PM P(t=@t+k pQm cos a2t do( o( 0-MQ sin @t dt AOm △=Mg=kV9 Or UM=V cos(ot+M cos QtPM： c p Ωm   ( ) cos t t k V = + Ωt pM cm c p v =  V t M t cos( cos )  ＋ M k V p p = Ωm c p d ( ) ( ) sin d t t M t t    = = − Ω Ω  =  =  m p p M k VΩm