JEE Main Physics question
Two spherical bodies of mass and and radii and respectively are released in free space with initial separation between their centres equal to . If they attract each other due to gravitational force only, then the distance covered by the smaller body just before collision is
Answer: (C)
Solution
They collide when their centres are apart, so together they must close a distance . Since no external force acts, the centre of mass stays fixed, so the displacements are inversely proportional to the masses:
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