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Two solid spherical planets of equal rad...

Two solid spherical planets of equal radii R having masses 4M and 9M their centre are separated by a distance 6R. A projectile of mass m is sent from theplanet of mass 4 M towards the heavier planet. What is the distance r of the point from the lighter planet where the gravitational force on the projectille is zero ?

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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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