66 Two uniform solid spheres of equal radii R,but mass M and 4M have a centre to centre are held - Physics - Gravitation

Question

66 Two uniform solid spheres of equal radii R,but mass M and 4M
have a centre to centre are held fixed on a horizontal floor A
projectile of mass m is projected from the surface of the sphere of
mass M directly towards the centre of the second sphere obtain an
expression for the minimum speed v of the projectile so that it
reaches the surface of the second sphere

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