A hanging block of mass m' prevents the smaller block of mass m from slipping over a movable triangular block of mass M. All the surface are frictionless and the strings and the pulleys are light. Value of mass m' in terms of m, M and `theta` is

Options

A. `[(m+M)/(cot theta-1)]`
B. `[(m-M)/(cos theta+1)]`
C. `[(m-M)/(cot theta-2)]`
D. `[(m+M)/(cot theta +2)]`

Answer

A