A thin rod of length l and mass m has a disc attached to one of its end such that rod and disc are coplanar. Mass of the disc is M and radius is r. C.M. from the cenre of disc is

Options

A. `(lM)/(2(m+M))`
B. `(lmM)/(2(M+m))`
C. `(lm)/(M+m)`
D. `(lm)/(2(M+m))`

Answer

D

Explanation

Here `x_(CM)=(Mx_(0)+ml//2)/(m+M)=(lm)/(2(M+m))`