Following Questions of a paragraph has only one correct answer among the four choices(A), (B), (C) and (D).

A small block of mass 1 kg is released from rest at the top of a rough track. The track is a circular arc of radius 40 m. The block slides along the track without toppling and frictional force acts on it in the direction opposite to the instantaneous velocity. The work done in over coming the friction up to the point O, as shown in the figure below, is 150 J. (Take the acceleration due to gravity, g = 10m $$s^{-2}$$).