A ball moves over a fixed track as shown in the figure. From A to B the ball rolls without slipping. If surface B C is frictionless and K_A, K_B and K_C are kinetic energies of the ball at A, B and C respectively, then

Step-by-step solution

In smooth part B C , due to zero torque, angular velocity and hence the rotational kinetic energy remains constant. While moving from B to C translational kinetic energy converts into gravitational energy.