1.

Five uniform circular plates, each of diameter `b` and mass `m` are laid out in a pattern shown. Using the origin shown, find the `y` co-ordinate of the centre of mass of the five-plate system. .A. `2D//5`B. `4D//5`C. `D//3`D. `D//5`

Answer» Correct Answer - B
Ans.(2)
`y_(cm)=(summ_(i)y_(i))/(summ_(i))=(mxx0+mxxD+mxx2D+mxxD+mxx0)/(m+m+m+m+m)=(4D)/(5)`


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