Two uniform solid spheres of equal radii R, but mass M and 4M have a centre to centre separation of 6R. A projectile of mass m is projected from the surface of the sphere of mass M directly towards the centre of the second sphere.
WHAT would be its VELOCITY AFTER REACHING THE SURFACE OF THE SECOND SPHERE having mass 4M ??
**PLEASE READ THE QUESTION CAREFULLY AS THE LAST PART IS A BIT DOFFERENT FROM THE TEXTBOOK EXAMPLE**
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By conservation of energy
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