Three identical metal balls, each of radius \( \mathrm{r} \), are P placed touching each other o...

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Three identical metal balls, each of radius \( \mathrm{r} \), are
P placed touching each other on a horizontal surface

W such that an equilateral triangle is formed when the centres of the three balls are joined. The centre of mass of the system is located at:-
(1) horizontal surface
(2) centre of one of the balls
(3) line joining centres of any two balls
(4) point of intersection of their medians
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