earth. weight of body on moon is one - sixth of weight of body on earth.
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