9. Rotational Kinetic Energy(P254-255) K=-lo 力矩的功W=Md6 work-kinetic energy theorem for rigid bod rotated about a fixed axis. W 今~1=4 Where=J。zd the work done on a rigid body during a finite angular displacement equals to the change of its rotational kinetic energy.. 2 1 2 K = I 9. Rotational Kinetic Energy (P254-255)  = 2 1 d   力矩的功 W M  W = I f − I i = K 2 2 2 1 2 1    = f i W d   where   work-kinetic energy theorem for rigid body rotated about a fixed axis: —– the work done on a rigid body during a finite angular displacement equals to the change of its rotational kinetic energy