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Two solid spherical planets have equal r...

Two solid spherical planets have equal radii and mass of 4M and 9M and distance between their centre is 6R. A body of mass m is projected toward heavy planet, then what should be the ditsance of body of mass m from lighter planet so that the gravitational force on it will be zero ?

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The correct Answer is:
r = 2.4 R from planet of mass 4M
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