A uniform rod mass `m` and length `L` is free to rotate about hinge `O`. A slight disturbance cause the rod to rotate freely about `O` and it strikes the ground.
Velocity with which the non-hinged end of rod strikes the surface is:
A. `sqrt(2gL)`
B. `sqrt(3gL)`
C. `sqrt(6gL)`
D. `sqrt(gL`