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Two solid spherical planets of equal rad...

Two solid spherical planets of equal radii `R` have masses `4 M` and `9 M`. Their centres are scparated by a distance `6 R`. A projectile of mass `m` is sent from the planet of mass `4 M` towards the heavier planet. If the distance `r` of the point from the lighter planet where the gravitational 'force on the projectile is zero is `k R`, then calculate `k`.

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