A block of mass m is placed on a vertical fixed circular track and then it is given velocity v along the track at position A on track. The coefficient of friction between the block and the track varies with the angle `theta` . If the block moves on track with constant speed then the coefficient of friction is

Options

A. `mu=(sintheta)/(cottheta+(v^(2))/(Rg))`
B. `mu=(sintheta)/(costheta+(v^(2))/(Rg))`
C. `mu=(tantheta)/(costheta+(v^(2))/(Rg))`
D. `mu=(costheta)/(tantheta+(v^(2))/(Rg))`

Answer

B