A uniform disc of mass `m` and radius `r` and a point mass `m` are arranged as shown in the figure. The acceleration of point mass is `: (` Assume there is no slipping between pulley and thread and the disc can rotate smoothly about a fixed horizontal axis passing through its centre and perpendicular to its plane `)`

Options

A. `(g)/(2)`
B. `(g)/(3)`
C. `(2g)/(3)`
D. none of these

Answer

C