Dr Gulshan S. answered 11/13/21
Physics Teaching is my EXPERTISE with assured improvement
Center of mass of first brick is x1 = L/4
center of mass of second brick is X2 = L/2 + L/8
centrr mass of third brick X3= L/2+ L/4 + L/2
Xcm of three bricks = M( L/4 + L/2+ L/8+ L/2+L/4 + L/2 )/3M
Formula used
Xcm= (m1x1 + m2 x2+ m3 x3)/ (m1 +m2+m3)
Here M = mass of each brick = m1= m2 = m3