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Two uniform solid spheres of equal radii...

Two uniform solid spheres of equal radii `R`, but mass `M`. and `4 M` have a centre to centre separation `6 R`, as shown in the figure. The two spheres are held fixed. A projectile of mass `m` is projected from the surface of the sphere of mass `M` directly towards the center of the second sphere. If the minimum speed `v` of the projectile so that it reaches the surface of the second sphere is `sqrt((x G M)/(y R))`, then find `(x,+y)`.
'(##CEN_KSR_PHY_JEE_C10_038_Q05##)'

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