91. The total kinetic energy of a body of mass 10 kg and radius 0.5 m moving with a velocity of 2 m/s without slipping is 32.8 joule. The radius of gyration of the body is

(a)           0.25 m (b)          0.2 m      (c)           0.5 m (d)          0.4 m Ans. d (39)