Three identical metal balls, each of the...

Three identical metal balls, each of the radius r are placed touching each other on a horizontal surface such that an equilateral triangle is formed when centres of three balls are joined. The centre ofthe mass of the system is located at

line joining centres of any two balls

centre of one of the balls

horizontal surface

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The correct Answer is:

Centre of mass of each ball lies on the centre.
`rArr` Centre of mass of combined body will be at the centroid of equilateral triangle.

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